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Space saver wheel help...
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JoeJoe
Feb 24, 2022, 2:16:35 PM2/24/22
to
My wife replaced her car last week - a Hyundai i10, 2014.
It had 14" wheels, and came with no spare tyre, so she purchased a space
saver one from the dealer when she bought the car. As it has never been
used, I took it out of the car before she part exchanged it in the hope
of eBaying it for £50 or so, put towards a similar spare for her new car
that also came with none.
Just had a closer look at it before listing, and when I measured the
rim, it is in fact a 16"... Would that have worked when replacing a
14" wheel?
Also, her new car, also an i10, has 16" wheels, but the tyres are low
profile ones, at least an inch narrower than the space saver.
Will she be able to use this one as a spare? Are the lug holes
standard? Both old and new car has/d 4, as does the space saver.
It had 14" wheels, and came with no spare tyre, so she purchased a space
saver one from the dealer when she bought the car. As it has never been
used, I took it out of the car before she part exchanged it in the hope
of eBaying it for £50 or so, put towards a similar spare for her new car
that also came with none.
Just had a closer look at it before listing, and when I measured the
rim, it is in fact a 16"... Would that have worked when replacing a
14" wheel?
Also, her new car, also an i10, has 16" wheels, but the tyres are low
profile ones, at least an inch narrower than the space saver.
Will she be able to use this one as a spare? Are the lug holes
standard? Both old and new car has/d 4, as does the space saver.
alan_m
Feb 24, 2022, 4:05:31 PM2/24/22
to
On 24/02/2022 19:16, JoeJoe wrote:
> My wife replaced her car last week - a Hyundai i10, 2014.
>
> It had 14" wheels, and came with no spare tyre, so she purchased a space
> saver one from the dealer when she bought the car. As it has never been
> used, I took it out of the car before she part exchanged it in the hope
> of eBaying it for £50 or so, put towards a similar spare for her new car
> that also came with none.
>
> Just had a closer look at it before listing, and when I measured the
> rim, it is in fact a 16"... Would that have worked when replacing a
> 14" wheel?
Often different versions of same basic car come with different size
> My wife replaced her car last week - a Hyundai i10, 2014.
>
> It had 14" wheels, and came with no spare tyre, so she purchased a space
> saver one from the dealer when she bought the car. As it has never been
> used, I took it out of the car before she part exchanged it in the hope
> of eBaying it for £50 or so, put towards a similar spare for her new car
> that also came with none.
>
> Just had a closer look at it before listing, and when I measured the
> rim, it is in fact a 16"... Would that have worked when replacing a
> 14" wheel?
wheels. Look up the specification for the base model, the model with
extras as standard and perhaps the sporty version to see the range of
wheel sizes.
>
> Also, her new car, also an i10, has 16" wheels, but the tyres are low
> profile ones, at least an inch narrower than the space saver.
limited speeds.
You will/may also find that the spare tyre of a different size is not
fitted with the tyre pressure sensors and you will/may get a dash
warning the TPMS has detected a fault whilst running with the spare.
--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk
JoeJoe
Feb 24, 2022, 6:38:29 PM2/24/22
to
On 24/02/2022 21:05, alan_m wrote:
> On 24/02/2022 19:16, JoeJoe wrote:
>> My wife replaced her car last week - a Hyundai i10, 2014.
>>
>> It had 14" wheels, and came with no spare tyre, so she purchased a
>> space saver one from the dealer when she bought the car. As it has
>> never been used, I took it out of the car before she part exchanged it
>> in the hope of eBaying it for £50 or so, put towards a similar spare
>> for her new car that also came with none.
>>
>> Just had a closer look at it before listing, and when I measured the
>> rim, it is in fact a 16"... Would that have worked when replacing
>> a 14" wheel?
>
> Often different versions of same basic car come with different size
> wheels. Look up the specification for the base model, the model with
> extras as standard and perhaps the sporty version to see the range of
> wheel sizes.
Thanks, you are correct. The current base model comes with 14" wheels.
> On 24/02/2022 19:16, JoeJoe wrote:
>> My wife replaced her car last week - a Hyundai i10, 2014.
>>
>> It had 14" wheels, and came with no spare tyre, so she purchased a
>> space saver one from the dealer when she bought the car. As it has
>> never been used, I took it out of the car before she part exchanged it
>> in the hope of eBaying it for £50 or so, put towards a similar spare
>> for her new car that also came with none.
>>
>> Just had a closer look at it before listing, and when I measured the
>> rim, it is in fact a 16"... Would that have worked when replacing
>> a 14" wheel?
>
> Often different versions of same basic car come with different size
> wheels. Look up the specification for the base model, the model with
> extras as standard and perhaps the sporty version to see the range of
> wheel sizes.
Hers is the top of the range one and the wheels are 16".
Her old car was also the top of the range at the time, but it had 14"
wheels. Was just wondering why they gave her a 16" space saver wheel for it?
>>
>> Also, her new car, also an i10, has 16" wheels, but the tyres are low
>> profile ones, at least an inch narrower than the space saver.
>
> Space savers are only intended for a get you home/garage type journey at
> limited speeds.
>
> You will/may also find that the spare tyre of a different size is not
> fitted with the tyre pressure sensors and you will/may get a dash
> warning the TPMS has detected a fault whilst running with the spare.
place which is what she is after. It also says to inflate it to 60 PSI
on it - around twice the pressure of the other tyres in her car.
John Miller
Feb 24, 2022, 7:48:15 PM2/24/22
to
On 24/02/2022 23:38, JoeJoe wrote:
> On 24/02/2022 21:05, alan_m wrote:
>> On 24/02/2022 19:16, JoeJoe wrote:
>>> My wife replaced her car last week - a Hyundai i10, 2014.
>>>
>>> It had 14" wheels, and came with no spare tyre, so she purchased a
>>> space saver one from the dealer when she bought the car. As it has
>>> never been used, I took it out of the car before she part exchanged
>>> it in the hope of eBaying it for £50 or so, put towards a similar
>>> spare for her new car that also came with none.
>>>
>>> Just had a closer look at it before listing, and when I measured the
>>> rim, it is in fact a 16"... Would that have worked when replacing
>>> a 14" wheel?
>>
>> Often different versions of same basic car come with different size
>> wheels. Look up the specification for the base model, the model with
>> extras as standard and perhaps the sporty version to see the range of
>> wheel sizes.
>
> Thanks, you are correct. The current base model comes with 14" wheels.
> Hers is the top of the range one and the wheels are 16".
>
> Her old car was also the top of the range at the time, but it had 14"
> wheels. Was just wondering why they gave her a 16" space saver wheel for
> it?
>
(Snip)
> On 24/02/2022 21:05, alan_m wrote:
>> On 24/02/2022 19:16, JoeJoe wrote:
>>> My wife replaced her car last week - a Hyundai i10, 2014.
>>>
>>> It had 14" wheels, and came with no spare tyre, so she purchased a
>>> space saver one from the dealer when she bought the car. As it has
>>> never been used, I took it out of the car before she part exchanged
>>> it in the hope of eBaying it for £50 or so, put towards a similar
>>> spare for her new car that also came with none.
>>>
>>> Just had a closer look at it before listing, and when I measured the
>>> rim, it is in fact a 16"... Would that have worked when replacing
>>> a 14" wheel?
>>
>> Often different versions of same basic car come with different size
>> wheels. Look up the specification for the base model, the model with
>> extras as standard and perhaps the sporty version to see the range of
>> wheel sizes.
>
> Thanks, you are correct. The current base model comes with 14" wheels.
> Hers is the top of the range one and the wheels are 16".
>
> Her old car was also the top of the range at the time, but it had 14"
> wheels. Was just wondering why they gave her a 16" space saver wheel for
> it?
>
Space saver tyres will be a different size to the tyres on the car and
probably a lower profile so the larger size wheel is probably there to
bring the space saver diameter up to the same approximate size as the
car tyres
Brian
Feb 25, 2022, 3:30:02 AM2/25/22
to
to the ‘proper’ wheels- usually they are smaller.
BUT, besides (obviously) fitting the studs / holes, they need to clear the
brake assembly etc. Plus, some electric / hybrid cars are sensitive to
overall wheel ( including tyre) diameter.
Our Smart Car had different tyres front and rear ( normal on most Smarts).
We carried one space saver.
Some motorhome owners who up plate and change to 16” rims either don’t
change their spare or keep one of the old 15” wheels etc as a spare. ( Not
sure if this is wise / safe as the reason you change is to increase load
rating of tyres. I changed all five.)
JoeJoe
Feb 25, 2022, 3:33:47 AM2/25/22
to
was looking for as I am completely clueless as you have probably gathered...
JoeJoe
Feb 25, 2022, 4:13:27 AM2/25/22
to
if can be used as a replacement if needed.
Robin
Feb 25, 2022, 5:23:17 AM2/25/22
to
The law allows for it; and owners' manuals* sometimes warn about ground
clearance being reduced when they're fitted.
*I know it goes against the grain to RTFM but...
--
Robin
reply-to address is (intended to be) valid
Tim Lamb
Feb 25, 2022, 6:30:09 AM2/25/22
to
In message <617f5c07-5ad5-2234...@outlook.com>, Robin
<r...@outlook.com> writes
Snip
>
--
Tim Lamb
<r...@outlook.com> writes
Snip
>>> Space saver tyres will be a different size to the tyres on the car
>>>and probably a lower profile so the larger size wheel is probably
>>>there to bring the space saver diameter up to the same approximate
>>>size as the car tyres
>> Thanks for that. Will hold it against one of the wheels and check to
>>see if can be used as a replacement if needed.
>
>Space savers can have a smaller rolling radius than the regular tyres.
>The law allows for it; and owners' manuals* sometimes warn about ground
>clearance being reduced when they're fitted.
>
>*I know it goes against the grain to RTFM but...
Limited slip differentials should be considered..
>>>and probably a lower profile so the larger size wheel is probably
>>>there to bring the space saver diameter up to the same approximate
>>>size as the car tyres
>> Thanks for that. Will hold it against one of the wheels and check to
>>see if can be used as a replacement if needed.
>
>Space savers can have a smaller rolling radius than the regular tyres.
>The law allows for it; and owners' manuals* sometimes warn about ground
>clearance being reduced when they're fitted.
>
>*I know it goes against the grain to RTFM but...
>
--
Tim Lamb
John Rumm
Feb 25, 2022, 6:56:44 AM2/25/22
to
On 24/02/2022 19:16, JoeJoe wrote:
> My wife replaced her car last week - a Hyundai i10, 2014.
>
> It had 14" wheels, and came with no spare tyre, so she purchased a space
> saver one from the dealer when she bought the car. As it has never been
> used, I took it out of the car before she part exchanged it in the hope
> of eBaying it for £50 or so, put towards a similar spare for her new car
> that also came with none.
>
> Just had a closer look at it before listing, and when I measured the
> rim, it is in fact a 16"... Would that have worked when replacing a
> 14" wheel?
You can have two different wheel sizes but still come out at the same
>
> It had 14" wheels, and came with no spare tyre, so she purchased a space
> saver one from the dealer when she bought the car. As it has never been
> used, I took it out of the car before she part exchanged it in the hope
> of eBaying it for £50 or so, put towards a similar spare for her new car
> that also came with none.
>
> Just had a closer look at it before listing, and when I measured the
> rim, it is in fact a 16"... Would that have worked when replacing a
> 14" wheel?
overall wheel diameter when you include the tyre. Measuring it is
obviously the way to go, but you could also do it by calculation.
Type sizing is "odd" since it uses a pigs breakfast of different
measurements and units.
So say the original tyre was a 175/65 R14, would mean the tread is 175mm
wide. The height of the side wall is 65% of the width, so 113.75mm or
~4.5", and it's designed for a rim diameter of 14". So that would give
you a total diameter of 18.5"
Say the space saver is 16", but takes a tyre that is 105/60 R16, that
would give a tyre side wall height of 63mm or ~2.5", add that back to
the 16" rim diameter and you are back to 18.5" again.
> Also, her new car, also an i10, has 16" wheels, but the tyres are low
> profile ones, at least an inch narrower than the space saver.
same overall diameter.
> Will she be able to use this one as a spare? Are the lug holes
> standard? Both old and new car has/d 4, as does the space saver.
--
Cheers,
John.
/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/
Andrew
Feb 25, 2022, 8:44:29 AM2/25/22
to
seriously affect the ABS and Brake Assist (on newer
cars, another reason to keep to 50).
Apparently because spacesavers are lower profile and
run at a higher pressure the ride quality is dire from
what I've heard. Another reason to keep your speed down.
Dave Plowman (News)
Feb 25, 2022, 9:26:47 AM2/25/22
to
In article <FvSdnU4FAf4URIr_...@brightview.co.uk>,
size. Plenty cars changed wheel sizes during their production run without
altering the overall gearing.
> Also, her new car, also an i10, has 16" wheels, but the tyres are low
> profile ones, at least an inch narrower than the space saver.
> Will she be able to use this one as a spare? Are the lug holes
> standard? Both old and new car has/d 4, as does the space saver.
Not only the stud pattern but the size of the locating hole in the centre.
And just about every maker has their own combination.
--
*Why do we say something is out of whack? What is a whack?
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
JoeJoe <n...@mail.com> wrote:
> My wife replaced her car last week - a Hyundai i10, 2014.
> It had 14" wheels, and came with no spare tyre, so she purchased a space
> saver one from the dealer when she bought the car. As it has never been
> used, I took it out of the car before she part exchanged it in the hope
> of eBaying it for £50 or so, put towards a similar spare for her new car
> that also came with none.
> Just had a closer look at it before listing, and when I measured the
> rim, it is in fact a 16"... Would that have worked when replacing a
> 14" wheel?
It's the rolling radius of the wheel and tyre that matters. Not the wheel
> My wife replaced her car last week - a Hyundai i10, 2014.
> It had 14" wheels, and came with no spare tyre, so she purchased a space
> saver one from the dealer when she bought the car. As it has never been
> used, I took it out of the car before she part exchanged it in the hope
> of eBaying it for £50 or so, put towards a similar spare for her new car
> that also came with none.
> Just had a closer look at it before listing, and when I measured the
> rim, it is in fact a 16"... Would that have worked when replacing a
> 14" wheel?
size. Plenty cars changed wheel sizes during their production run without
altering the overall gearing.
> Also, her new car, also an i10, has 16" wheels, but the tyres are low
> profile ones, at least an inch narrower than the space saver.
> Will she be able to use this one as a spare? Are the lug holes
> standard? Both old and new car has/d 4, as does the space saver.
And just about every maker has their own combination.
--
*Why do we say something is out of whack? What is a whack?
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
Brian
Feb 25, 2022, 9:50:48 AM2/25/22
to
Break down services like the AA / RAC carry ( or used to) a few ‘standard’
space saver wheels for cars that don’t carry them. I remember a AA or RAC
Van turning up with one to a car on a campsite we were on. He had a few in
the back. No idea how the system works - ie if they take you wheel and have
it repaired etc or you borrow the space saver and return it somehow.
I’m not a fan of space savers but I certainly don’t trust the gunge many
cars come with.
John Rumm
Feb 25, 2022, 11:02:01 AM2/25/22
to
On 25/02/2022 11:56, John Rumm wrote:
> On 24/02/2022 19:16, JoeJoe wrote:
>> My wife replaced her car last week - a Hyundai i10, 2014.
>>
>> It had 14" wheels, and came with no spare tyre, so she purchased a
>> space saver one from the dealer when she bought the car. As it has
>> never been used, I took it out of the car before she part exchanged it
>> in the hope of eBaying it for £50 or so, put towards a similar spare
>> for her new car that also came with none.
>>
>> Just had a closer look at it before listing, and when I measured the
>> rim, it is in fact a 16"... Would that have worked when replacing
>> a 14" wheel?
>
> You can have two different wheel sizes but still come out at the same
> overall wheel diameter when you include the tyre. Measuring it is
> obviously the way to go, but you could also do it by calculation.
>
> Type sizing is "odd" since it uses a pigs breakfast of different
> measurements and units.
>
> So say the original tyre was a 175/65 R14, would mean the tread is 175mm
> wide. The height of the side wall is 65% of the width, so 113.75mm or
> ~4.5", and it's designed for a rim diameter of 14". So that would give
> you a total diameter of 18.5"
>
> Say the space saver is 16", but takes a tyre that is 105/60 R16, that
> would give a tyre side wall height of 63mm or ~2.5", add that back to
> the 16" rim diameter and you are back to 18.5" again.
Doh! Although one should allow for the maths cockup there :-)
> On 24/02/2022 19:16, JoeJoe wrote:
>> My wife replaced her car last week - a Hyundai i10, 2014.
>>
>> It had 14" wheels, and came with no spare tyre, so she purchased a
>> space saver one from the dealer when she bought the car. As it has
>> never been used, I took it out of the car before she part exchanged it
>> in the hope of eBaying it for £50 or so, put towards a similar spare
>> for her new car that also came with none.
>>
>> Just had a closer look at it before listing, and when I measured the
>> rim, it is in fact a 16"... Would that have worked when replacing
>> a 14" wheel?
>
> You can have two different wheel sizes but still come out at the same
> overall wheel diameter when you include the tyre. Measuring it is
> obviously the way to go, but you could also do it by calculation.
>
> Type sizing is "odd" since it uses a pigs breakfast of different
> measurements and units.
>
> So say the original tyre was a 175/65 R14, would mean the tread is 175mm
> wide. The height of the side wall is 65% of the width, so 113.75mm or
> ~4.5", and it's designed for a rim diameter of 14". So that would give
> you a total diameter of 18.5"
>
> Say the space saver is 16", but takes a tyre that is 105/60 R16, that
> would give a tyre side wall height of 63mm or ~2.5", add that back to
> the 16" rim diameter and you are back to 18.5" again.
(obviously the tyre wall height increases the *diameter* by twice as
much as it increases the radius - but the logic stands)
JoeJoe
Feb 25, 2022, 6:55:18 PM2/25/22
to
JoeJoe
Feb 25, 2022, 6:59:09 PM2/25/22
to
On 25/02/2022 14:26, Dave Plowman (News) wrote:
> In article <FvSdnU4FAf4URIr_...@brightview.co.uk>,
> JoeJoe <n...@mail.com> wrote:
>> My wife replaced her car last week - a Hyundai i10, 2014.
>
>> It had 14" wheels, and came with no spare tyre, so she purchased a space
>> saver one from the dealer when she bought the car. As it has never been
>> used, I took it out of the car before she part exchanged it in the hope
>> of eBaying it for £50 or so, put towards a similar spare for her new car
>> that also came with none.
>
>> Just had a closer look at it before listing, and when I measured the
>> rim, it is in fact a 16"... Would that have worked when replacing a
>> 14" wheel?
>
> It's the rolling radius of the wheel and tyre that matters. Not the wheel
> size. Plenty cars changed wheel sizes during their production run without
> altering the overall gearing.
Thanks for that - a few others suggested the same.
> In article <FvSdnU4FAf4URIr_...@brightview.co.uk>,
> JoeJoe <n...@mail.com> wrote:
>> My wife replaced her car last week - a Hyundai i10, 2014.
>
>> It had 14" wheels, and came with no spare tyre, so she purchased a space
>> saver one from the dealer when she bought the car. As it has never been
>> used, I took it out of the car before she part exchanged it in the hope
>> of eBaying it for £50 or so, put towards a similar spare for her new car
>> that also came with none.
>
>> Just had a closer look at it before listing, and when I measured the
>> rim, it is in fact a 16"... Would that have worked when replacing a
>> 14" wheel?
>
> It's the rolling radius of the wheel and tyre that matters. Not the wheel
> size. Plenty cars changed wheel sizes during their production run without
> altering the overall gearing.
>> Also, her new car, also an i10, has 16" wheels, but the tyres are low
>> profile ones, at least an inch narrower than the space saver.
>
>> Will she be able to use this one as a spare? Are the lug holes
>> standard? Both old and new car has/d 4, as does the space saver.
>
> Not only the stud pattern but the size of the locating hole in the centre.
> And just about every maker has their own combination.
alan_m
Feb 26, 2022, 1:38:31 AM2/26/22
to
On 25/02/2022 14:26, Dave Plowman (News) wrote:
> It's the rolling radius of the wheel and tyre that matters. Not the wheel
> size. Plenty cars changed wheel sizes during their production run without
> altering the overall gearing.
Possibly not in the UK but it is common for people to change to winter
> size. Plenty cars changed wheel sizes during their production run without
> altering the overall gearing.
tyres with a different profile or wheel size.
Dave Plowman (News)
Feb 26, 2022, 8:36:49 AM2/26/22
to
In article <j7u070...@mid.individual.net>,
wheels and tyres I'd still check with the maker these are suitable.
A different rolling radius on driven wheels might well result in the
differential overheating. The bearings and gears in that not designed to
rotate for long periods
--
*Drugs may lead to nowhere, but at least it's the scenic route *
alan_m <ju...@admac.myzen.co.uk> wrote:
> On 25/02/2022 14:26, Dave Plowman (News) wrote:
> > It's the rolling radius of the wheel and tyre that matters. Not the wheel
> > size. Plenty cars changed wheel sizes during their production run without
> > altering the overall gearing.
> Possibly not in the UK but it is common for people to change to winter
> tyres with a different profile or wheel size.
Changing all the wheel rolling radius likely OK. But if buying new winter
> On 25/02/2022 14:26, Dave Plowman (News) wrote:
> > It's the rolling radius of the wheel and tyre that matters. Not the wheel
> > size. Plenty cars changed wheel sizes during their production run without
> > altering the overall gearing.
> Possibly not in the UK but it is common for people to change to winter
> tyres with a different profile or wheel size.
wheels and tyres I'd still check with the maker these are suitable.
A different rolling radius on driven wheels might well result in the
differential overheating. The bearings and gears in that not designed to
rotate for long periods
--
*Drugs may lead to nowhere, but at least it's the scenic route *
Roger Mills
Feb 26, 2022, 12:11:57 PM2/26/22
to
On 26/02/2022 13:35, Dave Plowman (News) wrote:
> In article <j7u070...@mid.individual.net>,
> alan_m <ju...@admac.myzen.co.uk> wrote:
>> On 25/02/2022 14:26, Dave Plowman (News) wrote:
>
>>> It's the rolling radius of the wheel and tyre that matters. Not the wheel
>>> size. Plenty cars changed wheel sizes during their production run without
>>> altering the overall gearing.
>
>> Possibly not in the UK but it is common for people to change to winter
>> tyres with a different profile or wheel size.
>
> Changing all the wheel rolling radius likely OK. But if buying new winter
> wheels and tyres I'd still check with the maker these are suitable.
>
> A different rolling radius on driven wheels might well result in the
> differential overheating. The bearings and gears in that not designed to
> rotate for long periods
>
Yes, the rolling radius is a function of the rim radius plus the tyre
> In article <j7u070...@mid.individual.net>,
> alan_m <ju...@admac.myzen.co.uk> wrote:
>> On 25/02/2022 14:26, Dave Plowman (News) wrote:
>
>>> It's the rolling radius of the wheel and tyre that matters. Not the wheel
>>> size. Plenty cars changed wheel sizes during their production run without
>>> altering the overall gearing.
>
>> Possibly not in the UK but it is common for people to change to winter
>> tyres with a different profile or wheel size.
>
> Changing all the wheel rolling radius likely OK. But if buying new winter
> wheels and tyres I'd still check with the maker these are suitable.
>
> A different rolling radius on driven wheels might well result in the
> differential overheating. The bearings and gears in that not designed to
> rotate for long periods
>
standing height - which, in turn, is a function of the tyre width and
aspect ratio.
My previous car (A Volvo V70) had 225 x 45 x 17" tyres as standard. I
also had a set of winter tyres and rims which were 215 x 55 x 16" (I
think). At any rate, these higher profile tyres on 16" rims had
virtually the same rolling radius as the standard low profile tyres on
17" rims.
Coming back to the original subject, spacesaver wheels have very narrow
tyres compared to the regular tyres, with a much smaller standing height
- which is why the rim diameter needs to be higher in order to maintain
the correct rolling radius. They also run at a much higher pressure -
typically 80 psi c.f. 35 psi and are only intended for emergency use at
speeds of no more than 50 mph.
--
Cheers,
Roger
The Natural Philosopher
Feb 26, 2022, 12:39:31 PM2/26/22
to
On 26/02/2022 17:11, Roger Mills wrote:
> Yes, the rolling radius is a function of the rim radius plus the tyre
> standing height - which, in turn, is a function of the tyre width and
> aspect ratio.
No, the rolling radius is a function of the tyre *circumference* divided
> Yes, the rolling radius is a function of the rim radius plus the tyre
> standing height - which, in turn, is a function of the tyre width and
> aspect ratio.
by 2 Pi
It has almost nothing to do with the 'standing height'.
--
"Nature does not give up the winter because people dislike the cold."
― Confucius
Tim Lamb
Feb 26, 2022, 12:50:29 PM2/26/22
to
In message <svdoke$f55$1...@dont-email.me>, The Natural Philosopher
<t...@invalid.invalid> writes
can't have a *point* contact with the road if the wheel is carrying any
load?
--
Tim Lamb
<t...@invalid.invalid> writes
>On 26/02/2022 17:11, Roger Mills wrote:
>> Yes, the rolling radius is a function of the rim radius plus the tyre
>>standing height - which, in turn, is a function of the tyre width and
>>aspect ratio.
>
>No, the rolling radius is a function of the tyre *circumference*
>divided by 2 Pi
>
>It has almost nothing to do with the 'standing height'.
Didn't we have this discussion? I thought it was established that you
>> Yes, the rolling radius is a function of the rim radius plus the tyre
>>standing height - which, in turn, is a function of the tyre width and
>>aspect ratio.
>
>No, the rolling radius is a function of the tyre *circumference*
>divided by 2 Pi
>
>It has almost nothing to do with the 'standing height'.
can't have a *point* contact with the road if the wheel is carrying any
load?
--
Tim Lamb
The Natural Philosopher
Feb 26, 2022, 1:40:41 PM2/26/22
to
dominated by a piece of schoolboy artstudent simpleminded fantasy that
anything more or less round has a 'radius' defined by the distance of
its axle centre from a surface tangential to the circumference at some
arbitrary point.
What is the 'rolling radius' of a tank track.....
--
Climate is what you expect but weather is what you get.
Mark Twain
Roger Mills
Feb 27, 2022, 5:11:30 PM2/27/22
to
On 26/02/2022 17:39, The Natural Philosopher wrote:
> On 26/02/2022 17:11, Roger Mills wrote:
>> Yes, the rolling radius is a function of the rim radius plus the tyre
>> standing height - which, in turn, is a function of the tyre width and
>> aspect ratio.
>
> No, the rolling radius is a function of the tyre *circumference* divided
> by 2 Pi
>
> It has almost nothing to do with the 'standing height'.
>
>
>
You're splitting hairs! Maybe "standing height" isn't the correct term.
> On 26/02/2022 17:11, Roger Mills wrote:
>> Yes, the rolling radius is a function of the rim radius plus the tyre
>> standing height - which, in turn, is a function of the tyre width and
>> aspect ratio.
>
> No, the rolling radius is a function of the tyre *circumference* divided
> by 2 Pi
>
> It has almost nothing to do with the 'standing height'.
>
>
>
The radius on which the circumference is based is the rim radius plus
(tyre width x aspect ratio). OK, the centre of the axle will be slightly
closer to the ground than this due to the flattening of the contact patch.
In theory, the circumference is the length of the internal belt (in a
radial tyre) and the revs per mile doesn't change as the tyre wears -
but I don't entirely buy that.
--
Cheers,
Roger
The Natural Philosopher
Feb 28, 2022, 5:42:23 AM2/28/22
to
On 27/02/2022 22:11, Roger Mills wrote:
> On 26/02/2022 17:39, The Natural Philosopher wrote:
>> On 26/02/2022 17:11, Roger Mills wrote:
>>> Yes, the rolling radius is a function of the rim radius plus the tyre
>>> standing height - which, in turn, is a function of the tyre width and
>>> aspect ratio.
>>
>> No, the rolling radius is a function of the tyre *circumference*
>> divided by 2 Pi
>>
>> It has almost nothing to do with the 'standing height'.
>>
>>
>>
>
> You're splitting hairs! Maybe "standing height" isn't the correct term.
> The radius on which the circumference is based is the rim radius plus
> (tyre width x aspect ratio). OK, the centre of the axle will be slightly
> closer to the ground than this due to the flattening of the contact patch.
>
Bolocks. there is no 'radius' to a non circular tyre.
> On 26/02/2022 17:39, The Natural Philosopher wrote:
>> On 26/02/2022 17:11, Roger Mills wrote:
>>> Yes, the rolling radius is a function of the rim radius plus the tyre
>>> standing height - which, in turn, is a function of the tyre width and
>>> aspect ratio.
>>
>> No, the rolling radius is a function of the tyre *circumference*
>> divided by 2 Pi
>>
>> It has almost nothing to do with the 'standing height'.
>>
>>
>>
>
> You're splitting hairs! Maybe "standing height" isn't the correct term.
> The radius on which the circumference is based is the rim radius plus
> (tyre width x aspect ratio). OK, the centre of the axle will be slightly
> closer to the ground than this due to the flattening of the contact patch.
>
The circumference of a tyre does not change (much) as the tyre deflates.
the 'Standing height' dies, massively.
> In theory, the circumference is the length of the internal belt (in a
> radial tyre) and the revs per mile doesn't change as the tyre wears -
> but I don't entirely buy that.
greater than the cords, because there is rubber on top. Obviously, but
it doesn't change with inflation. apart from stretching slightly.
Obviously it does change with wear, a little.
--
“A leader is best When people barely know he exists. Of a good leader,
who talks little,When his work is done, his aim fulfilled,They will say,
“We did this ourselves.”
― Lao Tzu, Tao Te Ching
Roger Mills
Mar 1, 2022, 9:31:02 AM3/1/22
to
On 28/02/2022 10:42, The Natural Philosopher wrote:
> On 27/02/2022 22:11, Roger Mills wrote:
>> On 26/02/2022 17:39, The Natural Philosopher wrote:
>>> On 26/02/2022 17:11, Roger Mills wrote:
>>>> Yes, the rolling radius is a function of the rim radius plus the
>>>> tyre standing height - which, in turn, is a function of the tyre
>>>> width and aspect ratio.
>>>
>>> No, the rolling radius is a function of the tyre *circumference*
>>> divided by 2 Pi
>>>
>>> It has almost nothing to do with the 'standing height'.
>>>
>>>
>>>
>>
>> You're splitting hairs! Maybe "standing height" isn't the correct
>> term. The radius on which the circumference is based is the rim radius
>> plus (tyre width x aspect ratio). OK, the centre of the axle will be
>> slightly closer to the ground than this due to the flattening of the
>> contact patch.
>>
> Bolocks. there is no 'radius' to a non circular tyre.
> The circumference of a tyre does not change (much) as the tyre deflates.
> the 'Standing height' dies, massively.
>
>
Slitting hairs again. There is an "effective" rolling radius which is
> On 27/02/2022 22:11, Roger Mills wrote:
>> On 26/02/2022 17:39, The Natural Philosopher wrote:
>>> On 26/02/2022 17:11, Roger Mills wrote:
>>>> Yes, the rolling radius is a function of the rim radius plus the
>>>> tyre standing height - which, in turn, is a function of the tyre
>>>> width and aspect ratio.
>>>
>>> No, the rolling radius is a function of the tyre *circumference*
>>> divided by 2 Pi
>>>
>>> It has almost nothing to do with the 'standing height'.
>>>
>>>
>>>
>>
>> You're splitting hairs! Maybe "standing height" isn't the correct
>> term. The radius on which the circumference is based is the rim radius
>> plus (tyre width x aspect ratio). OK, the centre of the axle will be
>> slightly closer to the ground than this due to the flattening of the
>> contact patch.
>>
> Bolocks. there is no 'radius' to a non circular tyre.
> The circumference of a tyre does not change (much) as the tyre deflates.
> the 'Standing height' dies, massively.
>
>
the rolling circumference divided by 2Pi - which you yourself referred
to as "rolling radius" earlier in the thread!
>> In theory, the circumference is the length of the internal belt (in a
>> radial tyre) and the revs per mile doesn't change as the tyre wears -
>> but I don't entirely buy that.
>
>
> The circumference of the tyre is the length round its carcass - that is
> greater than the cords, because there is rubber on top. Obviously, but
> it doesn't change with inflation. apart from stretching slightly.
> Obviously it does change with wear, a little.
>
revolution of the wheel, the car moves forward by the circumference of
the belt (like a track-laying vehicle) and that the rubber squishes to suit.
--
Cheers,
Roger
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