Tom Kunich <
cycl...@gmail.com> wrote:
> On Thursday, March 11, 2021 at 2:53:13 PM UTC-8, John B. wrote:
>> On Thu, 11 Mar 2021 11:09:27 -0500, Frank Krygowski
>> <
frkr...@sbcglobal.net> wrote:
>>
>>> On 3/10/2021 9:43 PM, John B. wrote:
>>>>
>>>> Well there is the debate about the gravel and CX bikes but here,
>>>> essentially, all the roads, or at least all the roads I see, are
>>>> paved. I've been riding 23mm tires since I switched from "sew-ups".
>>>
>>> I think the narrowest tires ever used for more than a short time were
>>> 25mm. I've spent most of my road riding time on 28s, some on 32s, a bit
>>> on 35s or 37s when doing loaded touring.
>>>
>>> It seems the latest data indicates the super narrow tires have no lower
>>> rolling resistance than similarly constructed wider tires, unless you're
>>> on a surface as smooth as a velodrome track. And wider tires tend to be
>>> less flat prone and more comfortable.
>> Well,I never thought that 23's were "super narrow" as I had ridden
>> 19mm sew ups at one time :-) and as for rolling resistance I have the
>> suspicions that it is a highly over rated consideration. Does a 25mm
>> tire (pumped up to 100 psi) really decrease your speed on your 2 mile
>> Sunday ride to Church? And as for"more comfortable" I remember a bloke
>> named Frank, telling the world how tension your thigh muscles a bit
>> and sort of decompress your buttocks when riding over bumps. My own
>> humble opinion is if you want springs then buy a mountain bike. They
>> come with front and back suspension.
>
> Tests of rolling resistance mean almost nothing because they do not
> reflect real world conditions. There is no rider on the test machine and
> there are no real road conditions. That is why the road Pros discovered
> that wide tires are actually faster. Not because of the tiny difference
> in rolling resistance but because in the road world on normal road
> conditions the rider is being thrown up and down and that is similar to
> putting the brakes on. Pro's used to somewhat make up for this by riding
> extremely smoothly being very careful with their pedal strokes etc. But
> with the wider tires (most pro's in the Tour use 26 mm sewups they are a
> lot more free to ride any way they like. Smooth circular pedal strokes no
> longer gain them as much and you can watch some of them riding as "mashers".
>
Pros seem as a group rather conservative, regarding kit, see Chris Froome
and disk brakes for recent examples. Ie tendency to resist rather than
embrace change.
To the best of my knowledge tubs have been overtaken by clinchers in terms
of raw speed, for some years now, according to manufacturers etc.
I do have some sympathy for pros and disks/though axels which I suspect for
a Pro offers little advantages for them, but increases time and complexity
of wheel changes.
This said according to some tubeless plus sealant would be a fire and
forget solution, not yet been convinced the faff is worth it yet for
myself.
Roger Merriman