Re: Rim Identification?
Chalo
>
> I acquired a wheelset recently and would like to identify the rims.
> The rims are alloy and feature three concentric grooves on each rim
> side. Unusual, to me at least. There are no manufacturer markings -
> I suspect there were labels near the valve holes. At some point
> someone widened the holes out to schrader. O_o
>
> http://img42.imageshack.us/img42/2083/1000609s.jpg
It was normal for 27 inch clinchers to have Schrader valve
drillings.
That looks like pretty ordinary OEM stuff from 20-30 years ago. Is it
single-walled or double-walled? Single wall was more typical for 27
inch wheels with plated steel spokes.
It's true that sidewall grooves are far more common now, with the
advent of European requirements for rim wear indicators, than they
were when your rims were made.
Chalo
Chalo
Norman
wrote:
> On Nov 4, 4:46 pm, Chalo <chalo.col...@gmail.com> wrote:
>
> > The Troll Feeder wrote:
> > [...]
>
> > That looks like pretty ordinary OEM stuff from 20-30 years ago. Is it
> > single-walled or double-walled? Single wall was more typical for 27
> > inch wheels with plated steel spokes.
>
> > It's true that sidewall grooves are far more common now, with the
> > advent of European requirements for rim wear indicators, than they
> > were when your rims were made.
>
> > Chalo
>
> other purpose than wear indication? Unfortunately my current camera
> has no macro but here's one valve hole - they are both a bit chewed up
> which is why I assumed they were widened.
>
> http://img195.imageshack.us/img195/2296/1000612k.jpg
>
Better focus might have helped on the circumferential grooves,
but I have an old mavic 27" double wall that was originally either
presta or woods valved, sadly similarly enlarged by a previous
owner. Sometimes there are subtle markings under the tape,
so if you're going to relace it anyway, you might look there.
It's Chris
that shows these grooves?
Back in the late 70's some rim manufacturers put grooves on their rims
reasoning that they would act like treads on a tire preventing brake pad
"hydroplaning" and improve wet weather stopping.
I have never heard of wear indicators on a rim surface before.
- -
Compliments of:
"Your Friendly Neighborhood Wheelman"
If you want to E-mail me use:
ChrisZCorner "at" webtv "dot" net
Chalo
>
> I have never heard of wear indicators on a rim surface before.
Alex uses a circumferential groove on the braking surface
(questionable to me, since the bottom of the groove can wear too).
Mavic uses some sort of notch cut inside the rim sidewall that turns
into a hole when the rim is done. I'm not sure what the other makers
do, but to me it looks like Sun rims do not incorporate wear
indicators.
Chalo
Michael Press
<49bb669f-37d0-4b04...@g1g2000pra.googlegroups.com>,
The Troll Feeder <the.trol...@gmail.com> wrote:
> On Nov 4, 4:46 pm, Chalo <chalo.col...@gmail.com> wrote:
> > The Troll Feeder wrote:
> > [...]
> >
> > That looks like pretty ordinary OEM stuff from 20-30 years ago. Is it
> > single-walled or double-walled? Single wall was more typical for 27
> > inch wheels with plated steel spokes.
> >
> > It's true that sidewall grooves are far more common now, with the
> > advent of European requirements for rim wear indicators, than they
> > were when your rims were made.
> >
> > Chalo
>
> Yes these are single wall 27"`s. I take it the grooves are for some
> other purpose than wear indication? Unfortunately my current camera
> has no macro but here's one valve hole - they are both a bit chewed up
> which is why I assumed they were widened.
>
> http://img195.imageshack.us/img195/2296/1000612k.jpg
Consider the possibility that the rims were originally
drilled for presta and somebody opened the hole for schrader.
--
Michael Press
thirty-six
> In article
> <49bb669f-37d0-4b04-bfb9-e12e03651...@g1g2000pra.googlegroups.com>,
> The Troll Feeder <the.troll.fee...@gmail.com> wrote:
>
>
>
> > On Nov 4, 4:46 pm, Chalo <chalo.col...@gmail.com> wrote:
> > > The Troll Feeder wrote:
> > > [...]
>
> > > That looks like pretty ordinary OEM stuff from 20-30 years ago. Is it
> > > single-walled or double-walled? Single wall was more typical for 27
> > > inch wheels with plated steel spokes.
>
> > > It's true that sidewall grooves are far more common now, with the
> > > advent of European requirements for rim wear indicators, than they
> > > were when your rims were made.
>
> > > Chalo
>
> > Yes these are single wall 27"`s. I take it the grooves are for some
> > other purpose than wear indication? Unfortunately my current camera
> > has no macro but here's one valve hole - they are both a bit chewed up
> > which is why I assumed they were widened.
>
> >http://img195.imageshack.us/img195/2296/1000612k.jpg
>
> Consider the possibility that the rims were originally
> drilled for presta and somebody opened the hole for schrader.
>
Not a high pressure size so unlikely to be fitted with a presta
valve. The common bicycle valve is a Woods or Dunlop. Schrader
valves are for cars. Presta is for racing tyres, AKA tubulars. The
high pressure wired-on tyre is an abomination. It's too fussy for
reliable everyday use.
Norman
I once pumped a wire-bead tire to 552,000 pascals*,
and boy did it ever do a number on the road.
* that's a LOT, trust me.
Chalo
>
> The common bicycle valve is a Woods or Dunlop. Schrader
> valves are for cars. Presta is for racing tyres, AKA tubulars. The
> high pressure wired-on tyre is an abomination. It's too fussy for
> reliable everyday use.
Mike Causer
thirty-six <thirt...@live.co.uk> wrote:
> Not a high pressure size so unlikely to be fitted with a presta
> valve. The common bicycle valve is a Woods or Dunlop. Schrader
> valves are for cars. Presta is for racing tyres, AKA tubulars. The
> high pressure wired-on tyre is an abomination. It's too fussy for
> reliable everyday use.
Ahhh, I've just twigged your nom-de-internet. It's for 1936 isn't it?
Mike
--
Mike Causer
landotter
What's that in Bertrand Russells?
AMuzi
80.06 psi
http://www.wolframalpha.com/input/?i=convert+552000+pascals+to+psi
I guess I missed the context if that's 'a LOT' .
--
Andrew Muzi
<www.yellowjersey.org/>
Open every day since 1 April, 1971
Norman
>
> I guess I missed the context if that's 'a LOT' .
>
Well, it sure is a lot of pascals. I'd hate to be the one who
had to count 'em all.
Norman
& that's what I get for drinkin' & not self-editin': You will note
that 552000 has 3 (tres) significant digits and your hoopty-
ass tungsten-aleph nonsense of 80.06 has . . .
Wait for it
. . . four (IIII (IV)) fucking significant digits. IE it is wrong.
Wrong woronog worng wrngowgnorwgrong
AMuzi
So one pound is exactly 2(extraneous digits removed) kilos?
RonSonic
Thank you, Chalo. I was at a loss to express my complete confluxulation and
enbafflement.
TBH, I don't recall having ever actually seen a Dunlop valve in person.
--
Oh damn. There's that annoying blog. Again. http://dumbbikeblog.blogspot.com
Norman
And now you know how scientists feel.
But if you just mysteriously make it 1.00000
you're in a whole new ball park.
landotter
> On Thu, 5 Nov 2009 12:16:01 -0800 (PST), Chalo <chalo.col...@gmail.com> wrote:
> >thirty-six wrote:
>
> >> The common bicycle valve is a Woods or Dunlop. Schrader
> >> valves are for cars. Presta is for racing tyres, AKA tubulars. The
> >> high pressure wired-on tyre is an abomination. It's too fussy for
> >> reliable everyday use.
>
> >http://www.youtube.com/watch?v=NzlG28B-R8Y
>
> Thank you, Chalo. I was at a loss to express my complete confluxulation and
> enbafflement.
>
> TBH, I don't recall having ever actually seen a Dunlop valve in person.
They used to be quite common on European utility bikes up till the
80s. I've pumped a few. More robust than presta, but Schrader makes
them obsolete.
I usually drill rims to Schrader if they're wide enough. If I'm
feeling fancy, I finish off the wheel with a vintage valve cap with
the integrated valve tool, if I've got one handy. ;-)
bjwe...@gmail.com
> On Thu, 5 Nov 2009 12:16:01 -0800 (PST), Chalo <chalo.col...@gmail.com> wrote:
> >thirty-six wrote:
>
> >> The common bicycle valve is a Woods or Dunlop. Schrader
> >> valves are for cars. Presta is for racing tyres, AKA tubulars. The
> >> high pressure wired-on tyre is an abomination. It's too fussy for
> >> reliable everyday use.
>
> >http://www.youtube.com/watch?v=NzlG28B-R8Y
>
> Thank you, Chalo. I was at a loss to express my complete confluxulation and
> enbafflement.
>
> TBH, I don't recall having ever actually seen a Dunlop valve in person.
A friend of mine lives in the UK at the moment and I was
trying to give her some advice over the phone on bike pumps,
sight unseen. It turned out, much to my stupefaction, that
the new tube a UK bike shop had sold her within the past
year had a Woods valve, and she had a Schrader pump
(being from the US, she knew about Schrader and was
puzzled by the Woods).
I too had thought they were a historical curiosity. In fact,
I still think they are a historical curiosity, but in the UK
one preserves and uses historical curiosities Just Because.
Ben
Andre Jute
wrote:
The Woods valve aka Dunlop valve is alive and well and probably being
issued on this week on more bikes in Europe than will be sold in the
States in a year. My 2004 Gazelle Toulouse (an explicitly sporting
bike) arrived with tubes fitted with Woods valves, and a newly
designed, up-to-date pump from SKS to use on it. Do you really think
SKS will design a new pump for an obsolete valve? My top of the range
Benelux-special Trek arrived with another SKS pump for Woods valves.
Because it doesn't have the spring-loaded closure of the Schrader, the
Woods valve is easier to inflate with a hand pump than the automobile
valve (Schrader) that came into bicycles with the mountain bike craze,
and less fragile than the Presta, which takes some skill not to wreck.
The demise of the Woods has been forecast often but never correctly.
Just because something isn't sold in your LBS doesn't mean it is
obsolete. My LBS carries regular stock of Woods valved tubes.
Andre Jute
Visit Andre's Gazelle Toulouse at
http://www.audio-talk.co.uk/fiultra/BICYCLE%20Bauhaus.html
thirty-six
... they work. Greater airflow than a presta and not so big as to
compromise rim integrity. And after fifteen years, you can easily
replace the valve rubber ;-) Oh yes, and when you are fixing a slow
puncture, you pop the valve and the tube is deflated in a moment. No
fiddling. Nip the valve back down and remove the tube. Much easier
than a presta or schrader, and appreciated at -10degC . So they are
quicker to use all around with a little experience.
Clive George
news:266c332b-a4a1-49c9...@u36g2000prn.googlegroups.com...
> My 2004 Gazelle Toulouse (an explicitly sporting bike)
Is that the same "Sport" as in "Sports Utility Vehicle"?
Andre Jute
> "Andre Jute" <fiult...@yahoo.com> wrote in message
>
> news:266c332b-a4a1-49c9...@u36g2000prn.googlegroups.com...
>
> > My 2004 Gazelle Toulouse (an explicitly sporting bike)
> Is that the same "Sport" as in "Sports Utility Vehicle"?
Or could it be the same "sport" as in "Poor Clive George crouches on
his bike like gorilla in too small a cage, so did he choose his bike
too small or is he a genetic sport?"
***
"Daddy, daddy! Lookit the poor cripple on his bike!"
"Don't stare, son. Hey, Mister, who's the custom solderer who made
that little bike fit your-- er-- peculiarities so well?"
***
Andre Jute
A roadie in full fig, arse in the air, is a visual incitement to
"pour encourager les autres".
"We used to call it a wedgie." -- Correspondent to my private mailbox,
commenting on the above tag-line.
Michael Press
<1dad49db-6793-4c0b...@v15g2000prn.googlegroups.com>,
"b...@mambo.ucolick.org" <bjwe...@gmail.com> wrote:
Woods valves were put under the auspices of The National Trust.
--
Michael Press
Chalo
>
> b...@mambo.ucolick.org wrote:
> >
> > RonSonic wrote:
> > >
> > > TBH, I don't recall having ever actually seen a Dunlop valve in person.
> >
> > the new tube a UK bike shop had sold her within the past
> > year had a Woods valve, and she had a Schrader pump
> > (being from the US, she knew about Schrader and was
> > puzzled by the Woods).
>
> compromise rim integrity.
I only ever see them when servicing Dutch bikes. Those are invariably
drilled such that I can substitute a Schrader valve tube as
necessary.
Unlike Presta or Woods valves, Schrader valves seem to work 100.0% of
the time. I can't recall the last time I had to tighten or replace a
Schrader valve core. Failures in the other types are statistically
significant.
Chalo
thirty-six
So, would you like this super duper fast, ultra manouverable, where
did it go fighter plane or this approved reliable monster that wont
fall out of the sky ever due to design and construction.
I think problems with Woods' and Presta valves is due to lack of
familiarity. They do require you to get your fingers in there but not
use pliers and dont oil them or make for uneccessary disassembly.
Using dust caps helps protect the seal on all valves, but because the
schraeder generally incorporates a strong spring, contamination is
least affecting in this design. I use the dust caps and only my
fingers and have few problems with any valve. IME Schrader valves
have likely given the most trouble, this has included poor seating of
the core to the sleeve and poor valve sealing. Each of these probs
can be tackled with good sealing valve caps.