650 rims on a 700 frame

[Nate Knutson]

Hank Wirtz wrote:
> "Nate Knutson" <[email protected]> wrote in
> news:[email protected]:
>
>
> >
> > How old are the oldest 571-23's? And I'm not just asking about 23's,
> > even though them and 20ish are the predominant narrow 571's today, I
> > imagine that this wasn't always so.
> >
>
> Dunno about oldest, but most would point to Ray Browning winning the '89
> Ironman NZ on a 650c bike as being the birth of their popularity.\

I'm pretty sure they're quite a bit older than the modern incarnations
of them for tri and some small modern road bikes. I've seen references
to the French name system they're part of existing in the 40's,
although I don't know any more than that. The rwhole reason I brought
it up was to see if anyone knew which 571 actually appeared first. I
don't know for sure when S7 came out either.

 

[Marcus Coles]

Kinky Cowboy wrote:
> On Sun, 2 Apr 2006 05:51:53 +1000, meb
> <[email protected]> wrote:
>
>> [email protected] Wrote:
>>> since my goal is to run wider than 28mm tires, is it possible to use
>>> 26" rims. Are any brake calipers made that will work with extra long
>>> reach?
>> You'll likely need go to 559 to do the trick, then you'll have a wider
>> variety of rubber, especially wide.
>
> And change the frame to one designed to take 559s too, seems much
> simpler and probably cheaper than trying to shoe-horn the wrong wheels
> into a 700c frame.
>
>

584mm or 590mm wheels may work OK with a large enough tire, but the big
killer of a 571mm or 559mm conversion is that the bottom bracket of a
700c frame is going to be down in the weeds.
This will require careful cornering and rough ground techniques.
No long brake arms or drop bolts will get around that, perhaps some
kiddie crank arms or some chopper forks might though ;-)

Marcus

 

[Hank Wirtz]

"Nate Knutson" <[email protected]> wrote in news:1143944543.866292.205340
@j33g2000cwa.googlegroups.com:


>
> I'm pretty sure they're quite a bit older than the modern incarnations
> of them for tri and some small modern road bikes. I've seen references
> to the French name system they're part of existing in the 40's,
> although I don't know any more than that. The rwhole reason I brought
> it up was to see if anyone knew which 571 actually appeared first. I
> don't know for sure when S7 came out either.
>
Well, S7 is also known as 26x1&3/4, which works out to about 45mm. In
reality, the tires were about 40mm. The 650 was supposed to refer to the
outer diameter of the wheel. 571mm BSD + (40mm tire x 2 sides of the wheel)
=651mm. The S7 size _is_ the original incarnation of the 650C wheel, just
by a different name. Schwinn may have coined the S7 name later, but it was
the same size rim and tire.

The 650c designation for tri bikes is a misnomer, just as the 700c is for
modern road wheels, since it was supposed to have 40mm tires, too. But
there's absolutely no question the fat ones, which Schwinn called S7, are
the earlier version of the 571mm BSD tire.

 

[bfd]

"Hank Wirtz" <[email protected]> wrote in message
news:[email protected]...
> "Nate Knutson" <[email protected]> wrote in
news:1143944543.866292.205340
> @j33g2000cwa.googlegroups.com:
>
>
> >
> > I'm pretty sure they're quite a bit older than the modern incarnations
> > of them for tri and some small modern road bikes. I've seen references
> > to the French name system they're part of existing in the 40's,
> > although I don't know any more than that. The rwhole reason I brought
> > it up was to see if anyone knew which 571 actually appeared first. I
> > don't know for sure when S7 came out either.
> >
> Well, S7 is also known as 26x1&3/4, which works out to about 45mm. In
> reality, the tires were about 40mm. The 650 was supposed to refer to the
> outer diameter of the wheel. 571mm BSD + (40mm tire x 2 sides of the
wheel)
> =651mm. The S7 size _is_ the original incarnation of the 650C wheel, just
> by a different name. Schwinn may have coined the S7 name later, but it was
> the same size rim and tire.
>
> The 650c designation for tri bikes is a misnomer, just as the 700c is for
> modern road wheels, since it was supposed to have 40mm tires, too. But
> there's absolutely no question the fat ones, which Schwinn called S7, are
> the earlier version of the 571mm BSD tire.
>
Thanks for the info, didn't know about the *fat* 650c tires. One question,
so where do you find these fat 650C tires like 45-571 or 40-571 today?

 

[Hank Wirtz]

"bfd" <[email protected]> wrote in
news[email protected]:


>>
> Thanks for the info, didn't know about the *fat* 650c tires. One
> question, so where do you find these fat 650C tires like 45-571 or
> 40-571 today?
>
>
>

http://sheldonbrown.com/harris/tires/571s.html

Obviously, they won't fit on your Cervelo, since there's no room between
the stays or fork blades...

 

[Nate Knutson]

bfd wrote:
> "Hank Wirtz" <[email protected]> wrote in message
> news:[email protected]...
> > "Nate Knutson" <[email protected]> wrote in
> news:1143944543.866292.205340
> > @j33g2000cwa.googlegroups.com:
> >
> >
> > >
> > > I'm pretty sure they're quite a bit older than the modern incarnations
> > > of them for tri and some small modern road bikes. I've seen references
> > > to the French name system they're part of existing in the 40's,
> > > although I don't know any more than that. The rwhole reason I brought
> > > it up was to see if anyone knew which 571 actually appeared first. I
> > > don't know for sure when S7 came out either.
> > >
> > Well, S7 is also known as 26x1&3/4, which works out to about 45mm. In
> > reality, the tires were about 40mm. The 650 was supposed to refer to the
> > outer diameter of the wheel. 571mm BSD + (40mm tire x 2 sides of the
> wheel)
> > =651mm. The S7 size _is_ the original incarnation of the 650C wheel, just
> > by a different name. Schwinn may have coined the S7 name later, but it was
> > the same size rim and tire.
> >
> > The 650c designation for tri bikes is a misnomer, just as the 700c is for
> > modern road wheels, since it was supposed to have 40mm tires, too. But
> > there's absolutely no question the fat ones, which Schwinn called S7, are
> > the earlier version of the 571mm BSD tire.
> >
> Thanks for the info, didn't know about the *fat* 650c tires. One question,
> so where do you find these fat 650C tires like 45-571 or 40-571 today?

There's nothing special or rare about them. Any shop can get them. (In
the US at least - not sure about elsewhere). However, if
better-than-basic fat 571s have ever existed or are being made
somewhere, I have no idea what they are or where to get them.

 

[Werehatrack]

On 1 Apr 2006 04:36:54 -0800, [email protected] wrote:

>Im building a commuter with an older TREK frame. The frame doesn't have
>clearance for any more than 700x28 tires. I would like to use 32-35mm
>tires. Has anyone ever used 650c wheels on a 700c frame successfully?

That depends on your definition of "successfully". I've bought (and
scrapped out) bikes that had been subjected to field engineering of
this type, and they had obviously been ridden quite a lot. They also
had, in most cases, no vestige of brakes at all.

>How does braking work?

Via friction, to oppose wheel rotation.


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