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NEWBIE: 650c vs 700c(7 posts)

NEWBIE: 650c vs 700causmultisport
Dec 17, 2003 12:56 AM
hi guys, just wanting a bit of info on this issue. at the moment i'm riding a 650c bike, and am looking at something new. i'm a ironman competitor, i assume that would make a difference? any help would be EXCELLENT!!!!!
re: NEWBIE: 650c vs 700cSaddle_Sore
Dec 17, 2003 1:57 AM
I'm a bit confused. Are you riding Reynolds tubing? If you are a steel devotee then you might want to check out an 853 frame - these are pretty bloody good.

I'm riding a "classic" 531c frame which is the equivalent of a 631 on the current line up and it hasn't given me any problems.

http://www.reynolds-cycle.com/X-100.swf

^ More information.
re: NEWBIE: 650c vs 700cTmw
Dec 17, 2003 2:30 AM
650c & 700c are wheel sizes and when my gf bought a bike recently we talked about this as she is quite short (some women specific bikes come with 650c wheels). The guy in a tri shop we looked in said they'd always stock some 650c stuff (for tri bikes & people) but really you get a better choice of tires for 700c.
Hope this is useful
Toby
I'm a little konphuzed by the ''question''...Akirasho
Dec 17, 2003 6:01 AM
... are you speaking specifically about the wheelz??

http://www.slowtwitch.com/mainheadings/techctr/geometry.html
http://www.slowtwitch.com/mainheadings/techctr/techctr.html

Be the bike.
Technical argument?orange_julius
Dec 17, 2003 7:23 AM
I was wondering the same a while back. Some people say
that 650c wheels are smaller, thus has smaller resistance,
and you can accelerate on it faster because of the smaller
rotational mass.

But to cover the same distance on a 650c wheel, it has to
rotate more times than a 700c. The same applies to speed.
And as far as I know, the biggest resistance comes from
the blades/spokes.

So it sounds to me that 650c wheels are no good, and that
if you really want improved TT performance you should go
with disk wheels, not smaller wheels.

That is, unless you don't fit on a 700c bike somehow.

Any comments?
Technical argument?ClydeTri
Dec 17, 2003 10:13 AM
It also has to do with geometry, placement of the body given they will be on the aerobars in triathlons. There are many variables, if you are under 6ft tall, 650s might work , over 6ft tall, probably not.
Arguments about Wheel Sizecyclist of all trades
Dec 17, 2003 4:55 PM
There are many opinions and scientific arguments that you will find on this subject. the fastest bikes(lowracer recumbents) on the planet often use 20" wheels.

I do not believe you will find much of a speed difference between 650c and 700c wheels. Generally, 650s accelerate faster, are lighter, and present a smaller surface area to the wind. while 700s have less rolling resistance and are more common.