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700 cc wheels on a 47cm bike??(4 posts)

700 cc wheels on a 47cm bike??jethrobodeen
Aug 12, 2001 1:09 PM
My friend is thinking of getting a custom frame with 700cc paired on a 47 or 46 cm frame. The builder (some guy in Mill Valley) swears there will be no toe overlap. What is the big advantage of 700's vs 650's anyway? Thanks!
re: 700 cc wheels on a 47cm bike??Rusty Coggs
Aug 12, 2001 4:43 PM
700c are the 'normal' road size.650s are making something of a comeback due to use on several makers WSD lines.In 700c, tires,tubes and wheels may be easier to find depending on where you are. Probably greater selection too. One potential problem on a bike that size with 700c is too long a top tube and too slack a headtube angle in order to clear the bigger wheel.
re: 700 cc wheels on a 47cm bike??jtolleson
Aug 13, 2001 7:49 AM
Trek has always offered a 47 cm frame with 700cc wheels; in fact I think it has always been their "smallest" without dropping to 650cc wheels/WSD, etc. Two women in our club ride that size (one on a 1998 1220, and one on a 99 2120 carbon... I don't know about any of the higher end frames) and have never complained about toe overlap.

I think if one can avoid 650 wheels, so much the better (which is why I have NEVER understood Terry putting a 650 cc front wheel on a full size bike... she's so busy being "different" and overcharging for her mediocre steeds that I suppose she expects buyers to overlook the inconvenience)
I agree with RustySpoke Wrench
Aug 13, 2001 4:08 AM
650c wheels are a somewhat uncommon size so replacement parts will be a little more difficult to get, but should still be "findable."

Assuming your friend has normal porportions, the frame builder has a number of choices: longer than desirable top tube, slack head tube, steep seat tube, smaller front wheel, or live with toe overlap. I'd want to find out exactly how the frame builder plans to solve the handlebar reach issue before I committed my money.

A friend and customer of mine, who is 6'7", wanted a new frame so I put him in touch with Lenard Zinn, who has made a spacialty of building large size frames. I wonder if there is a custom frame builder who specialzes in small frames?