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Old 11-07-07, 11:59 PM   #1
FazeOne
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650c Wheels on a 700c fork?

Can you run 650c wheels on a 700c fork.
I was thinking of building a bike for my girlfriend but since she is pretty small she would probably need smaller wheels. Also if you cant run 650s on a 700 fork, then can you replace that fork with 650 fork? or will it effect the geometry of the bike?
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Old 11-08-07, 12:27 AM   #2
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You wouldn't be able to use the brakes, and your girlfriend might be fond of being able to stop. You can change the fork out, but that will change the geometry drastically. You would really be better off finding a bike that's her size. If she is really small (like under 4'10") they make bikes with 650 wheels as well.
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Old 11-08-07, 08:59 AM   #3
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Rivendell specializes in 650b conversions and they have the extremely long reach brakes that you'll probably need.

http://www.rivbike.com/
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Old 11-08-07, 10:40 AM   #4
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If she's that small, I'd consider getting a special frame, like a Terry. I don't think you're going to gain that much going from 700c to 650c.

Just looked it up, 700c is 622 mm, 650c is 571mm. Figure that your dropping the bike half of the difference (51 mm), which works out to a 25.5 mm drop in height. Which, for the metric impaired like myself is.... 1 inch. Not worth it, especially considering the rarity of tires and tubes. And rims.
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Old 11-08-07, 04:29 PM   #5
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My 5' 1" wife went from a 50cm frame 700c bike to a 47cm 650c bike and she said it was the best thing I've ever done for her (makes me wonder).
The big advantage that a 650 bike has for smaller people is that it allows for a shorter tip tube and less reach to the bar. 700 wheels limit the length of the top tube which creates too much reach for people with shorter torsos. Women often have longer legs and shorter torsos than men. A bike with 650 wheels is the best place to start with smaller women.
The bigger bike companies are now building women specific bikes (WSD) with 650 wheels in smaller sizes and 700 wheels in larger sizes.
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Old 11-08-07, 05:05 PM   #6
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http://boston.craigslist.org/bmw/bik/469111782.html

This fellow has a frame and wheelset forsale that sounds like a nice project for your wife's bike.
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Old 11-09-07, 09:13 AM   #7
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That is a good deal.
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