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Thread: Bike sizing

  1. #1
    ROOKIE!!! sen2two's Avatar
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    Apr 2011
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    Bike sizing

    Im looking at a quintano roo I found on CL for a sweet deal. It's posted as 20" for the size, which is around a 50cm? From what I read I should be riding a 54cm.

    I'm 5'9" tall with a 32" inseem with my shoes on. Is this bike to small for me? The original owner is 5'8" tall with a 30" inseem and was professionally fitted. Seems close enough that the seat height and handle bar height could be adjusted for a good fit?

    Any help here would be great.
    Just ride.

  2. #2
    Legs; OK! Lungs; not! bobthib's Avatar
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    Sounds like it might work. Common wisdom suggests a slightly smaller TT bike vs a road bike. One reason is that most TT/Tri events are shorter than typical road rides, so it's easier to put up with the discomfort. Also the cramped cockpit keeps you in a very aggressive aero position, and the frame weighs less than a larger frame, but weight is usually less of a problem in a TT/Tri bike.

    The real key is to ride the bike for about an hour. Of course that assumes it's been kinda dialed in for you.

    Competitive cyclist .com has a great tool for an initial fitting. You have to do 9 measurements, and you need the assistance of another person. You plug it all in, and choose Road or TT bike, and then it spits out 3 sets of measurements for 3 different fit types.

    I got a good deal on a 58 cm Fuji 1.0 frame and built a TT bike based on it. It's a bit bigger that I would like, but is pretty close to the "French Fit" that Competitive Cyclist recommends for my size.

    I TT/Tri bike properly fit can be very fast, about 10 - 15% faster for the same effort as a road bike. Most is due to the aero positon, but also (for a true TT frame) due to the more upright and forward seat position and "slammed" stem position.

    Hope this helps.
    '09 Motobecane Immortal Pro, with lollipops
    '09 Fuji Aloha 1.0 TT build. with lollipops
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    "Oh, to be 60 again!"

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