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Thread: Bike sizing

  1. #1
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    Bike sizing

    I have been looking to buy a road bike, I have been commuting for 4 months now and am looking for something more efficient than my hardtail. I am 5' 7" , I need help finding my bike size. I am looking for an older bike, that is being discussed in C+V. Here are some pics, this bike is 57cm. Standing over the bike, I can lift it about 2". In these pics the seat could have been raised 1/2-1 inch. I am the wirey fellow on the bike [IMG]
    Last edited by busted knuckles; 11-29-11 at 10:22 PM.
    "harder" is not a very good safeword.

  2. #2
    Older than dirt CCrew's Avatar
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    That bike sure doesn't look to be 57cm. Looks smaller. If your left foot is on the ground in those pics, you're right, that seat needs to go up, but I'm betting more than you think.

    That said, ,it doesn't look like it's a terrible fit, I just think it's smaller than 57cm. Heck, I'm 5'9" with a 32" inseam and I ride a 55cm and am stretched out.

  3. #3
    Galveston County Texas 10 Wheels's Avatar
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    Nice looking bike.
    I started on a Nishki Sport.
    It is a good riding bike,
    Rode it 1500 miles.

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    The bike in the photo appears to be a good size for you. Of course, you can fine tune your fit by raising or lowering the saddle or stem, or using a longer or shorter stem.

    A perfect bike fit comes from trial and error. If you ride everyday and try slightly fits, you eventually find a fit that is comfortable for both short and long rides. Take measurements of your fit so that when you have the "perfect" fit, you can easily reproduce that fit on any of your bikes.

    The "fit" that works best for me is to have the saddle 29 1/2 inches above the center of the crank bolt, measuring along the seat tube and the seat post. The best cockpit size for me (measured from the back edge of the saddle to the front edge of the stem) is 31 inches.

    I currently have bikes that range in size from 56 to 62. All of them fit me perfectly, and all are equally comfortable: they all have a saddle height of 29 1/2 inches and a cockpit length of 31 inches.

    In your case, the photos suggest you could get a good fit with any road bike with traditional geometry in the size 54 to size 58 range, simply by adjusting the saddle and stem positions.

  5. #5
    Senior Member bhop's Avatar
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    I am 5'7" and my bike is a size 50 (jamis aurora).. i don't think that bike in the pic is a 57 if you're the same height as me... unless old bikes have different sizing? dunno..

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    You don't want your right leg any straighter than that so the saddle height is fine.

    It would be better to not lock your elbows. After a while, you'll be sore in the neck, shoulders, back.

    You could raise the stem a bit. There is a minimal insertion line on the stem; you don't want to see that. Then you could have some bend in your arms without lowering your head and back.

    Or, move the saddle forward a bit. That may change the height of the saddle over the cranks a touch so you may have to raise the saddle. Make small changes, one at a time, until you've dialed in the fit.

    Otherwise, the bike seems to fit you pretty well.

    If no one has told you already, those brake levers you can pull while your hands are on the top part of the handlebars do not work very well. Fine for just tooling around but don't trust them for quick stopping.

  7. #7
    Older than dirt CCrew's Avatar
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    Quote Originally Posted by bbattle View Post
    You don't want your right leg any straighter than that so the saddle height is fine.

    .
    I have to respectfully disagree. There's no way to 100% judge that since the left foot is on the ground. The fact that he's able to flatfoot the left foot without visibly leaning over says something's amiss. It could just be the visual of the picture.

    And trying to judge a proper fit with a pair of workboots is marginal unless they're going to be used to ride..

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