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frame size

Old 04-02-06, 11:45 PM
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bikesrbetr
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frame size

i am having a problem with the search function, i'm sure this topic has been talked about before. i have rode a mountain bike for years. i am in the process of building/buying a fixed gear. i can't figure out what frame size i need. i am 5'6", though i do know this isn't the only factor i was wondering what other people that height were riding.
thanks
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Old 04-03-06, 12:01 AM
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measure how long your inseam is (from foot to inside of crotch) and multiply it by .67 to find frame size ~

around a 52/53/54 would be good. everyones leg length to body length ratio is different though so it depends on your legs mainly (if you want a perfect fit)
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Old 04-03-06, 12:48 AM
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According to Alex's method there, a 57cm frame would fit me. In reality, I ride a 53cm (for my road frame). Yes, he offered a disclaimer but you really can't go by simplisitic formulas when it comes to bike fit. The most important aspect to a proper fitting frame is the top tube length. You should also learn how the seat tube angle affects that. Seat tube length is basically irrelevant because obviously you're not going to buy the bike if you crush your nuts everytime you throw a leg over. If you need to get further away from your cranks, just raise the seat up (compact frame design has pretty much thrown the relevance of the seat tube length out the window). It's all about cockpit length (saddle position, effective top tube length, stem length, saddle-to-bars drop) and the total distance between the pedals and your ass (pedals, how you interface w/ them, crank length, seat tube length, seat post length, saddle thickness). People talk about proper position for the saddle in relation to the cranks (fore/aft) ... I don't have a damn thing to say regarding that one, other than people's opinions seem to differ quite a bit.

I doubt I told you anything useful at all there, but hopefully you'll come away w/ some new topics to do your own research on.

- eyefloater

PS. Don't use a stem shorter than 80mm.
PPS. In case this isn't obvious (it is though), I'm just another idiot spouting off on "teh interweeb." Hopefully someone with many more years of experience can chime in and provide some genuinely useful information for you.

Last edited by eyefloater; 04-03-06 at 12:59 AM.
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Old 04-03-06, 01:56 AM
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multiplying by .67, doesn't jive with bicycles that feature a higher bottom bracket. the reason being is that the seat tube is shorter to accomodate the same height. It is useful for pointing you in the right direction.

I have a 75cm inseam - so the formula recommends that I ride a 50cm. My IRO has a 46cm seat tube, but given the higher bb, Tony at IRO lists the size as an effective 50cm.

What's most important is your reach. Your toptube should be just long enough to allow you to be comfortable as upright as you tend to like to ride with a 90mm or 100mm stem. As you get more flexible, you can throw on a stem that is longer or that has a deeper drop. Being "longer" across the top of the bike is a good thing. Equally as important is the saddle fore/aft positioning, but that's something you figure out after the fact.

If there are 2 neighboring sizes of frames that you're trying to choose between, chances are that you can acheive the same fit on both, with different components.
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