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Old 06-05-09, 07:43 AM
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Bike frame advice

Hi, Im looking for advice on how to tell how fast/good a frame is from it's dimensions.

Please help.
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Old 06-05-09, 08:10 AM
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Fast/good for what purposes? MTB, road, track, tri?
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Old 06-05-09, 08:14 AM
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Fast/Good for road / commuting / touring
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Old 06-05-09, 08:15 AM
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If the frame fits your dimensions, then it will be fast.
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Old 06-05-09, 08:20 AM
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Originally Posted by bmnaut
Fast/Good for road / commuting / touring
There is no frame that could be recommended as good for all three of the above purposes. Fast road frames don't have mounts/clearance for fenders or racks and lightweight frames suitable for commuting are not suitable for loaded touring too. Once you find a frame suitable for loaded touring, it will be much too heavy to be considered a fast road frame or even a fast commuter. You are going to need to compromise somewhere.
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Old 06-05-09, 08:47 AM
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Fine, commuting only then. And consider my size/weight to be an independent variable to come up with a formula.
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Old 06-05-09, 08:54 AM
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Originally Posted by bmnaut
Fine, commuting only then. And consider my size/weight to be an independent variable to come up with a formula.
A bike that fits you quite well MAY be fast ... if you have the cardiovascular system and the muscles to move it quickly.

A bike that does NOT fig you well will be very difficult to move at any great speed, for any great length of time, virtually without regard to your conditioning.

If you're looking to get some quantitative information on how to fit a bike, you may want to start here:

https://www.cyclemetrics.com/Pages/Fi..._fit_links.htm
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Old 06-05-09, 10:17 AM
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Originally Posted by bmnaut
Fine, commuting only then. And consider my size/weight to be an independent variable to come up with a formula.
Is this 20 questions?



Formula? You want a formula to find a "fast" bike?

the only one I know is e=mc squared.

For your purposes though..... it's all about wheels. Good wheels, low resistance tires. Put these on any frame and you'll go fast.
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Old 06-05-09, 11:41 AM
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For a fast commuter, find the lightest weight frame you can that can fit 25-32mm tires plus fenders, has eyelets for a rear rack, and is designed to take drop bars (road or cyclocross frame). Build it up as light as you can.

I'd recommend a Gunnar Sport as a starting point.
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