Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

used bike sizing

Old 07-20-06, 03:43 PM
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Funkdeal
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used bike sizing

i plan on buying a used road bike soon. How will i know if a lot of the older bikes will fit me? i'm 5'10 with an 87.5cm inseam. which numbers should i be looking for? thanks.
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Old 07-20-06, 04:01 PM
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54 or 56 cm frame might work. The big thing will be the top tube length. I'm an inch taller than you, but with a similar inseam. A 54 cm top tube works quite well for me. THe best thing to do is go to a bike shop, ride some different sized bikes, then get the dimensions of the one that feels the best. Make sure you record the stem size as well...
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Old 07-20-06, 04:19 PM
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Originally Posted by pinkrobe
54 or 56 cm frame might work. The big thing will be the top tube length. I'm an inch taller than you, but with a similar inseam. A 54 cm top tube works quite well for me. THe best thing to do is go to a bike shop, ride some different sized bikes, then get the dimensions of the one that feels the best. Make sure you record the stem size as well...
doesn't it depend on the maker of the bike though? i only ask because one bike company suggested a 57cm frame, while another company recommended a 53cm frame. I assume that their suggestions are so far apart because their frame geometries are different. any more suggestions for used bike shopping? thanks.
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Old 07-20-06, 04:28 PM
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Most companies will have a geometry chart that will say what the dimensions of the frame are for a given size. If the bike has a sloping top tube, the maker will often list a measurement called "effective top tube" length that should allow you to compare that bike to others. You're right though, one maker's 57 could fit similarly to another maker's 53. That is why you need to get out and ride a bunch of bikes and figure out what works best for you. When you have a solid idea of what will fit [especially with regard to top tube length], then it makes it much easier to shop online or simply throw a leg over a bike and "know" that it will work.
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Old 07-20-06, 09:45 PM
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in general I like to get center to center measurements. For some reason, some companies started measuring their bikes center to top during the carbon fiber and aluminum craze, and now they're back to their senses. Seat tube, top tube, and distance from seat to handlebar are important measurements, the latter being adjustable even after you buy the bike.
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Old 07-20-06, 10:23 PM
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Your age, flexibility, tolerance for pain, and riding style are as important as your height and leg length. A guy of 5'10", on a traditional frame with a horizontal top bar could ride a size 55 in crit racing, 56 in stage racing, 57 for commuting and recreational riding, and a size 58 for relaxed touring. The taller frames provide a higher, more comfortable position, the shorter frames make it easier to obtain an aero position, as well as pain in the hands, wrists, neck and back.

Because there are four different ways to compute a bike's size, the only measurement that you can trust is standover. Measure the standover an inch behind the stem, from the top surface of the top tube down to the ground. The standover should be about equal to the inseam on your slacks. So, in my case, my leg length is 34 inches, my slacks inseam is 32 inches, and any traditional road bike with a standover of 32 inches or 32 1/2 inches, fits me well, regardless of the size that is advertised.
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Old 07-22-06, 01:51 AM
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Use both these sites and it will narrow your search

http://www.wrenchscience.com/WS1/Sec...ing/Height.asp

http://www.competitivecyclist.com/za...LCULATOR_INTRO
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