Join Date: Jul 2008
Location: Johnston City, IL
Bikes: Specialized Sirrus 08
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You might be able to "fudge" on a size up or down, but it really depends on what style of riding you do (uprights, racing, laidback, ect). And it has to do with how you r body height is dished out, ie are you long or short legged or torso.
I would say how the bike fits around you is more important than just one measurment. So be sure to test ride all bikes.
And good luck, used bikes are the best bang for the buck!