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Old 12-09-08, 02:43 PM
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cobrabyte
one life on two wheels
 
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it all has to do with the geometry of the frame....many newer frames have sloping top tubes & this is why you may see some extra seatpost.......or people dont get the right size bike for themselves..... or they think having their ass way up in the air is "aero"

your most important measurement should be the top tube, not the seat tube. measure the top tube on your bike now (if it's comfortable for you) & get one with a similar measurement, the seattube should be pretty close to what you need if the toptube length is right. your LBS can also help you out with this as well, but make sure to buy something when you go in (like a tube, or gloves) they will help a customer more than a dude coming in for free advice.

good luck
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