Originally Posted by
R900
Any thoughts on sizing, I ride a 60 Trek Madone, that roughly translates to a 58 for many other bikes. I 've read to go small, but bigger (58/60) TT/Tri bikes are a bit rare around here so often difficult to test ride. Especially if I wanted a Cervelo, or something other then a Trek TTX.
IN GENERAL, people usually end up on a smaller frame for TT/Tri than their road frame. Most of it has to do with the shorter top tubes on the TT/Tri bikes-- My road bike has a 58cm top tube, and my P2C is 54cm IIRC. Makes sense if you think about it, since you're basically putting your elbows where your hands go on a regular roadie. I'm a rare case, though, and ride a 58cm CAAD8 and a 58cm Cervelo P2C.
If you use Competitive Cyclist's fit calculator, there's a TT/Tri calculator that you can link to from the main fit calculator page. Remember to be very precise in your measurements. That'll get you into the ballpark.