Legs; OK! Lungs; not!
Join Date: Apr 2009
Location: Coral Springs, FL
Bikes: ''09 Motobecane Immortal Pro (Yellow), '02 Diamondback Hybrid, '09 Lamborghini Viaggio, ''11 Cervelo P2
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Sounds like it might work. Common wisdom suggests a slightly smaller TT bike vs a road bike. One reason is that most TT/Tri events are shorter than typical road rides, so it's easier to put up with the discomfort. Also the cramped cockpit keeps you in a very aggressive aero position, and the frame weighs less than a larger frame, but weight is usually less of a problem in a TT/Tri bike.
The real key is to ride the bike for about an hour. Of course that assumes it's been kinda dialed in for you.
Competitive cyclist .com has a great tool for an initial fitting. You have to do 9 measurements, and you need the assistance of another person. You plug it all in, and choose Road or TT bike, and then it spits out 3 sets of measurements for 3 different fit types.
I got a good deal on a 58 cm Fuji 1.0 frame and built a TT bike based on it. It's a bit bigger that I would like, but is pretty close to the "French Fit" that Competitive Cyclist recommends for my size.
I TT/Tri bike properly fit can be very fast, about 10 - 15% faster for the same effort as a road bike. Most is due to the aero positon, but also (for a true TT frame) due to the more upright and forward seat position and "slammed" stem position.
Hope this helps.