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TT bike specs(3 posts)

TT bike specsSLB
Jun 19, 2003 9:23 AM
Hi, I'm been thinking about a TT bike for a while and have a few questions about fit. I've been doing TTs on my regular bike with clamp-on bars. My bike is 56cm top tube with a 12cm stem. I use the profile jammers. In order to make everything fit, I have to lower my seat, slide it forward and tilt the nose slightly down.

Can anyone give me some general ballpark advice about what size TT bike I should be looking for in terms of top tube length? thanks
re: TT bike specsbrider
Jun 19, 2003 9:59 AM
This is going to vary a lot depending on head tube angle, torso length (which we have a clue to based on your given road top tube length), seat tube angle, flexibility, and forearm length.

Strive for a 90 degree angle between your thigh and torso at bottom of the pedal stroke, and a 90 degree angle between your torso and upper arm when on the extensions. A good fitter should be able to determine the best geometry based on these things coupled with your comfort (flexibility).
re: TT bike specs, and fit guideTime Trial dot org
Jun 19, 2003 3:36 PM
read the Slam article on for fitting info.

It sounds like you should slide the saddle back and raise it a bit possibly but I cannot tell.

If you live in the SoCal area I reccomend being fit by Dave Bunce of Bicycle Sports Encinitas.