Triathlon - TT Frame help

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rjjasick
08-13-05, 04:07 PM
I'm looking at building up a TT Bike this winter and have a few questions about sizes. I've been pro fitted for a road bike and have my size there, but is there a difference when it comes to TT bikes? I would think that you would want a longer top tube than on your road bike so you can lay out farther? So in that logic, say if I have a 53 Road bike, a 55 or 56 might be a good size for a TT? Am I way off here?

chrisesposito
08-13-05, 05:59 PM
Hi,
Based on several articles on Tri bike geometry and fit I read over at slowtwitch.com, you have it backwards. If I understood the articles correctly, top tube lengths on these bikes tend to be shorter than a road bike.

see http://www.slowtwitch.com/mainheadings/techctr/techctr.html for more details.

Chris
cjbruin
08-13-05, 07:14 PM
Chris is correct. You need a shorter top tube because your hand position on the tri/tt bars is further past the head tube than on your roadie.

rjjasick
08-13-05, 09:04 PM
Thanks guys, I started reading the post Chris has and it's very helpful. I'm not really looking for Tri's really, but I'm looking more for Time Trial Specfic. I don't need to save my legs like you guys. Looks like I'm going to need a smaller bike. Oh well! I was looking to save my old road bike that was too big to start with. Yeah! Bike shopping again.