Bikes - TT vs Tri

http://www.bikeforums.net/archive/index.php/t-62514.html

From another source, found on this site - http://www.cyclingforums.com/showthread/t-48007.html
Quoted:
"
That's interesting. I emailed Quintana Roo about that very question and I received the
following response:

"Concerning the distinction between a time trail bike and a triathlon bike. You will notice that
there is a great deal of similarity between the time trail positioning and that for triathlon.
Typically a tri bike incorporate a steep seat tube angle into the fit, with that measuring
76.6 degrees to 78. While a time trial bike will not usually go further than 76.5. The lower the
seat tube angle, the more stable of a bike. Also more effective for exclusive for TT use. You
will notice that all of QR's tri bikes in a 700c wheel size have a seat tube angle of 76.5
degrees, and the 650c wheels using the 78 degree geometry. One may tend to think that the 700c
bikes would then be usable for TT. This is correct in some respects. Typically TT bikes will have
a longer top tube than those used in QR's line. The longer top tube will allow you to attain a
more aero dynamic position, but will sacrifice comfort. So if you're looking for a more
comfortable TT bike, a QR would be great. I would suggest the Tiphoon or the Caliente for
starters, with regards to each bike being light weight and torsioally stiff."
"

Edited by 1stTimeTri 2007-07-12 9:16 AM

Effectively, there is no difference between a TT and a TRI bike, they use the same frame geometry.  A true, flat out TT bike may be set up differently than a TRI bike meant for going longer distances, but for our intents and purposes here, there really is no difference.  Road bike/Tri bike differences...ok now THERE is a subject with a longer answer!

Same thing, a time trialer may be able to get more aggresive with their position as they don't have to run afterwards. But besides that both want the same thing from their bikes, so we will use the same bikes.