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Differences between a Tri bike vs. a TT bike?(6 posts)

Differences between a Tri bike vs. a TT bike?TJohn
Aug 24, 2001 11:20 AM
Hi all,
I posted this on the Triathlon board but I didn't get any responses. I guess there aren't that many Tri guys around this site. Anyways, I was wondering what is the diff between a Tri bike w/ 700 wheels and a Time Trial bike? I know some of the TT bikes these days look funky with the forward sloping top tubes, but compared to the traditional diamond shape TT frames I can't really see a difference. My guess is that the seattube angle is steeper on the tri bike?? If that is the only real significant difference, then I ask why is there a need for that difference?? It seems to me that TT and Tri road races are the same beasts.
I'm not an expert on this matter, but...MrCelloBoy
Aug 24, 2001 11:30 AM
I think you're right that thy're basically the same. Watch, now a tri expert is gonna flame me!

Some Tri bikes I've seen even have both wheels 650c for lower profile (and faster acceleration?).
re: Differences between a Tri bike vs. a TT bike?Mel Erickson
Aug 24, 2001 11:33 AM
They're similar and many tri racers use time trial bikes. The main difference is comfort. Racers who do longer distance triathlons (Ironman class) are concerned about comfort on the bike because fatigue plays a big part in these races. They want to be aero, just like a time trialist, but they also know most races are won on the run. They don't want to beat up their bodies on the bike portion so you see Ti, Softrides, etc. for tri bikes. Shorter triathlons don't pose the same problems and more traditional TT bikes are often seen in these races.
the Similarities are Differentmee
Aug 24, 2001 12:01 PM
so there
Aren't the rules of the sanctioning bodies different?Spoke Wrench
Aug 24, 2001 1:56 PM
This is an area that I have only moderate interest in, so I almost didn't respond at all.

It seems to me that I've read that racing bicycles have to meet certain criteria - minimum weight, same size wheels, must have a seat tube, can't have streamlining, etc.

It looks to me like the rules for triathlons are a bit more liberal.

There has to be a more race oriented guy here who knows for sure.
re: Differences between a Tri bike vs. a TT bike?fuzzybunnies
Aug 24, 2001 8:25 PM
From what i'm to understand from my couple of attempts is that a tri bike usually features a more foward seat tube to allow the rider to get into an aero position comfortably. Part of the reason for the profile seatpost that angles foward for non tri bikes. Not certain about headtube angle. Someone else will hopefully know more. TTFN