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Cervelo TT bike sizing(6 posts)

Cervelo TT bike sizingnazgul
Oct 29, 2003 11:34 AM
I've been playing with the idea of building a dedicated time trial bike and am looking at Cervelo. I am pretty confident sizing a regular road bike, but obviously there are differences. At 6'0", 88cm inseam, I usually ride smth with a 57cm TT, 110mm stem and 57-58cm ST. So here are some questions:
* if you have a TT bike, what seat tube angle do you ride? Cervelo supposedly can be varied from 74-79. I know triathletes favor steep angles because they seem to help the run leg, but I plan on using it for time trials exclusively.
* Do you typically go for a shorter or longer toptube/stem on your TT rig compared to your roadbike?
* If you happen to ride a P2k or P3, would you think a 55 or 58 would be more suitable for me?
re: Cervelo TT bike sizingJon Billheimer
Oct 29, 2003 11:50 AM
Cervelo says to go with your standard road bike sizing. From what you describe I'd go with their 58 cm. size. What effective seat tube angle you set the bike up at is going to depend on how aggressive you want to get with the drop from seat to handlebar. Obviously the more aggressive your position the farther forward you're going to have to get with your effective seat tube angle, in order to preserve your hip angle/pedalling power. Also, whether the racing you do is done under UCI rules, since UCI has the 5 cm set back rule with respect to the saddle's setback from the bb. It might be a good idea to e-mail your measurements to Cervelo for their advice.
... I must have the weirdest inseam on the planet...Akirasho
Oct 29, 2003 7:34 PM
...93cm inseam generally puts me on a 58 to 60 cm frame depending on top tube and head tube lengths (long arms, but shorter than normal torso)... so I went with a 60cm P2K... and it's like a glove (130mm stem).

Indeed, when an opportunity arose to purchase a GT Vengeance frame, some of my sizing concerns were eased by comparisons 'tween the P2K and the GT frame (GT has a shorter head tube which puts me in a more extreme aero tuck... but otherwise, geometries are quite similar)

I run the P2K with the post in the forward position (used for TTs)... but have never bothered to measure for UCI compliance.

Be the bike.
re: Cervelo TT bike sizingfeathers mcgraw
Oct 29, 2003 1:20 PM
I'm 6' with a 82cm inseam. My road bike has a 57cm top tube and a 12cm stem. I have the 55 P2. The top tube is 56cm center to center, and I have a 11cm stem on it. I can't tell you the STA, but the reversible head on the post is in the rearward position, and the saddle is pushed all the way forward. Since my torso is longer than yours, I'd guess you should go for the 55 instead of the 58, but this all depends on the STA you'll be riding. Hope this helps.
Another vote for the 55cmasgelle
Oct 29, 2003 2:52 PM
I'm also 6' aand ride a 58 cm frame with a 58.5 cm top tube. I used to ride a GT Aero Edge TT bike and recently got a Cervelo P2k. Both have a 56 c-c top tube and fit very well. Most people I know go down one frame size for their TT bike.
Cerveol soloistSkooter
Oct 30, 2003 2:16 AM
I have a long torso and short legs. I ride a 58 soloist. My 79 inseam work really well. I use a Syntace large and with the flip of the seatpost I am In a great TT position with the standard gear on the Soloist. The bike in the road position is the best bike I have ever ridden. In the TT position it is not as great as the P2K, but for on bike you can't miss. It is a great bike and even if I didn't need a TT bike this is still the bike I would use. It is a missle. I love it a look forward to getting a P3 for TT exclusive. No worries Skoots