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Adjusting saddle on a GT Vengeance frame(6 posts)

Adjusting saddle on a GT Vengeance frameAndy
Aug 3, 2001 9:01 PM
Does anybody know how to adjust the saddle height and angle on a GT Vengeance frame. This bike does not use a standard seat post and I do not have a manual detailing the correct procedure to follow.
re: Adjusting saddle on a GT Vengeance framealansutton
Aug 4, 2001 10:49 AM
Shim it.
re: ...what a coinkydynk...Akirasho
Aug 4, 2001 2:43 PM
... first, you need a loooooooooong 5mm allen wrench.

I just started building up a Vengeance frame this weekend. I'm imaginining that adjustments are going to be a bit of a pain... but the price you pay for an aero proprietary seatpost (I've also got a Cervelo P2K... and comparatively... it's a cinch!).

Height is adjusted by loosening those three 3mm setscrews in the front of the frame seatmast extension. You just need to loosen them... don't remove all three unless you want to fish out the threaded backing post. I'm unsure of the proper sequence for retightening... but I believe that you start with the lower and work up...

Angle is the tough one. You'll have to loosen the fore and aft clamps (which is why you need a long 5mm allen) from inside the seatpost column... then... it'll be trial and error for saddle angle and fore/aft position. To it's credit... it should result in a very solid mount once you've dialed it in.

Good luck, wish me luck and...

Be the bike.
It worked... it was a snap!Andy
Aug 4, 2001 3:07 PM
Thanks for the info. After I loosened the three allen bolts the entire assembly slid right off. You are right about the long allen wrench. I figured out that you cannot loosen/tighten the front seat clamp. You have to remove the seat and then spin the front seat clamp to move it up or down on the bolt... then put the seat back on and tighten only the rear seat clamp. Put the assebmly back on the bike and try it. It took me three tries to get it dialed in. It's a snap once you figure out how it works. My "seat post" fits perfectly when it's all the way down so I don't need to use the rubber boot.
I took it out to the time trial course at noon and took 13 seconds off my best time.
Congratz and congratzAkirasho
Aug 4, 2001 3:21 PM
Congratz on successfully dialing everything in and congratz on your new PR!

BTW, what size frame do you have? Mine is a 60cm but uses 650C wheels... what a sight!

Be the bike.
Aug 4, 2001 9:26 PM
Mine is a medium, I'm not sure what size that translates to. Yep, I've got 650 wheels... Zipp 404 on the front and a Falcon Sports disc wheel on the back. Except for the frame, I purchased almost all the parts from people on this web site. I was able to get everything for about $900. The stem and the saddle are pretty crummy but I can always swap them out later.

I should take a picture of it and post it... since the parts came from the people that post here.