|How strong is a carbon seatpost?||Matno|
Mar 26, 2003 5:35 PM
|I'm wondering about touring loads. I have a pannier rack that only attaches to the seatpost. (Headlands Sport Utility X). Do you think my Easton CT2 carbon post would support it with a load of about 20-25 pounds? The rack supposedly will do 40lbs, but it would cost a lot more to replace the seatpost than the rack so I don't want to take unnecessary chances!
Also, is there much possibility of such a rack having an effect on my CAAD4 frame? It doesn't seem likely since the frame will easily support a rider who weighs a lot more than my 140, but my weight pushes mostly straight down whereas the rack torques a little more.
|Very strong in certain directions, not strong in others...||PdxMark|
Mar 27, 2003 8:36 AM
|I suspect your pannier rack will be putting a torquing load against the seat post. That's not a direction the post is meant to be strong in. In addition, the 20-25 pounds will put greater loads at the edges of the clamp (on the seatpost), particlaurly has you hit cracks in the road. I'd get a cheap strong alloy post for touring.
The frame will be way, way fine.
Mar 27, 2003 8:40 AM
|I have no evidentiary basis for this, but I wouldn't try attaching anything like that to a carbon post. I'd get a cheaper aluminum, maybe ti, post and substitute that for touring. If nothing else, it may save the finish of the expensive carbon post.
You can get a cheap aluminum post at Performance for about $9, and they work fine (I have two).
Mar 27, 2003 9:22 AM
|I guess I'll just "borrow" the aluminum seatpost from my mountain bike. I just realized that they are the same size (my old road bike had a 26.6mm post, so I was thinking it might be a pain to find a cheap spare, but the new C'dale is 27.2). Plus, the seatpost on the MTB is already scratched up... :^)
Thanks for the heads up.