Road Cycling - Carbon seatpost and seatpost mounted rack

Does anybody know of seatpost mounted rear rack that is carbon freindly? I'm going to buy a Trek 2200 next week. While I was at the LBS I was looking for accessories to go with it. I asked about the racks and I was told it was not a good idea to put a rack on a carbon post. Anybody try it?

Thanks
str8shooter

Anybody try it?

I have a Topeak beam rack and have used it with my carbon post on my full-suspension MTB. I very lightly load it. I think 10lbs is about the most I'd put on it. I also only use it for picnic and coffee shop runs and very short distances. I would not recommend it for everyday riding and if you've got rough roads or thinking about going anywhere aside from pristine pavement, I'd suggest a frame mounted rack.

I have a Topeak beam rack and have used it with my carbon post on my full-suspension MTB. I very lightly load it. I think 10lbs is about the most I'd put on it. I also only use it for picnic and coffee shop runs and very short distances. I would not recommend it for everyday riding and if you've got rough roads or thinking about going anywhere aside from pristine pavement, I'd suggest a frame mounted rack.

...or a separate alloy seatpost with the rack attached to it. that way you can have the carbon for...uh....lookin' fancy, and the alloy for carrying stuff.

...or a separate alloy seatpost with the rack attached to it. that way you can have the carbon for...uh....lookin' fancy, and the alloy for carrying stuff.

It's not the material that worries me. CF when designed properly can withstand a higher load than aluminum. I however don't think any seatpost was really designed to be loaded in such a manner for prolonged periods. As a matter of fact, I think an aluminum post has a higher potential for failure under such loading than a CF one.

It's not the material that worries me. CF when designed properly can withstand a higher load than aluminum. I however don't think any seatpost was really designed to be loaded in such a manner for prolonged periods. As a matter of fact, I think an aluminum post has a higher potential for failure under such loading than a CF one.

i agree with you about the load-bearing qualities of CF, but CF seatposts are not known to stand up very well to clamping pressures. in a shop, it's generally a no-no to put a CF post in a work stand, with cushy rubber clamps and usually a rag over those...so, imagine a four-bolt bare aluminum clamp being torqued onto a CF seatpost by someone who wants it to be secure enough to hold 10lbs and doesn't have a torque wrench, or hands sensitive enough to tell when they've reached the a)maximum torque limit for the bolts, and b) the max. clamping pressure that the post can take. i have the same misgivings about this as i do with CF handlebars and thomson 4-bolt stems....waaay too much clamp, for really anyone.