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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 06-30-12, 01:42 PM   #1
ddmann
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Can a seat post carrier by mounted on a carbon seat post?

Heading for a short trip next week and am wondering about the safety of this set up. The bag will likely weigh in at less than ten pounds. The bike is a Robaix (no vintage this trip).


Not too sure if it is a wise idea, so fill me in folks.
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Old 06-30-12, 02:40 PM   #2
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Conventional wisdom has always been not to clamp anything to a carbon seat post. At least that is what my LBS told me when I bought my bike that with a carbon post. That said, many post have a metal core, so It might be all right. A metal seat post is fairly inexpensive insurance just to be sure.
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Old 06-30-12, 04:39 PM   #3
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Originally Posted by ddmann View Post
Not too sure if it is a wise idea, so fill me in folks.
Read the owner's manual for your rack. Most say specifically that the rack should not be used with a carbon fiber seat post.
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Old 06-30-12, 07:54 PM   #4
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Most owners manuals will say not to (they're written by lawyers). I've used one for years, since about 2003, on a carbon seat post. In fact, I've done 6 1200km randonee's using that setup. It can be done safely if you are careful and take a few precautions. First, make sure you have a plastic schimm between the metal rack and the seatpost. Sharp edges are a bad thing. Second, don't over tighten it!!!! Tighten it just enough so that it doesn't move easily, about the same torque as your seat clamp should be safe. Finally, don't put too much weight in your bag.

If you are at all worried about it go buy a cheap aluminum seatpost and problem solved.
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Old 06-30-12, 08:01 PM   #5
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.. That said, many post have a metal core, so It might be all right. ...
Those aren't true carbon seatposts (like the one on his Roubaix). You are right though, there are a lot of people out there who think they have carbon seatposts but they really don't. If you have one with an aluminum or steel core a seatpost rack is not an issue.
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