Originally Posted by
CACycling
Actually, the weight is supported by the axle in the dropouts. The skewer simply holds the dropout against the lock nut on the axle. I have seem racks that mount to the seat stays
http://www.niagaracycle.com/product_...oducts_id=1547
which, combined with the seat clamp could be a good solution if you did something to protect the carbon where the clamp is at.
I don't think it would a good solution - the carbon is pretty thin on the stays, to. And the stays are designed to handle weight pushing down on them, not pulling back on the. At least the rear brake mount is designed to take weight there (when braking).
A mount to the seat post, on the other hand, has at least 2 advantages:
1. The seat post is designed to handle the weight and bumps from the rider sitting on it, and the frame is designed to handle the seat post being pushed or pulled backwards by a lot of weight.
2. If I did something wrong, I'd much rather break my seat post than break part of the frame. :-) A lot less expensive to replace the seat post... :-)