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Old 12-05-07, 12:05 PM
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supcom
You need a new bike
 
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I think you will find that seatpost makers generally do not recommend clamping their racks to a carbon fiber seatpost. That's not to say that it isn't done, but there is a risk. Of course, you can swap out the seatpost to be safe.

Other than that, they work fine, though they are all fairly limited in max weight. Topeak's racks are very nice because their companion trunks slide on and off the rack in an instant without fiddling with velcro straps.

while the detours bags look nice, even the largest of them is limited to 5 lbs weight, according to the maker. 5 lbs?! Most seatpost racks will handle 20 lbs.
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