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Use a Hacksaw on a Carbon Seatpost?(3 posts)

Use a Hacksaw on a Carbon Seatpost?cincy1
Aug 28, 2001 3:40 AM
I just purchased a carbon fiber seatpost. It is very long and my legs are very short. I'd like to trim the excess post before installing it. Are there any rules for how much seatpost you should leave inside the tube? Is it a multiple of the amount exposed above the tube? Are there any tricks to cutting carbon fiber? Will a hacksaw fray the ends and cause it to unravel like fiberglass? Should I quit being a weight weenie and just leave the post as is?
re: Use a Hacksaw on a Carbon Seatpost?TJeanloz
Aug 28, 2001 4:38 AM
The weight savings are going to be pretty minimal- the carbon tubes weigh almost nothing, most of the weight of a seatpost is in the clamp. You'll probably save about 1 gram/cm, so at most, you're looking at about 15g savings vs. the risk of doing some damage.

That being said, we cut carbon steerer tubes all the time with hack saws. To prevent fraying, wrap a layer of tape around the post and cut through the tape.
re: Use a Hacksaw on a Carbon Seatpost?Mike K
Aug 28, 2001 8:40 AM
Leave enough to let about 3" of post fit inside your frame. Like the previous post though it's probably hardly worth the effort/risk...