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will cutting a carbon seatpost down impact integrity?(6 posts)

will cutting a carbon seatpost down impact integrity?funknuggets
Jan 17, 2003 7:34 AM
Want to cut carbon post down to 220 to fit short alu frame seattube depth. Will this affect the integrity of the carbon seatpost?

Secondly... potentially stupid question, but will there be noticable road vibration dampening between ti seatpost and carbon? Or will it be pretty negligible difference and not worth the effort?

Thanks in advance,

Chris
re: will cutting a carbon seatpost down impact integrity?Spunout
Jan 17, 2003 7:36 AM
1) I wouldn't do this. You mean, you have a frame with a <220mm seat tube? Do you realize how much weight you are planning to save? (10g).

2) It is said that carbon will absorb more than Ti. I dunno, I ride a steel frame and don't have that problem.
re: will cutting a carbon seatpost down impact integrity?funknuggets
Jan 17, 2003 7:42 AM
nah, the seatpost is made for off road and is way long. My seat tube on the Fondriest is butted at the top to increase strength and requires that the depth of the seatpost into the frame be no longer than 220mm, as the thickness of the frame increases below that point. SO... fact of the matter is that the post is way long and would stick out way too far when it is inserted all the way down. It is not a matter of weight.

Chris
re: will cutting a carbon seatpost down impact integrity?Spunout
Jan 17, 2003 12:02 PM
Okay. I was just wondering if there are integrity issues of the fibres, like for filament wound golf clubs or whatever. There are special cutting tools (abrasive band) for this job.
won't hurt...C-40
Jan 17, 2003 7:46 AM
Reducing the length should not be a problem.

A carbon post won't improve the ride.
masking tape - cut with sawcroll-duraace
Jan 22, 2003 9:52 PM
You certainly can trim a carbon post to length...first mark the spot you want to cut, second wrap a small piece of masking tape around the post, third draw a straight line to gauge your saw blade, fourth (if you have a steerer tube fork cutting guide use this) make sure your using a newer saw blade....fifth, CUT !!!! removing 20 dollars worth of carbon.

If you still have 6 or more inches of post exposed, i believe carbon certainly has better ride characteristics over an aluminum post. you'll be the judge