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Cutting carbon steerer tubes(5 posts)

Cutting carbon steerer tubesspeedchump
May 30, 2001 9:20 AM
What's the best way to cut a carbon steerer tube? Will a tubing cutter work?

Thanks in advance.
re: Cutting carbon steerer tubespeloton
May 30, 2001 9:41 AM
Don't use a pipe cutter. It will put stress on the steerer that can cause failure. Try a hacksaw for cutting carbon steerer. Check with your manufacturer for specifics if you aren't sure. This is one part that you don't want to mess up. I have also seen that it is a good idea to leave a headset spacer above the stem on a carbon steerer. This prevents the stem from pinching the top of the steerer when tightened, and causing a failure. The headset spacer covers a little extra steerer that extends above the stem. Provides a little extra stregth.

I would advise you to check with your local shop to make sure that you are going about everything properly.
re: Cutting carbon steerer tubesWilly D.
May 30, 2001 2:25 PM
I have found the axe to be the best tool for this job. However, my friend swears by the hack-saw. A large kitchen knife will do in a pinch.
Good luck.
no tubing cutter....C-40
May 30, 2001 4:00 PM
Use a new hacksaw blade with either 24 or 32 teeth per inch.

As already mentioned, you may want to cut the tube to protrude 1 to 2mm above the stem, and place a 3mm spacer on top the stem. Some pro mechanics believe that this reduces the chance of the stem clamping forces cracking the steering tube.
mr. "c-40" is correct. (& use less spacers )racer x
May 30, 2001 8:42 PM
he's right.

i'd also suggest putting masking or duct tape over the area you'll cut--this helps prevent the carbon fibres in the steerer tube from fraying as the blade first meets them.

many manufacturers also recommend that you don't run much more than 2cm of headset spacers--it may give your bar/stem enough leverage to flex the tube more than it is designed.