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Need Help in setting up Carbon Fiber Steerer Fork(6 posts)

Need Help in setting up Carbon Fiber Steerer ForkMTG^
Aug 27, 2001 10:49 PM
I need any input on installing and setting up a carbon steerer fork.I done a couple of installation with alloy steerer fork,but not with carbon.How to you cut a carbon steerer?would regular metal hacksaw do?Any tricks?Should the carbon steerer protrude above the top of stem?and by how many mm?Or should it be like the alloy steerer(below 2-4mm)?What's the max spacers you can use?How about torque in the stem bolts?And also in setting up the wedge expanding nut?Should you lightly grease the inside of the stem?Any help is appreciated.
A few tips...TJeanloz
Aug 28, 2001 4:49 AM
The longer carbon steerer tubes have been out, the more we learn about how to work with them. Most fork companies recommend some fancy diamond hacksaw, but a regular metal one will do the job pretty well. Wrap the area to be cut with electrical tape, and then cut throught the tape to prevent fraying. It saws like butter compared even to alloy. Most recent thought is that the steerer tube should protrude above the stem by about 2mm- which means that you will need to put a spacer on top of the stem. This prevents the stem clamp from 'collapsing' the top of the steerer tube- something that I have seen happen. Number of spacers varies by manufacturer and tube diameter (1" or 1 1/8"). Last time I looked, 20mm was safe for 1" and 30mm was ok for 1 1/8". Torque on the stem bolts should be the same as for an alloy steerer- but choose a stem carefully. The stem should not have an internal clamping mechanism, and should have a 'gap' that contacts the steerer tube at a 90 degree angle. Don't grease anything. Other than that- it's just like steel.
My LBS guy said to cut it on the bike -- set it up, subtract abill
Aug 28, 2001 8:22 AM
mm or two, and use a spacer or the stem as a guide. He also said to use a plain ol' hacksaw. Haven't done it yet; that's next.
That'll work...TJeanloz
Aug 28, 2001 9:28 AM
That's traditionally how threadless steerers are cut, and I've done dozens this way with out any problem. But every so often, especially with cheaper forks, the stem will crush the top end of the (carbon) steerer tube and create a failure that works its way down. I've always felt better safe than sorry, and have begun leaving a little bit of steerer above the stem and adding a spacer on top to give the stem a better surface to clamp to.
Ditto..... on the lengh... good adviceJohnG
Aug 28, 2001 8:55 PM
Fine blade on a sawsall works great for cutting the steerer tube.
JohnG
re: Need Help in setting up Carbon Fiber Steerer Forkgrassy knoll
Aug 28, 2001 3:09 PM
the saw to use is a "carbon grit blade" which fits on a regular hacksaw and costs $2.00 at Sears. kind of looks like a regular hacksaw blade with black sand where the teeth should be. I was in your same situation and did a small test cut with a regular hacksaw. hard to cut and lots of fraying. the carbon grit blade cuts like butter and didn't require any sanding. could not find these blades at the local megastores so try Sears first. don't grease the inside of the steerer tube. thanks to cliff oates who clued me into this blade. remember: measure twice and cut once :)