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Carbon Steerer Tube(20 posts)

Carbon Steerer TubeRlieto
Dec 22, 2003 4:23 PM
What is the best method to cut a carbon steerer tube.
Measure 6 times, cut w/fine blade hack saw (nm)Kerry Irons
Dec 22, 2003 5:14 PM
Kerry's right. Measure 6 times then measure again, cut nmDave Hickey
Dec 22, 2003 5:40 PM
wouldn't that be seven time? nmQubeley
Dec 22, 2003 7:16 PM
I dunno. me not done good in math:-) nmDave Hickey
Dec 23, 2003 6:04 AM
no, no; don't measure -- mark instead (or both) nmDougSloan
Dec 23, 2003 12:59 PM
Listen to Doug.. he knows. What did you do with that fork?Dave Hickey
Dec 23, 2003 2:02 PM
still in the box in my garage nmDougSloan
Dec 23, 2003 4:28 PM
Don't listen to those guys12x23
Dec 22, 2003 7:07 PM
Let me tell you what I did a couple of months ago. I decided to cut my HSC-2 a bit to remove spacers (worried about what the spacer police were thinking, I reckon). Well, after measuring several times and marking the steerer, I pulled the hacksaw across the steerer just as I realized I'd forgotten to allow for .... THE STEM !! Duh !!

So, measure six times, put everything down and go for a long ride, then measure six more times (with stem and spacers in mind), and cut with fine-tooth hacksaw blade.

And, if you cut it too short please post here so I'll feel better.
hey, do you still have that fork?Qubeley
Dec 22, 2003 7:22 PM
How much steerer is left? I am looking for a HSC2(that's the straight blade, right?). I ride size 50 with no spacer, might work.
hey, do you still have that fork?12x23
Dec 23, 2003 8:40 AM
Yeah, I'll measure it tonight and let you know. It was cut for a 175mm headtube with Chris King headset and 1cm of spacers, so I bet it'll work.

I'd about decided it would spend the rest of its life as a 350 gram truing stand. ;-)
Straight blade12x23
Dec 23, 2003 10:16 AM
It is 215mm from fork crown to "blemish." The cut is approximately 1mm deep. I replaced the fork rather than take a risk even thought this blemish would have been in the middle of the stem clamp.
Straight bladeQubeley
Dec 23, 2003 1:25 PM
Please email me at ruoc47atyaoodotcom: Is it 1 inch? Your RBR special wink wink price. Photo would be nice.
Thanks a lot!
Straight blade12x23
Dec 23, 2003 2:00 PM
Its a 1" steerer. I'm at work, have to do the trainer (its in my office so I can't leave without riding it)before I leave, so I'll get back to you tonight.
don't measure at all...C-40
Dec 23, 2003 6:22 AM
Assemble the bike as you intend to ride it with the appropriate spacers under the stem. Scribe a line at the top of the stem and either cut 2-3mm below this line or 2-3mm above the line if you prefer to use a 5mm spacer on top of the stem at final assembly.

Use a new 24T hacksaw blade and cut around the tube, following the scribed line. Cutting through the tube from top to bottom is more likely to result in a crooked cut.
As usual, C-40's nailed it!Nessism
Dec 23, 2003 7:24 AM
I do it just as C-40 described: assemble first and draw a line. Next, cut slightly below the line. I use a cut-off wheel mounted to my 6" grinder. BTW, the cut off wheel is very handy for cutting cable casing also! To clean up the cut, I use the grinding wheel on the other side. Carbon steerers can be ground just like a piece of wood. In fact, before I bought the cut-off wheel I used to use the corner of the grinding wheel to cut the steerer. Just rotate the steerer and grind away. Very easy.

Extreme Caution Re: Grinding wheel & carbon dustCarbonTi
Dec 23, 2003 9:33 AM
Hey Nessism and Others,

Use a grinding wheel to cut a carbon steerer only in a well ventilated area while wearing some breathing protection for the carbon dust. The dust is unbelievably fine and stays airborne for a while. Use caution.
Dec 23, 2003 8:15 AM
When you LIGHTLY sand down the edge a little with very fine sandpaper, go upward (direction: crown ->top of steerer) only. This will prevent those small splits in the CF.
From Park Tool website...fracisco
Dec 23, 2003 7:32 AM
Detailed instruction, and a recommendation for a saw guide.

This is something that I would have my shop do, as I would not want to have a Sloan incident.
Dec 24, 2003 4:02 AM
Here is one way of doing it that is simple, cheap and works very well.

Steps 1.

Take a 2"X6" piece of woood. Drill a 1 1/8" hole through the wood. This will be used later.

Step 2.

Assemble the fork, spacers and stem to the desired height on the bike. Measure from the top of the carbon steerer to the top of the stem or the top of the last spacer if a spacer is used on top of the stem. Also, mark the top with a white marker. It is best to use a metric tape to avoid fractions.

Step 3.

Disassemble the fork from the frame.

Step 4.

Measure from the top of the steerer tube, based upon your measurement in step 2. It should be alligned to your mark. If not, something is wrong and measure again.

Step 5

Take some tape (masking or electrical) and tape around the steerer tube. The top of the tape is the line that you will be cutting. The tape should be 3mm below the line marked. Use only one wrap of tape. Measure again and make sure that the top of the tape is the measurement taken in step 2 plus 3 mm.

Step 6.

Install the steerer through the hole in the wood. Support the fork in a way that keeps the steerer tube parallel to your workspace that will be used for cutting.

Step 7.

Using the wood as your guide, cut the steerer with a new 32TPI hack saw blade. Use the side of the 2x6 as your guide. The blade will 'ride' the side of the wood down to a perfect and straight cut. The blade should just nick the tape while it is cutting.

Step 8.

Remove the tape. If there are any burs, use some emery paper to take them off.

Step 9.


Perfect cuts every time. Total time, about 45 minutes.