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Cutting Steerer Tube

Old 02-28-14, 09:29 PM
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OldsCOOL
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Cutting Steerer Tube

I have a fork from a taller frame that I want to fit into this shorter frame. Being my first attempt I'm needing help from the guys that have done this.

Here is what I have: I purchased a classic Cannondale frame with a Litage FX aluminum fork that has been fitted with a 3/8" spacer in a stack configuration. The spacer/bushing sits atop the keyed washer and below the top locknut of the headset. It would all work fine and dandy but I would like the fork to fit the frame doing away with the tall looking spacer in the headset. It is my estimation that there are just enough threads to cut the tube 3/8" to forgoe the spacer and not need the sxtra threads cut.

I'm handy with tools and do my own wrenching in my garage. Is this something I should attempt with a little coaching?
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Old 03-01-14, 06:36 AM
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It's been a really long time since I've done anything with a threaded steerer, but with careful measuring I don't see why you shouldn't do this. I would get a steerer cutting guide.
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Old 03-01-14, 08:03 AM
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You can use two hose clamps as a cutting guide. Or two wraps of masking tape. Cut about 1mm long and file/grind down to length. Spin on, all the way down, the threaded race first. After cutting and filing the end the unthreading of the race will help clean out the last/cut thread. But as Eric said, measure and mark carefully. Andy.
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Old 03-01-14, 08:11 AM
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Thanx guys, appreciate any help you can give. I'll go slow and make a short cut on it just to see if I can do it. We have a vintage frame builder in town if that practice cut wont clean up for me.
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Old 03-01-14, 11:48 AM
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Originally Posted by Andrew R Stewart View Post
You can use two hose clamps as a cutting guide. Or two wraps of masking tape.
Better yet, two headset cups. Thread them down to where you need to cut, leaving just enough gap for the saw blade. Once cut, unthreading the lower cup will chase the threads for you as well.
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Old 03-01-14, 12:09 PM
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Originally Posted by JohnDThompson View Post
Better yet, two headset cups. Thread them down to where you need to cut, leaving just enough gap for the saw blade. Once cut, unthreading the lower cup will chase the threads for you as well.
Now, that's a good idea!
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Old 03-01-14, 03:49 PM
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Originally Posted by JohnDThompson View Post
Better yet, two headset cups. Thread them down to where you need to cut, leaving just enough gap for the saw blade. Once cut, unthreading the lower cup will chase the threads for you as well.
That was my plan, too. I have a spare or two laying around. This technique does work (though not trying it on fine-threaded pipe).
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Old 04-10-14, 07:51 PM
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Not to bump a thread but just wanted to say thank you for the tips and confidence to cut the tube. With a fresh saw blade in the saw and fork in the vise I completed the cut. No probs, reinstall went well. Whew.
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Old 04-10-14, 08:53 PM
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thanks for posting an update
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