steer tube cutter
09-05-10, 08:18 PM
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steer tube cutter
any one still make the tool for sizing a steer tube down from 27mm to 26.4? I could not find one, but maybe I am using the wrong search terms. I have a Var facing tool for the steer tube race, so if a cutter that fit that tool were available...
09-05-10, 08:56 PM
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That's alot of material to be removed. I don't think such a tool exists and if it did I'm not sure how safe the results would be.
09-05-10, 09:01 PM
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.6 of a mm is not a lot of material to remove from just the area where the crown race presses on. I am pretty sure my LBS has one, but I would like to have my own if it is ~100.00 mark
09-06-10, 06:44 AM
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Yes, they are certainly made. My LBS has one and years ago milled the crown race seat of my '85 Bridgestone 400 from JIS to ISO diameter. Here is a source for various models:
https://www.biketoolsetc.com/index.cg...ce-Cutter-Sets
These things are quite expensive so unless you are doing a lot of older JIS bikes, it's probably not worth owning one.
https://www.biketoolsetc.com/index.cg...ce-Cutter-Sets
These things are quite expensive so unless you are doing a lot of older JIS bikes, it's probably not worth owning one.
09-06-10, 07:14 AM
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That would be about 0.01" of material.
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09-06-10, 09:07 AM
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Bike Tools Etc. offers several models but they're not cheap: https://www.biketoolsetc.com/index.cg...ce-Cutter-Sets
If this is a one-off project, you may be better served by having your local LBS do the work.
09-06-10, 09:08 AM
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Crown race mills certainly exist, and this is a bread and butter job. It used to be that every decent shop had this mill since it was required to prep 95% of frames. Now they aren't so common any more, partly due to the change in the most popular steerer to 1-1/8", and also to changes in how forks are made.
The tools are still made, but I doubt you'll find one within your limited budget, as they're typically $250-300 or more new. Possibly you'll find a used one (look for a shop going out of business) but it'll be hard to gauge it's condition. If the cutter is OK but dull, figure $25-35 to sharpen.
The tools are still made, but I doubt you'll find one within your limited budget, as they're typically $250-300 or more new. Possibly you'll find a used one (look for a shop going out of business) but it'll be hard to gauge it's condition. If the cutter is OK but dull, figure $25-35 to sharpen.
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09-06-10, 10:26 AM
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From the links you provided I may already have it, the tool I have I was under the impression was for facing the top of the crown, I will take some measurements.
09-06-10, 10:32 AM
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Think of it as the opposite of a drill. Rather than go through a donut to make a hole, a crown mill (holo-mill) removes the donut and leaves the "hole".
When you drill all the cutting is done at the bottom, and the diameter of the resulting hole is constant regardless of depth. A holo-mill works the exact same (but opposite) way, all the cutting is at the forward edge, and as it advances it leaves a pin of uniform diameter regardless of length.
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Last edited by FBinNY; 09-06-10 at 10:47 AM.
09-06-10, 10:38 AM
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Awesome. I bought a large box of professional shop tools a couple years ago and am constantly finding new stuff, and what some of it is for 
09-06-10, 10:53 AM
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I believe the tools intended job is to simply face and square the crown race but it is used to cut it down. I think this may be a pricey tool though.
here is some info on the VAR tools for this https://www.sheldonbrown.com/var/pages/var0024.html
here is some info on the VAR tools for this https://www.sheldonbrown.com/var/pages/var0024.html
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09-06-10, 02:32 PM
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I thought you were trying to reduce the diameter of your entire steerer, not just the race.
09-06-10, 04:30 PM
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09-06-10, 04:51 PM
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Mine is double sided, 27mm on one side 26.4mm on the other. Came out very nice, thanks again.
