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Canti Bosses Prep

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Canti Bosses Prep

Old 12-01-21, 08:29 PM
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Andrew R Stewart 
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Canti Bosses Prep

Since sort of retiring I've done a bunch of frame work but nothing ready for the public but for this point in time while making the second unicrown fork I've done. With about 85mm between the insides of the Columbus blades and a goal of about 82mm between the canti posts the contact area they share is small. So I sleeved the canti base to increase the OD and added a cap to what will be the big open "mouth" under the sleeve. BTW I used my bench grinder to do most of the sleeve's mitering. Andy


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Old 12-01-21, 09:11 PM
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I like that idea of sleeving the canti boss. I'll make a note of that.
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Old 12-02-21, 02:14 AM
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Very nice! A common problem nowadays as people want such wide tyres and don't expect anyone to still be using rim brakes. Caps always look neater. I also cap the bottom of the steerer under the unicrown. Should probably drill a drainage hole but it's surely better than what normally happens which is that whole area gets filled with mud.
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Old 12-02-21, 09:26 AM
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Nicely done, Andy!
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Old 12-07-21, 10:36 PM
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Andrew R Stewart 
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Thought I'd follow up on this thread. Here's the backside of the fork with the bosses capping shown. You can see how far off blade the bosses are and why I sometimes increase the boss base diameter. Andy
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Old 12-09-21, 12:41 AM
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Another option is angling the stand-off tubes. Then you have a full miter and no gap to cap off.



Sorry about the dirty fork with a rattle-can paintjob. Fork made in '84 and modified (longer steerer) in the '90s, too cheap for a proper respray.
Also sorry if the angled standoffs idea is too obvious to bother mentioning.

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Old 12-09-21, 02:57 AM
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Not too obvious at all. Wish I'd thought of that when I made my first fork with canti bosses. I couldn't think of a solution and re-made the whole fork to be narrower!
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Old 12-09-21, 09:22 AM
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Andrew R Stewart 
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I did something like that a long time ago. But I had a short 1/2" tube coming off the blade at 90* and the base of the boss also at a 90* with the support tube. A "repair" on a MtB fork when they were rigid and the rims were skinny. I like your angled supporting tube, much nicer. Andy
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