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Canti bosses too long?

Old 04-25-12, 04:31 AM
  #1  
martyn3200
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Canti bosses too long?

I've bought some replacement cantis (Tektro CR50) for my Kona Jake the Snake 2004 frame. When installed the spacer on the brake itself, it is just shorter than the canti boss it goes over. This means when I install the canti bolt it hits the boss before the brake spacer and means there is play in the brake. Can you get mini spacers to fit over brake bosses?
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Old 04-25-12, 10:19 AM
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I don't know how much room you need, but you can get or improvise spacers if necessary. They should probably go behind the brake so there's no movement against them, unless they're brass or bronze. The canti boss length is supposed to be standard, but there is a tolerance and some variation.

Also, if your boss is of the two part type where it screws into a fitting on the fork, it's possible that it isn't tightened all the way, and that might account for the excess length.
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Old 04-25-12, 10:20 AM
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maybe a shim spacer..^^^ or just file down the end of the frame boss
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Old 04-25-12, 10:23 AM
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Originally Posted by fietsbob View Post
maybe a shim spacer.. or just file down the end of the frame boss
Yes, filing the boss is an option, but you may later mount a different brake and find it too short, which is harder to manage. If the boss is the replaceable type, then filing it may be the best and easiest solution, but be sure to keep the end square, which can be managed by stacking a bunch of washers on it as a gauge. Otherwise, if the boss is of the non-replaceable type, I'd leave it alone and use shims.
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Old 04-26-12, 06:19 AM
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Originally Posted by FBinNY View Post
... but you may later mount a different brake and find it too short ...
You can always cut something shorter, but you can never swear it longer. I found this out with a fork steerer.
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