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Canti post appears to be too thick

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Canti post appears to be too thick

Old 08-12-08, 08:41 PM
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genericbikedude
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Canti post appears to be too thick

I just got a new off the peg Bob Jackson world tour, and I can barely force a canti brake onto the left canti post on the fork. Once I get it on, it doesn't turn very easily at all -- clearly unworkable.

My question is whether this is common, and what a shop or framebuilder might be able to do about this, or whether this is something that I should just take some sandpaper to.

The problem is not the brake, I tried a few old crap cantis that I have lying around, and nothing would fit (or at least not easily).

So, take it to a framebuilder? Johnny Coast and Brooklyn Machine Works are nearby. Would a reputable shop be able to handle this? Or should I try to sand it down? Any tips on this? What kind of sandpaper, what pitfalls to avoid, etc?

Thanks for tips!
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Old 08-12-08, 08:42 PM
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just to add -- all three other cantis seem to fit fine.
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Old 08-12-08, 08:56 PM
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If the canti posts are replaceable, replace it. Unless the machine shop is willing to do you a favor, it'll cost you much more to have them turn it down to size (assuming that's the problem) than to just replace it with a new one.

Do you have a set of calipers or a micrometer to measure the post and figure out where the post is too big? It could also just be bent. I personally would not bother with sanding the post unless it was not replaceable, but if you went that route, knowing where the post was out of spec and only sanding/filing at that area would be your best bet.
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Old 08-12-08, 08:58 PM
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That's happened to me before -- a brake post/boss/mount going bad.

I think it happens when a bolt that doesn't match up well with the post is forced on, which causes the post to bulge outward. Sometimes only the very tip will "mushroom," and you can file it down, but you might have to replace the post (if it's replaceable.)
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Old 08-12-08, 09:06 PM
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mmph. its not replaceable. I guess the thing to do would be to take it to a shop with a super-accurate caliper. annoying!

thanks a lot bob jackson!
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