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Is there an addaptor or mount that uses your V-brake mounts to allow a new fork without disc mounts that i have, to enable it to use caliper brakes, i try to avoid geting new brake levers, i figure an adaptor might be cheaper. Thanks.

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I've never checked -- what is the pivot-to-pad distance on a V-brake vs a canti? –  Daniel R Hicks Jan 10 at 13:03
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Doesn't seem clear to me what you are trying to do... Do you mean an adapter to allow a fork with v-brake mounts to use disc brakes, or do you mean switching from v-brakes to cantilever brakes, or are you talking about lever compatibility with different brakes? –  Gary.Ray Jan 10 at 13:22
    
I'm not sure what you're trying to do either. If you want to use V-brake levers with a caliper/canti brake, you can use a travel agent wired in reverse (so it halves the distance, but doubles the force rather than doubling the distance and halving the force, which the forward wiring lets you use caliper/canti levers with v-brakes/most mechanical discs). If you want a front disc brake, you should get a disc compatible fork (for the rear, you can do something like Brake Therapy). –  Batman Jan 10 at 14:53
    
If you want to mount a caliper brake on a bike designed for vbrakes/canti's, you'd probably have to rig your own shim up (and these have different cable pull than V-brake levers, but same as canti's), which probably costs more in time/materials than just getting a cheap v-brake or canti depending on what levers you have. I suspect finding a caliper which can clear the tire and has appropriate reach will be difficult given the typical fork which has V-brake/canti bosses. –  Batman Jan 10 at 14:59
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Then use vbrakes or canti's?sheldonbrown.com/calipers.html has some suggestions as to mounting calipers at your own risk, but if you don't have the mounts for it built in, use the type of brakes that you do have the mounting for. I don't really see why you'd want to use caliper brakes in particular if you have V-brake mounts, given V-brakes great performance, ease of setup, low price and tire clearance. –  Batman Jan 13 at 6:33

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Taking a shot in the dark here, but it sounds like you don't want to replace your short travel brake levers despite the fact that you have long travel brakes. I have seen caliper to canti adapters (there's a question about them somewhere on this site) but not canti to caliper adapters, though that doesn't mean they don't exist.

Your best and likely cheapest bet is to get a set of Travel Agent adapters. They adapt short pull levers (for road calipers) to long cable pull (for v-brakes). If you are using cantis, this adapter is not necessary.

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If you have just brake levers (i.e. not shifter+brake combos like STI), new brake levers may be cheaper than buying travel agents (however, if you have STI or combined shifter units, travel agents are probably the way to go). A set of Tektro RL520 (V-brake levers for a drop bar) runs about 25 dollars, which is less than one travel agent, while Tektro RL340 (short pull (i.e. canti/caliper) levers for drop bar) runs about 20 dollars. For a flat bar, Avid FR-5 levers (V-brake) are less than 20 dollars, and Tektro 275a (short pull) are less than 15 dollars. –  Batman Jan 15 at 3:06

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