BMX - 990 Brake mounts + Caliper brakes?

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surewould
11-22-10, 01:16 PM
From reading the forums, I've figured out that 990 brake mounts = u-brake mounts.

Can someone tell me explicitly though if these caliper brakes (http://www.cxmagazine.com/avid-shorty-ultimate-cantilever-brakes-cyclocross-review) would be compatible with 990 mounts? Or is that whole distinct brake mount situation?

For the record, I am aware this makes little to no sense but I am getting experimental here.

wds178
11-22-10, 02:48 PM
First, those are not caliper brakes. Those are Cantilever brakes.
This is a caliper brake: http://www.danscomp.com/484009.php?cat=PARTS

Now to answer your question, no the brakes in your link will not work with 990 (U-Brake) mounts.
The pivot point on 990s (where the brake mounts to the frame) is above the rim. The pivot point on cantis & V-brakes are below the rim
-Bill
vredstein
12-10-10, 10:29 PM
First, those are not caliper brakes. Those are Cantilever brakes.
This is a caliper brake: http://www.danscomp.com/484009.php?cat=PARTS

Now to answer your question, no the brakes in your link will not work with 990 (U-Brake) mounts.
The pivot point on 990s (where the brake mounts to the frame) is above the rim. The pivot point on cantis & V-brakes are below the rim
-Bill

Is the different pivot point just to accommodate the different brake designs, or is there an advantage to having one or the other as far as braking performance? I noticed that some U-brakes posts are mounted on the seat stays, while some are mounted on the chain stays. Is there an advantage to either mounting location?

tyler11
12-12-10, 02:57 PM
Is the different pivot point just to accommodate the different brake designs, or is there an advantage to having one or the other as far as braking performance? I noticed that some U-brakes posts are mounted on the seat stays, while some are mounted on the chain stays. Is there an advantage to either mounting location?

that is a good question
mack_turtle
12-13-10, 11:37 AM
chainstay mounts under the chain stays means you can run any brake with a small drivetrain (such as 25/9, a very popular combo) and not worry about the chain rubbing on the brake. I have a frame with lowered chainstays (welded a little lower on the BB shell), low-profile Fly brake, and low-profile mounts, so I can run a 27/10 ratio without any problem. some say that chainstay brakes work better, but I think it has more to do with the dialed-ness of the brake setup you have.