Disc brakes: fitting International Standard callipers to your bike

International Standard, or IS callipers are bolted to the bike using bolts which pass through the mounts on the frame or fork and then screw into the calliper, which is threaded. The horizontal alignment is adjusted with shims (thin washers) between the frame and the calliper.

The instructions that follow are to fit IS callipers to an IS mount fork, but if you’re fitting them to a frame then just substitute the word ’frame’ for ’fork’. It’s wise to make sure that your fork has been correctly faced before fitting an IS mount calliper. Facing involves shaving off the inner face of the mounts (A) to make sure that they are exactly parallel. It’s a job that requires a specific and very expensive cutting tool, so is one for the bike shop only, but it is worth doing as even a brand new fork may not be straight. ’Shim’ is a fancy name for an accurately sized washer. Shims have to be of a precise thickness because the spacing between the calliper and the frame must…

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