Mountain Bike Disc Brake Mounts

I show how to convert an old vintage mtb with no frame fork disc brake mounts to disc brakes using adapters.

Mountain bike disc brake mounts. The measurement of disc brake mounts is based on the distance in millimeters between the the center of the two bolt mounting holes. Most rear is mounts are setup for a 140mm disc so the mount for that would be 0mm is. Engineered with heat dissipating features on both the caliper and brake pads these brakes are designed to stay cool and keep performing even under extreme braking. The bolts are screwed directly down into the frame fork the bolts are parallel to the plane of the wheel.

There are two main types of disc brake mounts. Is mounts also frequently called is tabs disc tabs etc are unthreaded eyelets 51mm apart that bolts run through parallel with the hub axle. If your bike has a specific mount and you wish to install disc brakes with a different mounting system you can purchase a disc brake mount adaptor. I show various disc brake mounting adapters and how they can be used to install disc.

The beauty of this design is that the center of the rotor to the mounting surface of the brake posts is equidistant for the front and back meaning as long as both post. Unless you re lucky enough that everything s right there ready to accept a rotor or caliper converting a rim brake bike to disc is not a cheap proposition. By the time i was through i d bought a new front fork new wheels a conversion kit to mount the rear brake calipers and the set of 2 disc brakes. In almost all cases the brake caliper is then bolted to an adapter that has one set of threads for the is mounts and another 74mm apart for the caliper.