If you're building up a flat-mount fork and need to run a 160mm rotor instead of 140mm, this is the bracket that makes it happen. The SRAM Flat Mount Disc Brake Adapter is the front-specific piece that bolts between a flat-mount fork and a flat-mount caliper, shifting the caliper outboard to clear the larger rotor. Without it, a flat-mount fork sits at 140mm by default — the adapter is what gives you the option to size up.

The design is a two-position bracket. Orient it one way and the caliper stays close to the fork for a 140mm rotor. Flip the orientation and the offset moves the caliper outboard to clear a 160mm rotor. That's the entire mechanism, and it's why SRAM lists this single part number as covering both rotor sizes on the front. Rear applications use a different part (00.5318.018.001) that only supports 160mm, so make sure you're grabbing the front version if that's what your build calls for.

Stainless caliper mounting bolts are included in the package, which is the hardware you need to attach the caliper to the adapter itself. The bolts that secure the adapter to the fork are typically supplied with the fork or the caliper depending on the manufacturer, so check what came with your components before you start the install. Torque specs follow SRAM's standard flat-mount recommendations, and it's worth using a torque wrench here — flat-mount hardware doesn't leave much margin for over-tightening into an aluminum or carbon fork.... Read More