Post mount forks and frames don't speak flat mount's language. The SRAM Flat Mount Disc Brake Adapter bridges that gap, letting you run modern flat mount calipers on older post mount interfaces designed for 160mm rotors. It's the kind of part you need when upgrading a brake system on a frame that predates the flat mount standard, or when swapping components between bikes with different mounting conventions.

The adapter bolts directly to post mount tabs spaced for 160mm rotors, then provides the flat mount interface on the caliper side. Steel construction handles the braking forces without flex or fatigue concerns. Two mounting bolts secure the adapter to the frame or fork, and the caliper attaches to the adapter using standard flat mount hardware. If you're running a different rotor size, you'll need a different adapter—this one works exclusively with the 160mm post mount configuration.

One detail worth noting: flat mount was designed primarily for road and gravel applications, so you'll most commonly encounter this scenario when fitting road-style brakes to cyclocross frames, older gravel bikes, or when repurposing components across your stable. The adapter maintains proper caliper alignment and pad-to-rotor spacing when installed correctly, though you'll still want to check rotor clearance and potentially realign the caliper after installation.... Read More