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This is a single replacement fixing bolt for Shimano flat-mount road and gravel disc brake calipers. Flat-mount calipers need a specific bolt length for the frame, fork or adapter they sit on, and this C variant is one of those length options. It is a small, cheap part that matters: the wrong length or torque can strip frame threads or leave the caliper shifting under braking. Buyers are usually replacing a lost or damaged bolt or fitting a caliper to a new frame, not upgrading performance.
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Lowest price we've seen: $4.21 on Nov 12 at Backcountry.com. Tracked across 10 stores since Nov 12.
The Shimano Flat-Mount Disc Caliper Fixing Bolt secures Shimano flat-mount disc brake calipers to compatible frames, forks or flat-mount adapters. It holds the caliper in the correct position over the rotor within Shimano's flat-mount braking system.
Flat-mount systems use specific bolt lengths and configurations. The right bolt depends on the rotor size and on whether the caliper mounts to a frame, fork or adapter. The bolts are designed to give secure clamping force while keeping the caliper aligned over the rotor.
Correct installation torque is important for safe braking. Over-tightening can damage frame or fork threads. Under-tightening can let the caliper move and reduce braking efficiency.
