A caliper needs a mount standard (flat mount, post mount, IS) and an actuation that matches the lever. Both are safety-critical: two independent sources on the bike side before "fits".
- How do I know whether a part in this category fits my bike?
- Every part page lists the standards it requires and its computed verdict on each bike in the fleet, with its confidence and sources. An "unknown" verdict means we do not have the measurement on file — not that it fits.