dischi freno jagwire pro con magneteIntegrated magnet for use with E Bike speed sensors; Two piece design with aluminum spider and separate stainless steel braking surface; The 6 bolt disc includes T25 mounting bolts, Centerlock version also available; Not compatible with caliper brakes that use pads extending beyond the brake body, such as Avid BB7, Avid Juicy, Hayes HFX, and Hayes MX1;