Adapts Avid 74mm caliper to fit various forks/frames and rotors. Adapters do not include CPS mounting hardware, if needed use: AV-630222 or AV-6303. IS: 51mm international standard / PM: 74mm post-mount / QR: quick-release / TA: thru-axle. For Fox-40, use AV-630192 (160mm) bracket with 203mm rotor kit