Avid bb7 mechanical disc brakethe mechanical advantage is yours with gobs of beautifully modulated power and intuitive easy to use adjustability the bb7s set the standard in the realm of mechanical disc brakes inboard and outboard adjustor knobs tri align caliper positioning system and integrated cable stop spring tension adjustment ensures that avids standard is everyone elses goal features weight329 grams 160mm rotor front post mount caliperdesign mechanical forged 2 piece alumin