dirtdawg21892wrote a review of SRAM Guide R Disc Brake on May 8, 2015
Familiarity: I've used it several times
right out of the box, these things work well. after bedding them in they are unbelievable. very consistent and confidence inspiring when paired with a 180mm rotor. more than enough power to stop a fully suspended fatbike even on the steepest terrain.