Got a friend who has a bike with 6" disk brakes and want's to change the rotor to 8". Is it possible to change the rotor while keeping the rest of the brake intact? Or does he need to get a whole new disk brake set for a bigger rotor? I'm assuming he needs to get a new 8" brake set but I dont own any disk brake bikes at the moment so i wouldn't have a clue!
Thanks for help.