Diamondback Bicycles El OSO Complete Fat Bike 6061-T6 aluminum frame with hydroformed tubes, 1.5" tapered/machined headtube, fits up to 26x5" tire Rockshox Bluto 120mm Solo Air fork, 32mm stanchion, w/rebound and lockout adjust Shimano M447 hydraulic disc brakes (180/180mm rotor)