Diamondback Bicycles El OSO Gordo Complete Fat Bike El Oso Butted Heat Treat Steel 1-1/8"Headtube, 150mm Rear, Fits up to 26x5" tire DB El Oso Custom Rigid Steel Fork, 1-1/8", 135mm QR Dropouts Shimano Tourney RS-35 Grip Shift 7 Speed Shimano 7 Speed (14-28T) Apex Mechanical Disc, 160mm/160mm rotor