Surly Ultra New Rear Hub - Threaded x 130mm Rim Brake Fixed/Free Silver 32HSurly Ultra New Rear Hub Threaded x 130mm Rim Brake Fixed Free Silver 32H. Surly Ultra New Rear Hubs Non Disc. Axle is quick release and bolt on compatible Stainless 6mm bolts are included; quick release skewer is NOT included 6061 T6 forged hub shell (same as the Surly New); 6901 bearings 4130 CroMoly axle and stainless cones; agressive knurling on cones and bolt caps for reduced slippage New axle cone system uses uses a specific shouldered axle that