Sram MTB 12T Ceramitech Pulley Set (set of 2)Info Product Intro Vid Maintenance Vid Sram's brilliant 11spd systems for mountain bike and 1X road cyclocross groups are rugged and dependable, but the stock pulleys are utter rubbish. Don't take your word for it, check for yourself. We know what you'll find: Draaaaaaaaaaaaaaaag. Lots and lots of wattage sapping, slow you down drag. You will feel the difference made by our BBInfinite Ceramitech pulleys. from the first pedal stroke. Each 12T Sram MTB