Mixim 2 Pcs/lot 11T MTB Bike Road Bicycle Ceramic Bearing Pulley Rear Derailleur Jockey Wheels for Shimano & Sram XX, XO, X9, X7 Gold 11T Ceramic Bearing Jockey Wheel Rear Derailleur 11T Tooth Road MTB Jockey Wheels Gold color 4mm/5mm/6mm Axis Compatible for Shimano Sram XX X9 X7