KACTUS A-11 CNC Aluminum Rear Derailleur Pulley For SHIMANO SRAM 11T Red Looking for rear derailleur pulley replacement? Try our KACTUS A-11 AL7075 CNC Aluminum Rear Derailleur Pulley for SHIMANO SRAM 11T! It features smooth bearings and extra stiff pulleys for fast and precise shifting. With 11 teeth, it is compatible with Shimano and SRAM bikes of 7 / 8 / 9 / 10 speed. Crafted from AL7075 CNC aluminum, this rear derailleur pulley is tough and durable enough for long-lasting high performance. With such high quality and great design, it surely is your ideal choice.