12t Durable Easy To Install Premium Upgraded Design Reliable Top Choice Sram X01 Xx1 Eagle X-sync Bike Gear 12-speed Plastic 14t Description: Specifications: Type: 11 Gear Guide Pulley Color: Black, White, Blue, Red, Yellow, Purple Material: Aluminium Size: 5mm (D) Net Weight: 9.8g Inner diameter:about 5.2mm Package Includes: 1 x Wheel Rear Derailleur Pulley (11T) Specifications: Features: Brand new and high quality Bike Cycling Aluminium Jockey Wheel Rear Derailleur Pulley 11T Teeth: 11T Bearings: Upgraded RS bearing. Design for outdoor Bike Product name: rear derailleur 11T guide wheel Size: inner diameter 8.8 MM outer diameter 43.4 MM thickness about 0.6cm Screw hole of rear derailleur: 8.9MM Gland hole size: 0.5cm Material: aluminum alloy gear plate, the rotating shaft is bearing Weight: 9g Size: 11 teeth Suitable for bearing material: CNC super light As long as the rear dials suitable for are 11T13T, most of them are compatible Package Included: 1 x Wheel Rear Derailleur Pulley (11T)