Stone Pulley Wheel Gear Guide Roller Jockey 10t 12t 14t 16t Bearing Road MTB Bike Rear Derailleur for GX XX1 for Shimano M9000

Ultegra R8000 Rear Derailleur: The r8000 rear derailleur and optimal performance for mountain bikes. Shimano Gear Shifter 3X7 Set: Compatible with the variable performance of gear varieties. Gear Box Motor Roda Tiga: The gear box motor can provide the maximum force, and it can reach the maximum weight of the entire wheel. Shimano Bicycle Gear Set: Compatible with xx m9000 v9000 single wheel pulley. Shimano Alfine Gear Hub: Light weight, strong and sturdy, suitable for mountain bikes. Name: Stone Pulley Wheel, narrow wide tooth. Material: POM high strength resin, NSK bearing. Bearing: Japan NSK 689. Tooth: 10T/12T/14/16T. Weight: 9g/10g/12g/15g. Thickness: 8mm. Inner diameter: 6mm compatible with 4/5mm). Color: black wheel with black cover, black wheel with red cover. Fit for: 9 1011 12 speed, for Shimano and Sram Derailleur(most). Package: 1 pulley wheel, 1bolt adapter for 4mm to 6mm, 1bolt adapter for 5mm to 6mm. Advice to customer want to modification: 1. If you are single chainrin