Mountain Bicycles Pulley Wheel - 12T 11-speed rear derailleur repair kit - Easy to install pulley wheel that improves shifting performance. This part is designed to enhance the function of your bike by delivering smoother, more reliable shifts with minimal setup. - 12T size for 11-speed rear derailleur systems. The kit is designed for excellent compatibility with 11-speed drivetrains in Mountain Bicycles setups, helping maintain correct chain alignment and derailleur operation. - Improves handling on various terrains. Suitable for use on mountain paths and city roads, providing the necessary support for efficient bike handling and consistent performance when changing gears. - Target users. Ideal for cycling enthusiasts and professional riders who require precision and reliability when shifting, with a focus on dependable drivetrain performance. Use scenarios - Replacement and maintenance on an 11-speed drivetrain. Replacing worn or slipping pulleys to restore smooth shifting on mountain trails or urban routes. - Uphill performance on mixed terrain. Use during climbs on mountain paths or long city hills to maintain consistent gear changes and chain tension. - Daily commuting and road riding. Upgrade for reliable shifting during regular rides and training sessions, ensuring predictable performance across all gears.