Welcome to the world of enhanced cycling performance with the MUQZI Bike Rear Derailleur Pulley Roller Idler Bearing Jockey Wheel Set. Crafted from premium aluminum alloy using an upgraded CNC process, these jockey wheels are not only lightweight but also durable, resistant to corrosion and rust.

Enhance your riding experience with the ceramic bearing pulleys that reduce resistance, ensuring fast and sensitive operation. The set includes 2PCS Bicycle Rear Derailleur Pulleys, 2PCS Bike Rear Derailleur Bolts, 2PCS 4mm Adapters, and 2PCS 5mm Adapters, allowing for conversion into 4/5mm bearings post-installation.

Designed for compatibility, these jockey wheels are suitable for a wide range of bikes, offering a versatile solution for your cycling needs. Choose the appropriate size matching your original pulleys for optimal performance. Remember, when in doubt, opt for the smaller size to maintain efficiency.