MEIJUN 2X 18T MTB Bicycle Rear Derailleur Jockey Wheel Ceramic Bearing Pulley Road Bike Guide Roller Idler 4mm 5mm 6mm(Red)
- All the results of the simulations and the experimentations indicated that the ceramic ball bearings' performances are very good, especially in the low load and high-speed environment.
- Size:18T
- Structure: Ceramic bearing
- Fit for 4/5/6 MM roller screw axis