Mountain Bike Ceramic Rear Guide Wheel 11T 13T Gear Transmission Aluminum Alloy High Hardness Bearing Tension Wheel Ceramic Pulley Rear Derailleur

Features:
Compatible with most rear derailleur on the market, supporting 11T / 13T, 4 / 5 / 6mm shaft guide wheel screw.
Guide wheel selection: please try to select the same as the origin-al guide wheel, and if not, you can choose a smaller one than the origin-al one.
Suitable for most cycling applications, whether it is road, MTB, or triathlon, these pulley wheel will optimize your speed rear derailleur with reduced friction and extended lifetime.
Lightweight design, these lightweight pulley wheel are fitted with ceramic bearings, which reduce friction and feature increased lifetime.
The aluminum alloy is very practical, and together with the pulley design, the set optimizes the overall performance of your derailleur.
It is easy to install and can be used as a nice repairs or replacement part of the bicycle to increase the service life of the bicycle.