Aluminum alloy guide gear set with 11/13 teeth, using ceramic bearings - MEROCA

Aluminum alloy guide gear set with 11/13 teeth, using ceramic bearings - MEROCA
colors : red,black , yellow 
options : 11T / 13T  

Material: Aluminum alloy + ceramic bearing

Weight: 11T / 13T

Application: Mountain bikes, road bikes

Free-falling sleeve, greater compatibility, initially 6MM, can be converted to 4/5MM bearing, flexible rotation, rear derailleur guide wheel with male and female teeth, ceramic bearing, lightweight aluminum alloy, smooth speed change