Aluminum alloy guide gear set with 12T, using ceramic bearings - MEROCA

Aluminum alloy guide gear set with 12T, using ceramic bearings - MEROCA
colors : red,black , yellow ,blue , purple 
options : 12T

Material: Aluminum alloy + ceramic bearing

Weight: 12T: 12.8g 

Application: Mountain bikes, road bikes

Applicable: 8/9/10/11 speed

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