RollerBoys (jockey Wheels) equipped with low friction ceramic bearings for ultra-smooth glide and exceptional durability.
 
Top Features:
 
 
Lubricated with special ceramic light oil for extra smoothness
 
 
Composite material provided by EMS Swiss, with 40% glass-fibre
 
 
Complete set of bushings for different shifting systems included
 
 
Ceramic bearings
 
 
11T. Compatible with Shimano 9, 10 and 11-speed / Mega Range and Campagnolo 11 speed.