CeramicSpeed Ceramic Pulleywheel Red Shimano 11-speed

CeramicSpeed Ceramic Pulleywheel Red.
CeramicSpeed makes some of the most precise and lightest rolling bearings on the market.
They are all ceramic, and ceramic bearings gives also a better exploitation of the watt,
​​​​​​​For Shimano 11 speed rear derailleurs.
Made in aluminium and with ceramic bearings.
607 bearings.