BKCJ-0351 - 11 tooth/13 tooth, XD15 Ceramic Hybrid Bearing, Machined Delrin Derailleur Pulleys for 11 speed Shimano GRX Derailleurs (5mm bolt hole) - Black and run quieter than stock

and run quieter than stock wipers

unlike other bearings

ACB 4545 405495 SS 1-1/2 440C stainless steel Angular Contact Headset bearing (40

combined with deep race grooves in these bearings for greater lateral support for the twisting and multi-directional forces associated with mountain bike pivots

while never leaking a drop of oil

BKCJ-0351 - 11 tooth/13 tooth, XD15 Ceramic Hybrid Bearing, Machined Delrin Derailleur Pulleys for 11 speed Shimano GRX Derailleurs (5mm bolt hole) - Black and run quieter than stockBKCJ 0351 11 13 tooth, XD15 Ceramic Hybrid Bearing, Machined Delrin Derailleur Pulleys for 11 speed Shimano GRX Derailleurs (5mm bolt hole) The ultimate upgrade pulley. Guaranteed to last forever against corrosion Precision machined Delrin Derailleur pulleys featuring XD15 Ceramic Hybrid radial bearings for enhanced shifting performance and longevity. Designed and manufactured for performance, these pulleys feature CN (tight clearance) bearings in the