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It was originally spec'd by Trek on Madone and Domane bikes
6702 2RS - ABEC-3 Radial Bearing (C3 clearance) - 15mm x 21mm x 4mm -
they deliver perfect alignment and long-term stability
RD RX-820 and RD RX-825
HDK-0010 - 1-1/8 x 1-1/2 stainless steel
BKCJ-0300 - 11 tooth, XD15 Ceramic Hybrid Bearing, Machined Delrin Derailleur Pulleys for 11 speed Shimano Derailleurs (5mm bolt hole) - White 428420 It was originally spec'd byBKCJ 0300 11 tooth, XD15 Ceramic Hybrid Bearing, Machined Delrin Derailleur Pulleys for 11 speed Shimano Derailleurs (5mm bolt hole) The ultimate upgrade pulley. Guaranteed to last forever against corrosion Precision machined White 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
