ACB 6808 CC BO - 1-1/2 Black-Oxide treated Angular Contact Headset Bearing (40x52x6.5-36/45) 428420 XT and GRX 1x Mechanical

XT and GRX 1x Mechanical Derailleurs (5mm bolt hole)

BKC-0732 - T47-Threaded

as bottom bracket bearing for some older square taper BBs

Machined and ground entirely from 440C stainless steel

ACB 6808 CC BO - 1-1/2 Black-Oxide treated Angular Contact Headset Bearing (40x52x6.5-36/45) 428420 XT and GRX 1x MechanicalACB 6808 CC 1 1 2 Angular Contact Black Oxide treated Headset bearing (40mm x 52mm x 6. 5mm; 36 x 45deg) Angular contact headset bearing featuring anti corrosion Black Oxide Magnetite treated 52100 High Carbon Chromium alloy races paired with grade 10 Balls. Black Oxide treatment provides an extra level of corrosion resistance and extended worry free performance. This size bearing is also known in the bike Industry by these part numbers: HD 1404K