ACB 4545 150 BO - 1-1/2 Black-Oxide treated Angular Contact Headset Bearing (40x52x7 -45/45) TH-873 The eleven-tooth upper and thirteen-tooth

The eleven-tooth upper and thirteen-tooth lower size and profile with 5mm bolt-holes are designed as an upgrade for most 11-speed Shimano GRX derailleurs

It is engineered to stick to the balls and continually be pulled back into the ball path where it is needed

Our bearings are always engineered with the deepest grooved races possible to accommodate maximum sized balls and feature dual-lip seals that provide superior protection against the elements

Puller 24-25 SS - Stainless Steel

ACB 4545 150 BO - 1-1/2 Black-Oxide treated Angular Contact Headset Bearing (40x52x7 -45/45) TH-873 The eleven-tooth upper and thirteen-toothACB 4545 150 BO 1 1 2 Black Oxide Angular Contact Headset bearing (40mm x 52mm x 7mm: 45x45 deg) 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: HSS 6011 BAA0695K TH