1-1/2" tapered headset bearing(bottom bearing) ACB518K(FSA bearing number TH-073)
Basic size : ID 40 × OD 51.8 × H 8 mm
Angle : 36°/45°(inner race/outer race)
Finishing : inner ring with blac oxide treatment
Mateiral : chrome steel SAE 52100 for races and balls
Cage : Nylon PA66+25%GF
Grease : Mobil XHP-222
Seal : single-sealed