Black Bearing headset bearings are machined and assembled to precise tolerances.

Please check precise measurements against the below to determine the correct size.

SPECIFICATIONS

STEERER DIAMETER: 1-1/2″
OUTER DIAMETER:51mm
INNER DIAMETER:40mm
HEIGHT:6.5mm
CHAMFER ANGLES:36/36

• Chrome steel balls SAE52100
• Chrome steel races SAE52100
• Premium quality grease
• Also referred to by the following part codes: TH-072, MR006