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″
OUTER DIAMETER:38mm
INNER DIAMETER: 27.15mm
HEIGHT:6.5mm
CHAMFER ANGLES: 36/45

• Chrome steel balls SAE52100
• Chrome steel races SAE52100
• Premium quality grease
• Also referred to using the following part codes: TH-373, MR-055