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: 1-1/4″
OUTER DIAMETER:41.8mm
INNER DIAMETER: 32.8mm
HEIGHT:6mm
CHAMFER ANGLES:45/45

• Chrome steel balls SAE52100
• Chrome steel races SAE52100
• Premium quality grease
• Also referred to using the following part code: MR136
• Upper bearing used in Giant OD2 headset assemblies