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Stainless Steel Head Race Cup (PN: 66-4149)

Upgrade your classic British motorcycle with this premium CNC-machined stainless steel replacement head race cup. This precision-made upgrade over the original mild-steel item offers superior strength and greatly improved corrosion resistance.

Two of these cups are used in a standard set-up — one in the top and one in the bottom of the frame neck.

ALSO AVAILABLE AS PART OF OUR COMPLETE HEAD RACE KIT

Key Features:

Part Number: 66-4149

Material: Stainless steel

Dimensions (approximate, for identification purposes only):

  • Outer Diameter (OD): 2⅛" (54 mm)
  • Inner Diameter (ID): 1½" (38 mm)

Note: Measurements are approximate and taken on an unfitted part. Please verify compatibility with your model before ordering.


Compatibility: This head race cup was originally fitted to a wide range of BSA models with telescopic forks including:

A7, A10, A50 (OIF), A65 (OIF), B31, B33 and M-group models with telescopic forks.

It may also fit other models — please confirm using the part number and dimensions.


Proudly produced in Cornwall, England by CPC Engineering using precise CNC manufacturing techniques for consistent quality and performance.

66-4149 - Head race cup

  • £18.00

  • Ex Tax: £15.00

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