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for Big Twin 1936-1954

Early model belt drives featuring the ultra severe-duty 11mm Aramid Polychain belt. These belt drives are designed for enclosed primary fitment, either within aluminum primaries or within tin (stamped steel) covers. For the later aluminum primary models (1965-1984) two kits are offered for kickstart and electric start models. The earlier tin primary models are available for tapered (1937-1954) or splined shaft (1955-1964) applications, kickstart only.

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Due to various circumstances (improper selection, installation and maintenance) and applications under which belt drives are used, W&W Cycles is not liable for damaged belts.
Belt drive »Brute II Extreme« by Rivera Primo; fits Big Twin 1936-1954; width: 1-1/2”; kickstart only; sprocket shaft type: tapered; pitch: 11 mm; number of teeth: 33 x 49; USA
W&W# Picture net price* Available from warehouse Germany?
80-018 for Big Twin 1936-1954 $831.65 kit
in stock
* United States of America: Tax free shipping. Please check your local import fees.

Spare parts:

  • 80-224

    80-224 Washer by Rivera Primo; for Motor pulley; fits Big Twin →1954; zinc plated; sprocket shaft type: tapered; USA; gross weight: 60 g

  • 80-095

    80-095 Primary belt »Brute II« by Rivera Primo; for 4-speed Big Twin 1936-1984 with 33/49T or 34/49T pulley combination; use with idler assy; aramid/rubber compound; ...

See also:

  • Transmission Adjuster Custom

    Transmission Adjuster Custom Dual adjuster for 4-speed transmissions 1936-64 (tin primary) and 4-speed transmissions thru 1984 with open primary drives.

Have any questions?

  • Our sales team will be glad to help out:
    Mondays - Fridays 08:00-18:00 CET, Saturdays 09:00-13:00 CET
    Phone: +49 / 931 250 61 16
    eMail: sales@wwag.com