Gearbox & Clutch


SRM offer a Gearbox reconditioning for the following gearboxes

  • BSA singles 'B' and 'M' series
  • BSA twins 'A; series
  • BSA RRT2
  • Triumph Pre Unit Std
  • Triumph Pre unit Slick shift
  • Norton Early 'laydown'
  • Norton/AMC Commando
  • Unit Twins gearboxes


We are able to offer a full reconditioning service for the BSA, TRIUMPH and NORTON gearboxes for the UNIT and PRE UNIT twins. Each gearbox is carefully dismantled and assessed for damage and wear. A full estimate is produced for the rebuild prior to work commencing.

All gearboxes are assembled with the utmost care and all carry a full guarantee


Badly scored bearing surface on this Layshaft can be regound and a special bush made to size.

All the gears are checked for wear and replaced as required. Particular attention is paid to the condition of the teeth on the gears to ensure the harness has not be compromised.