Classes

TT Superbike
Machines complying with World Superbike and/or British Superbike specifications:
Over 750cc up to 1000cc 4 cylinders
Over 750cc up to 1000cc 3 cylinders
Over 800cc up to 1000cc 2 cylinders

TT Superstock
Machines complying with FIM Superstock and/or UEM Stocksport and/or MCRCB Stocksport Specifications:
Over 600cc up to 1000cc 4 cylinders
Over 750cc up to 1000cc 3 cylinders
Over 850cc up to 1200cc 2 cylinders

Supersport Junior TT
Machines complying with FIM Supersport or MCRCB Supersport specifications:
Over 400cc up to 600cc 4 cylinders
Over 600cc up to 750cc 2 cylinders

Senior TT
Any machine eligible for TT Superbike, TT Superstock or Supersport Junior TT.

Sidecar TT
ACU Formula 2 Sidecars