Which body sanctions the Isle of Man TT races?

The Isle of Man TT races are sanctioned by the Auto-Cycle Union.

The Auto-Cycle Union, commonly abbreviated ACU, is the United Kingdom’s national governing body for motorcycle sport. It sanctions the TT and has a long-standing role in the event’s organisation. The race itself is organised through ACU Events Ltd, while the Isle of Man Government owns the event’s rights and promotes it.

The TT is not sanctioned by the Manx Motor Cycle Club, although that club has been involved in motorcycle activity on the island and is an easy distractor. The Motorcycle Action Group is a campaigning organisation, not the event’s sanctioning authority. The FIM, or Fédération Internationale de Motocyclisme, is the international governing body and historically governed the TT when it counted toward world championship competition, but the standard answer to this question is the ACU.

The distinction matters because sanctioning, organising, promoting and international rule-making are separate roles. The ACU provides the sporting framework and sanction for the event, which is run on closed public roads around the Isle of Man.