The 1966 Isle of Man TT races were held later in the year than the traditional May/June fortnight due to the seamen's strike which affected access to the Island for all concerned.
[1] After the strike ended in July, the TT races were re-organised to fit with the remaining events in the Grand Prix calendar and preceded the September Manx Grand Prix, meaning nearly a month of continuous disruption to everyday Isle of Man affairs and much concerted effort from the motorcycle trade and journalists together with the many volunteers and support workers.
[2] 3 Laps (113.19 Miles) Mountain Course.
3 Laps (113.19 Miles) Mountain Course.
6 Laps (226.38 Miles) Mountain Course.