The 1911 Isle of Man TT was the first time the Junior TT race took place and was open to 300cc single-cylinder and 340cc twin cylinder motor-cycles and was contested over 5 laps of the new 37.5 mile Mountain Course. The first event on the new course was the Junior TT Race and was contested by 35 entrants. It was won by Percy J. Evans riding a Humber motor-cycle in 3 hours, 37 minutes and 7 seconds at an average speed of 41.45 mph.
The 1912 event was the first to limit the Junior TT to only 350 cc machines and this engine capacity prevailed until 1994.
Machines complying with 2006 FIM Supersport or 2006 MCRCB Supersport regulations with the amendments specified in the TT Regulations.
Over 400cc up to 600cc 4 cylinders 4-stroke
Over 600cc up to 750cc 2 cylinders 4-stroke
Over 600cc up to 675cc 3 cylinders 4-stroke
Speed and Lap Records
The lap record for the Junior TT is 17 minutes and 42.52 seconds, at an average speed of 127.836 mph set by Michael Dunlop during lap 4 of the 2010 Isle of Man TT Supersport Junior TT Race 2.
Junior TT Race Winners
Junior TT Race Winners by Marque
Winners of Junior/Senior Double Isle of Man TT Races