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This year the St. John's Circuit was abandoned in favour of the Mountain course. The course measured 37.5 miles, about a quarter of a mile shorter than the modern Mountain Circuit.
1911 June 30th. Friday – 4 laps (150 miles) 104 riders entered the race on the new Mountain Circuit. All of the manufacturers had put effort into developing machines suitable for the long climb involved. Although some of the machines only used a single gear, others tried various combinations of transmission and gearing.
During practice Victor Surridge was killed, the first to die in these races.
For the first time the event was split into two separate races. The four-lap Junior event was introduced for 300cc singles and 340cc twins while 500cc singles and 585cc twins contested the five-lap Senior.
Thirty-five riders entered the Junior race and fifty-nine in the Senior race was held three days later
Junior TT Race
Senior TT Race