|Isle of Man TT|
International Motor-Cycle Cup Race (1905)
For the 1905 Gordon Bennett Eliminating Trial it was decided to run an eliminating trial for motorcycles the day after for a team to represent Great Britain in the International Motor-Cycle Cup Races. An accident at Ramsey Hairpin forced-out one of the pre-race favourites and the inability of the motorcycle competitors to climb the steep Mountain Section of the course forced the organisers to use a 25-mile section of the Gordon Bennett Trial course. This ran from Douglas south to Castletown and then north to Ballacraine along the primary A3 road and returned to the start at the Quarterbridge in Douglas via Crosby and Glen Vine along the current Snaefell Mountain Course in the reverse direction. The 1905 International Motor-Cycle Cup Race for 5 laps (125 miles) was won by J.S. Campbell (Ariel) despite a fire during a pit-stop in 4 hours, 9 minutes and 36 seconds at an average race speed of 30.04 mph.
Isle of Man TT Race (1907)
The Norton Twin motorcycle which won the first Isle of Man TT races in 1907.
BAT single-cylinder motorcycle
During the 1906 International Cup for Motor-Cycles held in Austria, the event was plagued by accusations of cheating and sharp practices. A conversation on the train journey home between the Secretary of the Auto-Cycle Club, Freddie Straight and the brothers from the Matchless motorcycle company, Charlie Collier and Harry Collier and the Marquis de Mouzilly St Mars led to a suggestion for a race the following year for road touring motorcycles based on the automobile races to be held in the Isle of Man on closed public roads. The new race was proposed by the Editor of “The Motor-Cycle” Magazine at the annual dinner of the Auto-Cycle Club held in London on 17 January 1907. It was proposed that the races would run in two classes with single-cylinder machines to average 90 mpg-imp (0.031 l/km) and twin-cylinder machines to average 75 mpg-imp (0.038 l/km) fuel consumption. To emphasise the road touring nature of the motorcycles, there were regulations for the inclusion of saddles, pedals, mudguards and exhaust silencers and the first event, the 1907 Isle of Man TT race, was won by Charlie Collier at an average race speed of 38.21 mph and the winner of the twin-cylinder class was Rem Fowler riding a Norton motorcycle at an average race speed of 36.21 mph.
For the 1908 race, the fuel consumption was raised to 100 mpg-imp (0.028 l/km) for single-cylinder machines and 80 mpg-imp (0.035 l/km) for twin-cylinder machines and the use of pedals was banned. The race was won by Jack Marshall on a Triumph motorcycle at an average speed of 40.49 mph. For the 1909 Isle of Man TT races, the fuel consumption regulations was abandoned along with the use of exhaust silencers. The single-cylinder machines were limited to a capacity of 500 cc and the twin-cylinder machines to a 750 cc engine capacity. Due to the concern over increasing lap-speed, for the 1910 Isle of Man TT the capacity of the twin-cylinder machines were reduced to 670 cc. However, Harry Bowen riding a BAT twin-cylinder motorcycle increased the lap record to an average speed of 53.15 mph (85.54 km/h), later crashing-out of the 1910 event on the wooden banking at Ballacraine corner.