Between 1907 and 2009 (at the end of 2009 TT races period) there have been 231 deaths during official practices or races on the Snaefell Mountain Course (this number includes the riders killed during Manx Grand Prix and the Clubman TT races).
In the early 21st century, the premier TT racing bikes complete the Snaefell course at an average speed exceeding 120 mph (193 km/h). Record holders include David Jefferies who set a lap record of 127.29 mph (204.81 km/h) in 2002. This was surpassed by John McGuinness during the 2004 TT on a Yamaha R1 setting a time of 17 min 43.8 s; an average lap speed of 127.68 mph (205.43 km/h). McGuinness lowered this even further at the 2007 TT, setting a time of 17:21.99 for an average speed of 130.354 mph (209.35 km/h) becoming the first rider to break the 130 mph limit on the Snaefell Mountain circuit. The most successful rider was Joey Dunlop who won 26 times in various classes from 1977 to 2000.
Wereldbefaamd,maar best ook wel gevaarlijke track
