The Ultra-Lightweight TT was a motorcycle road race that took place during the Isle of Man TT festival, an annual event at the end of May and beginning of June.
[1] The 1924 Isle of Man TT was the first race for Ultra-Lightweight motorcycles not exceeding 175 cc engine capacity, won by Jack Porter, on a New Imperial at an average speed of 51.21 mph (82.41 km/h) for three laps of the Snaefell mountain course.
The Ultra-Lightweight TT race was re-introduced for the 1951 Isle of Man TT race for motorcycles not exceeding 125 cc engine capacity until dropped from the TT race meeting in 1974.
The Ultra-Lightweight race was re-introduced for the 1989 TT races, again for motorcycles not exceeding 125 cc engine capacity and was part of the TT Festival until 2004.
The lap record for the Ultra-Lightweight TT is 19 minutes and 18.2 seconds[2] at an average speed of 110.52 mph (177.86 km/h) set by Chris Palmer during the 2004 Ultra-Lightweight 125 cc TT Race.