| 1924 Isle of Man Tourist Trophy | |
|---|---|
| Date | June 23, 25 and 27, 1924 |
| Location | Douglas, Isle of Man |
| Course | Snaefell Mountain Course 37.739 miles (60.74 km). |
| Organiser | Auto-Cycle Union |
| Clerk | T.W. Loughborough |
| Junior TT | |
| First | Ken Tremlow, New Imperial |
| Second | Syd Ollerhead, DOT-JAP |
| Third | I.H.R. Scott, AJS |
| Fastest lap | |
| Jimmy Simpson 35min. 5sec. 64.54 mph New record | |
| Ultra Lightweight TT | |
| First | Jock Porter, New Gerrard |
| Second | Freddie Morgan, Cotton |
| Third | Chris Stead, Cotton |
| Fastest lap | |
| Jock Porter 43min. 2sec. 52.61 mph New record | |
| Sidecar TT | |
| First | George Tucker, Norton Walter Moore |
| Second | Harry Reed, DOT-JAP Joe Hooson |
| Third | Almond Tinkler, Matador U.R. Tinkler |
| Fastest lap | |
| Freddie Dixon 43min. 32sec. 53.23 mph | |
| Lightweight TT | |
| First | Edwin Tremlow, New Imperial |
| Second | Harry Brockbank, Cotton |
| Third | Jack Cooke, DOT-JAP |
| Fastest lap | |
| Edwin Tremlow 38min. 51sec. 58.28 mph New record | |
| Senior TT | |
| First | Alec Bennett, Norton |
| Second | Harry Langman, Scott |
| Third | Freddie Dixon, Douglas |
| Fastest lap | |
| Freddie Dixon 35min. 31sec. 63.75 mph New record | |
The 1924 Isle of Man Tourist Trophy saw the introduction of the Ultra-Lightweight class for motorcycles of 175 cc capacity that was run only twice, in 1924 and 1925. This was the second year of the Sidecar race that would also be dropped after 1925.
The Ultra-Lightweight TT began with a massed-start for competitors rather than pairs as with the normal time-trial format of the TT races. The winner of the first Ultra-Lightweight TT was Jock Porter riding a New Gerrard at an average speed of 51.21 mph (82.41 km/h).
The Junior TT race was won by Ken Twemlow on a New Imperial at an average speed of 55.67 mph (89.59 km/h). In the same Junior race, Jimmie Simpson set a new lap record of 35 minutes and 5 seconds at an average speed of 64.54 mph (103.87 km/h) on an AJS – the first average lap-speed over 60 mph. The Lightweight and Senior TT races were run in conjunction, and Eddie Twemlow (brother to Ken Twemlow) riding a New Imperial won the six-lap race in 4 hours, 5 minutes and 3 seconds, an average speed of 55.44 mph (89.22 km/h).
The Senior TT, like the Junior race, was also run at a record breaking pace and was the first with a race-average speed over 60 mph (97 km/h). The six-lap race was won by Alec Bennett riding a Norton in 3 hours, 40 minutes and 24. 6 seconds, with an average speed of 61.64 mph (99.20 km/h).