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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; this season and in 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 for the normal time-trial format of the Isle of Man TT Races. The first winner of the Ultra-Lightweight TT in 1924 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 TT 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 60 plus mph average lap. The Lightweight TT and the Senior TT races where run in conjunction and Eddie Twemlow (the brother to Ken Twemlow) riding a New Imperial won the 6 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 6 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).
| Rank | Rider | Team | Speed | Time | Laps |
|---|---|---|---|---|---|
| 1 |  Alec Bennett |
Norton | 3.40.24.6 | 61.64 mph (99.20 km/h) | 6 |
| 2 | Harry
Langman |
Scott | 3.41.54.2 | 61.23 | 6 |
| 3 | Freddie W
Dixon |
Douglas | 3.45.46.4 | 60.17 | 6 |
| 9 |  J A
Stuart |
Norton | 3.59.05.0 | 6 |
6 laps (226.38 miles) - Mountain Course.
| Rank | Rider | Team | Speed | Time |
|---|---|---|---|---|
| 1 | Kenneth
Twemlow |
New Imperial | 56.68 mph | 4:04.49.0 |
| 2 | S.
Ollerhead |
DOT | 54.91 mph | 4:07.26.2 |
| 3 |  I. H. R.
Scott |
AJS | 54.55 mph | 4:09.01.6 |
| 4 | Cecil
Ashby |
Montgomery | 53.39 mph | 4:14.27.4 |
| 5 | Harold J.
Willis |
Montgomery | 52.80 mph | 4:17.18.8 |
| 6 | J. L. E.
Emerson |
DOT | 4:20.39.8 | |
| 7 | F.
Simpson Jnr |
Excelsior | 4:28.55.2 | |
| 8 | L.
Nicholson |
OEC-Blackburne | 4:31.38.0 | |
| 9 | F. R.
Marston |
AJS | 4:31.39.0 | |
| 10 | J. W.
Shaw |
Zenith | 4:43.48.4 |
6 laps (226.38 miles) - Mountain Course.
| Rank | Rider | Team | Speed | Time |
|---|---|---|---|---|
| 1 | Edwin
Twemlow |
New Imperial | 55.44 mph | 4:05.03.0 |
| 2 | H. F.
Brocklebank |
Cotton | 52.85 mph | 4:17.05.0 |
| 3 | J.
Cooke |
DOT | 52.54 mph | 4:18.03.0 |
| 4 | L. J.
Cridland |
JES | 51.84 mph | 4:22.03.0 |
| 5 | P.
Pike |
Levis | 51.16 mph | 4:25.31.0 |
| 6 | H. F.
Harris |
New Imperial | 50.50 mph | 4:29.01.0 |
| 7 | F.
Simpson Jnr |
Excelsior | 4:32.50.0 | |
| 8 | C. G. S.
Cleare |
OK-Supreme | 4:38.50.0 | |
| 9 |  C. W.
Johnston |
Cotton | 4:40.23.0 | |
| 10 | Geoff
S.Davison |
Levis | 4:52.40.0 |
3 laps (113.00 miles) - Mountain Course.
| Rank | Rider | Team | Speed | Time |
|---|---|---|---|---|
| 1 | Jack
Porter |
New Gerrard | 51.93 mph | 4:21.37.0 |
| 2 | Bert le Vack |
New Imperial | 51.14 mph | 4:26.19.0 |
| 3 | D.
Hall |
Rex-Acme | 49.53 mph | 4:34.20.0 |
| 4 | R.
Gray |
Rex-Acme | 49.31 mph | 4:35.29.0 |
| 5 | N.
Black |
Cedos | 49.25 mph | 4:35.36.0 |
| 6 | L.
Horton |
New Imperial | 49.15 mph | 4:36.29.0 |
| 7 | P.
Pike |
Levis | ||
| 8 | Wal L.
Handley |
OK-Supreme | ||
| 9 | P.
Walker |
Excelsior | ||
| 10 | F.
Simpson Jr |
Excelsior |
| Rank | Rider | Team | Speed | Time | Laps |
|---|---|---|---|---|---|
| 1 | George H
Tucker |
Norton | 2.07.48 | 51.31 mph (82.58 km/h) | 3 |
| 2 | Harry
Reed |
DOT | 3.26.44.0 | 43.80 | 3 |
| 3 | A
Tinkler |
Matador | 3.33.08.0 | 42.49 | 3 |
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   | Detailed race results - Race Results - The official Isle of Man TT website |
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