In the 1928 Isle of Man Tourist Trophy the newly developed 'positive-stop' foot gear-change by Velocette gave Alec Bennett his fifth TT Race win in the 1928 Junior, in the time of 3 hours, 50 minutes and 52 seconds, at an average speed of 68.65mi/h, and setting a lap record at an average speed of 67.19mi/h, with his teammate Harold Willis coming second.
The 1928 Lightweight TT Race was led from start to finish by Frank Longman on an OK-Supreme motorcycle at an average speed of 62.87mi/h. In contrast the 1928 Senior TT Race was held in heavy rain and mist. The bad race conditions produced many retirements and a slow average speed. The eventual winner of the 1928 Senior TT Race was Charlie Dodson, riding a Sunbeam motorcycle, in 4 hours, 11 minutes and 40 seconds, at an average speed of 62.98mi/h.
| Rank | Rider | Team | Speed | Time | |
|---|---|---|---|---|---|
| 1 | Charlie Dodson | Sunbeam | 62.98 mph | 4.11.40.0 | |
| 2 |  George Rowley | AJS | 61.27 | 4.18.41.0 | |
| 3 | 60.89 | 4.20.18.0 | |||
| 4 |  Henry Tyrell-Smith | Rudge | 60.52 | 4.21.58.0 | |
| 5 | Stanley Woods | Norton | 60.42 | 4.22.19.0 | |
| 6 | Ted Mellors | Norton | 59.77 | 4.25.10.0 | |
| 7 |  Francesco Franconi | Sunbeam | 59.61 | 4.25.53.0 | |
| 8 | John Duncan | Raleigh | 59.59 | 4.26.00.0 | |
| 9 | Arthur Warwick | P&M | 59.15 | 4.27.58.0 | |
| 10 | Bill Quinn | 59.13 | 4.28.04.0 |
| Rank | Rider | Team | Speed | Time | |
|---|---|---|---|---|---|
| 1 | Velocette | 68.65mi/h | 3.50.52.0 | ||
| 2 | Harold J Willis | Velocette | 67.16 | 3.56.00.0 | |
| 3 | Kenneth Twemlow | DOT | 66.67 | 4.08.57.0 | |
| 4 | Syd Crabtree | Excelsior | 63.16 | 4.10.57.0 | |
| 5 | Freddie Hicks | Velocette | 63.11 | 4.11.09.0 | |
| 6 | George Reynard | Royal Enfield | 62.9 | 4.12.00.0 | |
| 7 | Cecil Ashby | Raleigh | 62.2 | 4.15.19.0 | |
| 8 | Sidney Jackson | Montgomery | 61.8 | 4.16.13.0 | |
| 9 | Bernard Laurence Hieatt | Cotton | 61.3 | 4.18.34.0 | |
| 10 | Chris Tattersall | DOT | 60.7 | 4.21.00.0 |
| Rank | Rider | Team | Speed | Time | |
|---|---|---|---|---|---|
| 1 | OK-Supreme | 62.9 mph | 4.11.59.0 | ||
| 2 | C S Barrow | Royal Enfield | 58.92 | 4.29.01.0 | |
| 3 | Edwin Twemlow | DOT | 58.83 | 4.29.26.0 | |
| 4 | George Himing | OK-Supreme | 58.4 | 4.31.30.0 | |
| 5 | Cecil Ashby | OK Supreme | 57.9 | 4.33.31.0 | |
| 6 | Vic Anstice | OK Supreme | 57.7 | 4.34.31.0 | |
| 7 | Sammy Jones | New Imperial | 57.1 | 4.37.38.0 | |
| 8 | Jock Porter | New Gerrard | 56.8 | 4.39.15.0 | |
| 9 | Sid Gleave | New Imperial | 56.4 | 4.41.17.0 | |
| 10 | Gordon Burney | Royal Enfield | 55.6 | 4.45.12.0 |