[1] At the FICM (later known as FIM) meeting in London near the end of 1948, it was decided there would be a motorcycle World Championship along Grand Prix lines.

Harold Daniell, on a Norton, won the 500 cc Senior TT event at an average speed of 86.93 mph.

Les Graham, on an AJS Porcupine 500 cc twin, led the Senior race until the last lap when his magneto drive sheared.

As he had finished the race he gained one championship point for recording the fastest lap.

British 350 cc rider Ben Drinkwater was killed in the Junior TT race at the 11th Milestone.