 Frith had the distinction of being one of the few to win TT races before and after the Second World War.Frith entered his first major race, the first Manx Grand Prix in 1930 riding an over-the counter, 350 cc Velocette KTT in the Junior event, finishing third at a speed of 60.34 mph.He retired from the 500 cc race with a blown engine, again riding his 350, when holding third place.