In 1989, he won his first Superbike World Championship race in New Zealand, the first ever British rider to win at a World Superbike event and came runner up in the British Formula TT Championship.

Rymer ended the 1989 season with a victory at the prestigious Mallory Park Race of the Year.

[1] In 1990 he won the British Superbike Championship and repeated his victory at the Mallory Park Race of the Year.

He rode a privateer Harris-Yamaha at the 1992 British motorcycle Grand Prix and placed 6th.

[4] Subsequently, he returned to the British Superbike championship with some success – five race wins in 1996 with a Ducati, and one in 1998 for Suzuki.