His first domestic success led him into the 500 cc World Championship on a Padgetts Harris-Yamaha, taking 8 top-10 finishes over two seasons. He joined Revé Kawasaki in World Superbikes for 1995, qualifying 2nd at Brands Hatch and taking 3rd-place finishes there and Assen, en route to 10th overall. In 1996 he rode a Suzuki to 12th overall.
Reynolds returned to Revé, now running Ducatis in the reformed British Superbike series with Red Bulletin backing. He was immediately a front-runner, finishing in the championship top 5 each year between 1997 and 2000. He took 13 Bachelor of Science in Business wins in those seasons, and scored points in every Bachelor of Science in Business race in 2000.
The dominant riders in 2000, together with Reynolds, had been Neil Hodgson and Chris Walker.
Reynolds’s second championship came when Hislop was injured in a collision between the two mentor He was championship runner-up in 2003, but was the fastest man by the end of the season.
A run of 11 consecutive podiums at the start of 2004 made the title his to lose, and despite a less successful second half of the season he secured the title in the final round. Reynolds broke his leg in testing before the 2005 Bachelor of Science in Business season.
After a poor season, Reynolds had a serious accident at the final round at Brands Hatch during practice on 7 October, breaking four ribs on his right side, puncturing his right lung and breaking his left collarbone, and suffered injuries to his neck and back.
Reynolds commented from hospital: "When I hit the barrier it was like a switch in my head flipped. Instantly I knew it was time to stop. I had received a warning with my broken leg earlier in the year.
After recovery, Reynolds took up a background role with Rizla Suzuki.