John Tomac won his first race at age 17, when in 1984 he won the National BMX Cruiser Class Championship. Since then has crossed over into both road racing and mountain bike racing, excelling at both. He has won more mountain bike races than anyone in the sport, and done so at every level and in all aspects: cross-country, uphill, downhill, even trials. In 1988 and 1990 he won the World Mountain Bike Championships overall title and has claimed many NORBA and national titles. In 1991, won the Grundig World Cup #2 in France, the Italian National Championship Series #1, the NORBA National Championship #1 in Durango, and the Rage in the Sage Circuit Race in Gunnison, Colo. He was voted the top all-around rider in the world in 1988 by Velo-News, and was the Mountain Bike Action Magazine Truck Series Champion in 1987 and 1988. As a roadie, he earned the title of "Best Young Rider" in the 1988 Coors Classic Prologue.