John Tomac (born November 3, 1967, in Owosso, Michigan) is an American former professional cyclist who competed from 1985 to 2005.;[17] He is of Croatian ancestry.

In 1986, Tomac made two significant decisions: he relocated to Southern California, and left BMX competition in favour of mountain bike racing.

The first true World Championships for XC and DH, sanctioned by the Union Cycliste Internationale, were held in Durango, Colorado, in 1990 where John placed 4th in the downhill.

John is well remembered for riding road style drop bars on his Yeti mountain bike at this race which was a noticeable deviation from the other riders.

[6] Tomac's results and rapid rise to prominence earned recognition from U.S. cycling magazine Velo News, which voted him the world's best all-round rider of 1988.

A stronger mountain bike season culminated in UCI World Championship success in Ciocco, Italy, with Gold in XC and Silver in DH.

An accident in which Tomac struck an errant spectator in the final event at Mount Snow, Vermont, prevented him from outscoring his rival and retaining the title.

In 1993, Tomac was the runner-up to Germany's Jürgen Beneke in the inaugural UCI Downhill World Cup and lost out to Frischknecht again in the XC rankings.

Between 1994 and 1997, Tomac would win three more NORBA titles – two in DH and one in XC – as well as some notable individual events such as the Sea Otter Classic and Cactus Cup.

[11] Tomac ended his participation in pro-level road racing at the close of the 1991 season, choosing instead to focus on his mountain biking career.