Lucie, Florida, orthopedic surgeon who's been a dirt-track racing fan since he watched his father drive midget racers in the 1950s.

FORBES: Real men eat dirt

Lucie, Fla. orthopedic surgeon who's been a dirt-track racing fan since he watched his father drive midget racers in the 1950s.

FORBES: Real men eat dirt

But it also had some non-original parts, including Model A cranks and rods, an overhead valve unit built for 1920s dirt-track racing and dual carburetors from the 1930s.

FORBES: Flivver Beats Hummer

Dirt-track racing has its roots in the very beginnings of the sport, and there are still hundreds of tracks scattered around the U.S., with particular concentrations in Texas, California, Ohio and western Pennsylvania.

FORBES: Real men eat dirt

Dirt-track racing has its roots in the very beginnings of the sport and there are still hundreds of tracks scattered around the country with particular concentrations in Texas, California, Ohio and western Pennsylvania.

FORBES: Real men eat dirt

Bicycles come in many different forms: racing, mountain, touring, hybrid, track, utility, cruiser, fixed-wheel, dirt-jumper, porteur, BMX.

ECONOMIST: How Robert Penn found himself the perfect two-wheeler