Dirt bikes have a host of cylinder capacities to choose from, varying from a small 50cc engine to monstrous 500cc engines. Perhaps most intriguing are the dirt bikes in the 150cc cylinder capacity.

True to their off-road nature, Beta dirt bikes are low on frills but ... each with a choice of 500cc, 620cc, and 700cc engines. These are dedicated off-road machines, as evidenced by the lack ...

Kilkenny set a new AMA national record, he was the fastest 500cc sit-on bike at the event and the bike he rode, the Cardboard Robot KX500, is the World's Fastest Dirt Bike.

a trail bike, with reasonable suspension and good manners. And a honkin’ great 500cc engine, knocking out more than 35 horses at 6,500 rpm, pushing about 300-plus pounds down the pavement or over the ...