The 1Pro is the season opener for the Super Hooligan racing series.
The bikes being raced range from big 1200cc purpose-built Super Hooligan bikes all the way down to tiny two-stroke bikes for kids.
Super Hooligan is a predominantly amateur series and that opens it up to all kinds of competitors.
The field features men, women and kids aged six to 60.
Unlike more traditional American flat-track racing, Super Hooligan takes place on a lightly banked eighth- or tenth-mile oval.
Most of the races take place on dirt. But at least one in San Pedro, California takes place on pavement.
Hooligan bikes, like flat-track bikes, run with no front brakes.
Prizes range from a couple thousand dollars for the higher classes to little plastic trophies.
The races are short, some lasting little over a minute.
Competition is friendly -- usually -- but fierce.