Street racers aren’t criminals. To me, being a criminal means intentionally hurting people, scamming, stealing, or exploiting others. Street racing is illegal, sure, but most people do it as a hobby because they love cars and racing and just becuase you break the law doesn’t make you a “criminal”. I hate how games like Need For Speed always paint racers as villains when the reality is way less black-and-white.
Are they speeding? Then they are committing crimes, ergo they are criminals by the definition of the word.
Even if you ethically limit crime to harmful behavior, the risk to pedestrians and other traffic still paints them as criminals.
There are reasons they aren’t racing at a track, and part of it is the thrill of someone potentially getting hurt, or arrested. So even by your definition, they are criminals.
Now skateboarding is not a crime. Public nuisance, perhaps, at worst, but not a crime.