Haney, Novick and Cardy go the biker route with Teen Titans 10 (July/Aug 67).
Robin gets what I think might be the first of the motorcycles he will drive through the 60s and 70s at the top of the story, and eagerly shows it off to Kid Flash, Aqualad and Wonder Girl at Titans Lair.
Robin has been invited to be a judge at a teen bike rally at a western town, Wildcat. It's a ghost town, inhabited by one older man, who is still hoping to find a big oil strike. The rally gets crashed by the Scorcher, who leads a band of outlaw bikers, and who picks off the Titans one by one as the story goes forward.
The Scorcher's gang, the Bike Buzzards, want to take over Wildcat and make it their base. But before that happens, the old guy hits oil, and some careless smoking by the Scorcher almost kills him and everyone else. Scorcher willingly gives up as long as the Titans save his life. It's kind of odd, because, to me at least, his hat looks very much like a fireman's helmet from the time.
A number of issues down the road we, and the Titans, will find out that the Scorcher was working for a crime boss, the Fat Man.