Junior high school is the age when kids are too cool even to say hello to friends. Mostly they nod with faux-indifference and shrug back an acknowledgment. They begin to get over it around age 18 or so.

You're more likely to get a response from a cool nod or finger wave without actually taking a hand off the handlebar.

Or do a wheelie, stoppie, or some of this and you might get a golf clap.