My Favorite Martian on CBS

Question: I'm trying to recall the title of a movie from the '80s about BMX bike riding. I can't remember if there were any famous actors in it. I just remember there was a big race scene at the end on an obstacle-courselike track, and that the main character's opponents included a set of twins. Any thoughts?

Answer: I'd have to go with Rad (1986), which features Talia Shire, Ray Walston of TV's My Favorite Martian and Olympic gymnast Bart Conner. He's one of the bad BMX riders, and his partners in crime include twins Chad Hayes and Carey Hayes, who went on to become a successful screenwriting team.