These sleazy riders receive a citation and a C- for being decidedly middle of the road. Dax Shepard wrote, directed and stars as Jon opposite Michael Peña’s Ponch in the buddy comedy film based on the vintage TV show CHiPS, and the West coast chill vibe is so pervasive that the movie nearly forgets to identify a protagonist or conflict. By the time it introduces eyebrow-raising vulgarities and daredevil motorcycle stunts, the flourishes seem largely superfluous. Peña is the comic find here, playing against his usual stoic dramatic type to quite enjoyable effect. Shepard exerts occasional wit and flair behind the camera and proves a deft physical comedian. Together the central duo has good chemistry but not much to do. 21 Jump Street did this same shtick better.