You don't think the interpersonal relationships among Dave and his father and mother weren't fairly "deep" (at least as Hollywood movies go.) Or the conflicts and motivations among his group of friends and how they are all facing (or not) the prospect of the end of high-school? Or the relationship of the townies vs. the college folks?

I think of this as a coming-of-age story with bikes as much as a movie about bikes. Now I gotta go watch it again