Christian Movies/Christian Children's film mid 70's - mid 80's?
My memory isn't very good, but I remember:
A boy has a bike and likes to ride it, but there's a gang of other boys on bikes that don't like him. They get in a fight after he slashes another boy's bike tire. Later a christian girl pushes him out of the path of a car and gets hit herself.
I saw this as a child in vacation bible school in the mid 80's.
I think the movie you are looking for is called "Home run for rusty", it's been many years since I seen it, but I think the things you talked about are in the film.
They just put this film on DVD, along with 2 other films. Here is a link.
If this is not the film, let me know and I will look into other films.