Hi everyone

I saw this movie maybe 7 or 10 years ago.

Unfortunately I don't remember its title or actors names.

The subject is:
There are bike riding kids who do not want a girl in their group but a talented girl in town want to join their group. Then boys give her a very difficult quest which is riding bike slippery downstairs and she did it also she count the number of steps while she was riding.

I know there is little information about it but all I can remember is this. I hope you know that movie.