Hi thanulee,
Here is your file back: (updated)
https://www.amazon.com/clouddrive/share/kR7gIdFaskVNceQUK90jILIkuLodlpAKOxHfNErcM4a
Somehow there is one object on the back-tire, I guess not intentional.
The idea is to have the length of the Spline (MoSpline) as a base for the rotation and position/orientation.
The bike would certainly tilt in curves, which could be established with a second set up and a target attached to the Parent object.
The two-disc objects with the checker-board are for illustration only; they have no function otherwise.
Enjoy your weekend