We'll assume you mean your back tire, since it usually protrudes farther than the metal wheel: the air pressure may be too low, or the tire may be too large for the application. Any other reason would involve damaged parts, say in an accident.
the normal mm or milimeter of a scooter wheel is 100mm
add a wheel to the middle after doing certain things.
Yes, there is no difference between the bearing slot in any scooter wheel. Any bearing will fit any wheel.
If its the rear then the inside needs to be rolled upwards.
check to see if your wheel is rubbing up against something
This can be a defective left front wheel bearing. Can also be the tire is rubbing against the fender liner. Loose wheel will also cause this. Inspect everything.
The clamp on a scooter gets put on the wheel
You might possibly have a bent drive shaft, or if you have oversized tires they could be rubbing against the wheel wells
loose wheel hub screws.. the brake housing is rubbing against the inside of your wheel because it is loose
remove the steering wheel and use eff-7
Motor, Wheel
You can find parts for your Shuttle Scooter at www.scooterworks.com.