It provides a mount for the tire.
To mount the tire onto
A motorcycle tire is a directional tire, for traction. If you put the tire on backwards and you end up on wet pavement you could seriousley be hurt.
Tire rotation can be tricky, usually because tire rotation is dependent on tire and drive type. However, in all wheel drive vehicles, with non directional tires, it is pretty simple. The front passenger wheel is changed out with the back driver side wheel, the front driver side wheel changed out with the rear passenger wheel.
Can be tire out of balance, bent wheel, defective tire, broken motor mount, or bent drive shaft.
On a machine specifically designed to mount tires on a wheel.
Inexpensive tire and wheel packages can be most likely be found at your local tire and wheel specialist. Most of these companies have monthly special which include tyres and wheels in one package.
Its bad in that it will cause your vehicle to handle properly. I once had my front left directional tire mounted backwards and the car handled funny. It wasnt until I took it in and the guy at wheel works noticed and mounted the tire properly. After that my cars handling was awesome
A non directional tire has a tread design that is the same regardless of mounting direction. A directional tire normally has a v-grooved tread pattern designed to give better traction and handling at high speeds and wet road conditions and are usually used on high performance cars.
What does tightening your tires mean? You mount a tire and tighten the wheel. The wheel it torqued to whatever the manufacture recommends.
Tire out of balance, bent wheel, worn suspension parts, bent drive shaft, or possibly a broken motor mount.
For tire and wheel packages, you can order special tires for rain, snow, and racing, but if you're just looking for everyday driving tires, you can get that as well. Sites like, Tire Rack.com can help you with your decision.