The diameter of the hole in the middle; must match your car's hub.
You must match these numbers to your vehicle or the wheels won't fit.
Use these if the wheel's center bore is larger than your car's hub. buying wheels for your car
How far the wheel sits in or out of the fender.
See what specs others with your specific car model are running. The diameter of the hole in the middle;
Larger wheels look better but often make the ride harsher.
The way a wheel is made determines its strength, weight, and price. buying wheels for your car
Molten aluminum poured into a mold. Affordable but heavier.