OEM (original equipment manufacturer) wheels are the wheels that come standard on a vehicle. Aftermarket wheels are wheels that are not made by the vehicle manufacturer, but are designed to fit and perform on specific vehicle models.

The correct wheel size for your vehicle will depend on the specific model and year. You can usually find the recommended wheel size in your vehicle's owner's manual or on the vehicle's door jamb.

Hubcentric wheels have a center bore that fits snugly over the vehicle's hub. Lug-centric wheels do not have a center bore, and are instead centered by the lug nuts.

Wheel spacers are not necessary for all vehicles. However, if you are installing wheels that are wider or have a different offset than the original wheels, wheel spacers may be necessary to ensure proper fitment and performance.