Wheel spacers move increase the gap between your wheels and your vehicle's body. They're popular with both street-focused cars and off-roaders. Wheel spacers bolt onto your existing wheel assembly. This increases the space between the wheel hub assembly and the wheel itself. The wheel is set farther outward. It's important to note that spacers don't move the hub assembly, only the wheel. This creates a bigger gap between the wheel and the wheel well. Wheel spacers are only available as an aftermarket part and aren't pre-attached to any vehicles.