Tusk Rear Aluminum Wheel Spacers 30 mm - Fits: Polaris RANGER RZR 800 2007-2014 Wheel spacers are made from lightweight 6061 T-6 aluminum for superior strength and performance. Each wheel spacer is either 30mm (1 1/8") thick or 45mm (1 3/4") thick. Tusk wheel spacers use a simple installation process. They do not require removing stock studs. Wheel spacers are sold in a pair.