Tusk Front Aluminum Wheel Spacers 30 mm - Fits: Polaris SPORTSMAN 450 H.O. 2016-2018 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.