Wheel set with pre-installed bearings for Longboard Yuneec E-GO. Wheel size: 90mm diameter / 52mm width The wheels on all our electric skateboards for sale are manufactured from polyurethane using superior materials. They provide a comfortable ride even when riding over uneven surfaces or encountering small stones that could stop a regular board. For the technically minded, they are 90 x 52 mm, orange 804C with a hardness rating of SHR83AA, an 80 elastic rebound elasticity and Abec 9 bearings.