Go kart rear axle brake kit 47cc 49cc engine motor tire atv quad e-bike trike us 4.10-6'' knobby wheels tire. Brake Disc Diameter 220mm (8.66). This is a complete rear axle kits for gokart. Don't open the return request. The Axle fits 6 inch-10 inch wheels (rim) with 3 inch bolt to bolt space.