Easy but effective upgrades! Yesterday, this Toyota Crown 12th installed BONOSS Forged Active Cooling Wheel Spacers, front/rear 15mm (3/5 inch), PCD 5×114.3, CB 60.1. Why do wheel spacers do? Wheel spacers are a simple and inexpensive upgrade that provides many advantages to both street cars and off-road vehicles. By sandwiching between the assembly hub and wheel, they create a gap that sets the wheel away to an ideal distance. This increases the distance between the left and right wheels. A wider wheel track offers better traction, leading to more stability and better handling performance, that is why they are often used on many racing cars. These spacers are specifically engineered to give your car better cornering, aerodynamics, and look.