Another important component of vehicle safety is tires and wheels. You must check the tires and wheels of your vehicle as part of the pre-trip inspection to ensure they meet safety standards. For example, you must check your tires to ensure they have appropriate tread depth; and check your wheels to ensure they are securely attached. The rear tire of a motor vehicle must not have less than 1.5 millimetres (0.06 in.) of tread measured in two adjacent tread grooves. The front tires of a motor vehicle with a gross vehicle rating of more than 4,500 kilograms must have at least 3 millimetres (0.12 in.) of tread measured in two adjacent tread grooves.
It is also a good safety practice to inspect the wheels, wheel fasteners and tires after having new tires or wheels installed, or if the wheels have been removed for repairs to other components. Wheel manufacturers recommend having wheel fasteners re-checked between 80 km and 160 km after installation. Wheels and tires must be installed by a certified tire installer or a mechanic.