Chevrolet C20 wheel & tyre specs

Rim Specs

Rim Size

You can buy custom wheels for Chevrolet C20 with the same diameter, offset and rim size as your factory wheels. Or you can go with a set of aftermarket wheels that are bigger, wider and with less offset for a truly custom look. It is almost always possible to replace factory Chevrolet C20 wheels and run with a bigger rim size on it without too much trouble.

Bolt pattern

The first number is the number of bolts (or nuts), the second number is the diameter in mm they are located on, also is called PCD (Pitch Circle Diameter).

Center Bore

The diameter of the centre bore that is measured from the side of the attachment plane. This parameter is called the DIA of the disk. The DIA is measured in mm.

Thread Size

Fastener Size. The marking on the fastening bolt M12x1.5 stands for a thread with a nominal diameter of 12 (mm), a thread pitch of 1.5 (mm).

Wheel Fasteners: Lug bolts

They are used as wheel fasteners - Bolts or nuts.

Lug Nut Torque

When installing the wheels on your car, there are two basic rules to follow: apply the necessary force to your lug nuts and tighten them crosswise - this will allow you to create the required tension, and you will be sure that the wheels will sit firmly in their place.

Rim Width

Wheel width is measured as the distance from the front to the rear seat. Wider rims improve handling - the car will skid less in corners, even at high speeds.

Wheel Offset

Wheel offset is typically represented as a positive, negative, or zero value. It is the distance between the centerline of the wheel and the mounting surface where the wheel attaches to the hub.


Describes the distance between the inboard edge of a wheel and the mounting surface where the wheel attaches to the vehicle's hub. Backspacing is vital when fitting wheels onto a car because it affects how the wheel will sit within the wheel well.

Tyre Specs

Take the choice of your car tyres seriously because not only your comfort but also your safety depends on it. In addition to choosing a proven manufacturer, you need to consider the following factors: width and height so that the wheel stays firmly in its place and does not rub your fenders and mudflaps, as well as the speed index and load, depending on your goals and the conditions in which the tyres will be used.

Sidewall Height

Sidewall height is measured from the ground to the wheel rim. The higher the tyre, the higher the car's ground clearance, making it easier to overcome potholes and bumps without worrying about damaging the underside of the vehicle.

Tyre Pressure

The pressure in your tyres must meet the manufacturer's recommendations. Too little or too much air in your wheels may lead to rapid tread wear and poor vehicle handling, which is particularly noticeable at high speeds.

Wheel Diameter

This parameter is the distance across the wheel, passing through its centre, from one rim edge to the opposite edge. When you choose a tyre, you should match it to the rim size you already have - look at the markings on the sidewall.


The larger the diameter of the wheel, the higher its circumference. If you put oversized wheels on your car, remember that this can affect fuel consumption - the engine will need more energy to put these wheels in motion.


The number of revolutions a wheel makes per kilometre of driving depends directly on its diameter, and the bigger the wheel, the fewer revolutions it makes. Do not put gigantic wheels on your car - it creates a heavy load on the engine and gearbox and leads to incorrect operation of the speedometer and odometer.

Wheel to Tyre Ratio

The height of the tyre is defined as a percentage of its width. If the tyre aspect ratio is listed as 60, then the tyre height is 60% of the width.