Wheel Offset Chart Calculator

Ozzy Tyres have created this offset calculator to allow you to calculate the difference and effect when changing wheel widths and offset.

  • First step enter your current wheel width and original offset.
  • Second step put the width and offset of the new wheel specs.
  • Click Calculate and you will get the results below.
  • You will be able to see the inner and outer clearance and position. Either less or extra.

Please enjoy using this tool to calculate the positioning of your new wheels. 10-15ml difference is usually safe to fit on most vehicles.
Just remember the higher the offset the wheel sits in further and the low the offset the wheel sits out. 4x4s usually want their new wheels to sit further out so a lower offset is required… (lower number)

Use this calculator to determine the effect of changing your wheel width and offset. First enter your current wheel width and offset. Then enter your new wheel width and offset. Next click the calculate button. It will show the clearance between the inside of the wheel and the strut housing. It will also show how far the outside of the wheel edge will extend or retract. If you reduce the inner clearance too much or push the wheel out too far, the tire might rub or not fit at all. This calculator is for information purposes only and we do not guarantee fitment based on this calculator alone.

Current Wheel Specs



Inner Clearance:
(the inside of the wheel to the strut housing)
Outer Position:
(position of the outside edge of the wheel)


Wheel Offsets

When talking about aftermarket wheels one of the important factors you need to consider is the offset of the new wheel and if it is suitable for your vehicle.

When you order wheel online out technicians match the correct wheel offsets for your vehicle so you don’t have to worry.

The offset of a wheel is the distance from the hub mounting surface to the center line of the wheel. The wheel offset  measurement is in millimetres and results in a positive, negative, or zero offset.

Positive offset is when the hub mounting surface is towards the front or wheel side of the wheel. Majority of newer vehicles have a high offset.. Approximately last 25 years vehicles started running high offsets.

Negative offset is when the hub mounting surface is toward the back or brake side of the wheels centerline. A negative offset wheel usually has a “deep lip” which is seen on older manufactured vehicles.

Zero offset is when the hub mounting surface is even with the centerline of the wheel.

Offset is expressed as an ET number and is stamped on the back of the wheel, (ie is ET38) and the ‘ET’ is a shortened version of the German word ‘Einpresstiefe’ which means ‘insertion depth.’ The number is the distance in millimetres between the centre line and the mounting surface.

Wheel Offset Diagram

Please call 1300699699 to speak to a technician about your wheel offset questions.

Tyre Size Calculator and Comparison

Use this handy tool to measure and compare the size of your existing tyres with the size of your new tyres.