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Alloy Wheel / Tyre Fitment Comparison

We have taken the hard work out of calculating wheel/tyre fitments for you by compiling the below tool. This will allow you enter your existing wheel/tyre specifications and the proposed new fitment, then giving you measurements of how they differ. Unlike other calculation tools on the web, ours is based on real life physical measurements taken from the products themselves, not just using manufacturer nominal dimensions (which is where a big difference can lie), to our knowledge our website is the only one in the world to offer this facility. This also forms the basis for our algorithm that offers you which wheels and tyres will fit your vehicle in our online vehicle search facility, which is regarded as the most advanced in the industry.

We also offer you a visual representation of how the wheel and tyre will look and how the tyre will sit when mounted to the wheel.


Existing Wheel / Tyre Size
The width of the tyre e.g. 225 (the first 3 numbers in the tyre size printed on the tyre sidewall)
The profile of the tyre e.g. 40 (the 4th & 5th numbers in the tyre size printed on the tyre sidewall)
The diameter of the wheel in inches e.g. 18 (often found stamped on the back of the wheel with the letter J)
The width of the wheel in inches e.g. 8.0 (often found stamped on the back of the wheel with the diameter)
The offset of the wheel (ET) in mm e.g. 40 (often found stamped on the back of the wheel)
Proposed Wheel / Tyre Size
The width of the tyre e.g. 225 (the first 3 numbers in the tyre size printed on the tyre sidewall)
The profile of the tyre e.g. 40 (the 4th & 5th numbers in the tyre size printed on the tyre sidewall)
The diameter of the wheel in inches e.g. 18 (often found stamped on the back of the wheel with the letter J)
The width of the wheel in inches e.g. 8.0 (often found stamped on the back of the wheel with the diameter)
The offset of the wheel (ET) in mm e.g. 40 (often found stamped on the back of the wheel)
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