Insert your existing alloy wheel and tyre specs, and the desired size. The outcome is shown on the diagram.

Your existing setup

Existing Tyre
Existing Wheel

Your new setup

New Tyre
New Wheel
Your Results

Existing

New

Diameter
636.8mm
737.5mm
Circumference
2000.6mm
2316.9mm
Poke
48.9mm
74.3mm
Inset
128.9mm
154.3mm
Speedo error
0%
-13.65%
Reading at 30mph
30mph
25.9mph
Reading at 60mph
60mph
51.81mph
Ride height gain
0mm
50.35mm
Arch gap loss
0mm
50.35mm
Wheel Fitment Guide

Compared to your existing wheel, this new wheel will have an inner rim which is 25.4mm closer to the suspension strut. The outer rim will poke out 25.4mm more than before.

The strut shown in the diagram is for show only. Don't worry if the wheel looks like it fouls!

Bear in mind most tyre manufacturers vary slighty from the specs, and that it could be dangerous to run tyres on wheels they aren't designed to fit.


Will They Fit - The No.1 Online Alloy Wheel & Tyre Fitment Calculator

Use our comprehensive online wheel size calculator to visualise different alloy wheels and tyre combinations. Calculate your offset, compare tyre stretch, rolling radius and more. Compare your new and existing setup and our tool will show you key measurements for accurate wheel and tyre fitment.