Insert your existing wheel and tyre specs, and the desired size, and 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
641.6mm
654.1mm
Circumference
2015.6mm
2054.9mm
Poke
90.7mm
84.3mm
Inset
150.7mm
144.3mm
Speedo error
0%
-1.91%
Reading at 30mph
30mph
29.43mph
Reading at 60mph
60mph
58.85mph
Ride height gain
0mm
6.25mm
Arch gap loss
0mm
6.25mm
Wheel Fitment Guide

Compared to your existing wheel, this new wheel will have an inner rim which is 6.3mm further away from the suspension strut. The outer rim will poke out 6.3mm less 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.