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
625.3mm
614.7mm
Circumference
1964.4mm
1931.1mm
Poke
73mm
74.3mm
Inset
143mm
154.3mm
Speedo error
0%
1.72%
Reading at 30mph
30mph
30.52mph
Reading at 60mph
60mph
61.03mph
Ride height gain
0mm
-5.3mm
Arch gap loss
0mm
-5.3mm
Wheel Fitment Guide

Compared to your existing wheel, this new wheel will have an inner rim which is 11.4mm closer to the suspension strut. The outer rim will poke out 1.4mm 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.