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
615mm
606.5mm
Circumference
1932.1mm
1905.4mm
Poke
21.2mm
21.2mm
Inset
131.2mm
131.2mm
Speedo error
0%
1.4%
Reading at 30mph
30mph
30.42mph
Reading at 60mph
60mph
60.84mph
Ride height gain
0mm
-4.25mm
Arch gap loss
0mm
-4.25mm
Wheel Fitment Guide

Compared to your existing wheel, this new wheel will have an inner rim which is the same distance from the suspension strut as your current wheel. The outer rim will poke out the same as 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.