The Alloy Wheel Fitment, Tyre Stretch, Rolling Radius & Speedo Error Calculator
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Your Results
Existing
New
Diameter
640.1mm
633.1mm
Circumference
2010.9mm
1988.9mm
Poke
74.3mm
61.6mm
Inset
154.3mm
141.6mm
Speedo error
0%
1.11%
Reading at 30mph
30mph
30.33mph
Reading at 60mph
60mph
60.66mph
Ride height gain
0mm
-3.5mm
Arch gap loss
0mm
-3.5mm
Compared to your existing wheel, this new wheel will have an inner rim which is
12.7mm further away from the suspension strut.
The outer rim will poke out
12.7mm 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.
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.