4x4 Tyre Size Calculator

Original Tyre	New Tyre
Width: Profile: Size:	Width: Profile: Size:

Rim Diameter: mm Sidewall Depth: mm Total Diameter: mm Rolling Circumference*: mm	Rim Diameter: mm Sidewall Depth: mm Total Diameter: mm Rolling Circumference*: mm
Changing your wheels/tyres may effect your speedometer reading! With this new combination your speed will be % of that inidicated. When your speedo reads mph you will actually be doing mph Points to note: 1 inch = 25.4mm (Tyre & wheel manufacturers mix mm and inches in their ratings) Remember: A Speedometer error means an odometer error too! * As tyres deform under load, a tyre does not roll like a solid wheel. It's Rolling circumference is calculated using a deformation factor (DF) x total diameter x pi. DF is typically 0.96 . If required, you can change the deformation factor here:

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