Calculators

Fuel consumption

Use the calculator to see what happens to your speedometer reading when you change the size of your tires and wheels.

Original tyre size: / R

New tyre size: / R

	Original tyre	New tyre
	185/65 R14	205/50 R15
Radius, mm
Circumference, mm
Circumference difference, mm
Circumference difference, %
Vehicle speed as speedometer reading is:*
50 km/h	50
80 km/h	80
100 km/h	100
120 km/h	120

* Note: it is assumed that speedometer shows real speed with original tyres.