Existing
Desired
ResetExample values

Tire calculation and/or rim calculation

Tire size
Warning
1: Existing tire / rim
Tire width?
105 - 405 mm
Tire height
25 - 100 %
Tire height?
20 - 55 inch
Tire width
5 - 15 inch
Diameter
5 - 25 inch
Rim width?
3 - 15 inch
Offset
-165 - 165 mm
Spacer
0 - 150 mm
2: Desired tire / rim
Tire width?
105 - 405 mm
Tire height
25 - 100 %
Tire height?
20 - 55 inch
Tire width
5 - 15 inch
Diameter
5 - 25 inch
Rim width?
3 - 15 inch
Offset
-165 - 165 mm
Spacer
0 - 150 mm
1: Enter values
Information
INFORMATION: The ratio of tire width to rim width does not correspond to the standard!
Warning
ATTENTION: Entries (highlighted in red) are out of range! Please correct your entries!

Results

 Existing
 Desired
Tire circumference
?
Rolling circumference
?
Tire height (sidewall)
?
Tire diameter
?
Rim size
?
Rim width
?
Poke (Outer Edge)
?
Inset (Inner Edge)
?
Show results in

Comparison & differences

Circumferential difference
Difference in rolling circumference
?
Speedometer display at real 100 mph or km/h
Speedometer at 100 km/h or mph
?
The following differences also arise:
Difference in ground clearance
?
Change to the outer edge of the rim per side
?
Change to the inner edge of the rim per side
?
Placeholder

Graphic display appears after entering values

The strut illustration is for illustrative purposes only
2: Read the result

Note the difference in rolling circumference:

Rolling circumferences are generally approved in the range +1.5% und -2.5% g. Please check with the responsible inspector beforehand.

Speed deviation outside the norm:

In EU countries, the speedometer may display a maximum of +10 % + 4 km/h and no km/h less than the actual speed driven.
See regulation No 39 of the Economic Commission for Europe of the United Nations (UN/ECE): Point 5.4
Share your calculations

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Feedback
Tire diameter
Tire diameter:
Diameter of the tire.
Rolling circumference
Calculation incl. load from the vehicle and at a speed of approx. 60 km/h (40 mph) (tire circumference * 0.97).
Tire circumference
Purely calculated circumference of the tire without mounting on a rim and without load.
Tire height
Height of the sidewall of the tire.
Rim size
Rim size:
Diameter of the rim.
Rim width
Rim width:
Width of the rim.
Poke (Outer Edge)
Distance between the OUTER rim edge and the contact surface of the brake disk or brake drum.
Inset (Inner Edge)
Distance between the INNER rim edge and the contact surface of the brake disk or brake drum.
Change in ground clearance
Value by which the vehicle is higher or lower with the new tires.
Changing the rolling circumference. If the deviation is too high, it may be necessary to adjust the speedometer.
Displayed speedometer value with desired tires, which corresponds to the displayed 100 mph or km/h with existing tires.
Change outer edge per side
Distance between the outer surfaces of the rims. The rims in the wheel housing move inwards or outwards by this value.
Change inside edge per side
Distance between the inner surfaces of the rims. The ET (offset) has an influence on this value.
Tire info
Tire info
Tire info
Tire info
Tire info
Rim info
Tire info
Tire info
Tire info
Tire info
Tire info
Rim info