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Tire Data Calculator

Tire Data Calculator
(updated Dec 2018)

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Explanations for the Input and Output values can be found on the Tire Data Information page.

To calculate the tire-geometric data:
Input the following Tire specific data:
- Tire Section Width
- Tire Aspect Ratio
- Rim Diameter
- Rim Width
Select:
- Tire Load Index Number
- Tire Speed Index Letter
Input the following Vehicle specific data:
- Tire Air Pressure
- Vehicle Speed
- Vehicle Corner Loads

Static Input Data Value Tire 1 Value Tire 2
Tire Section Width in mm
(e.g. 245 mm as in 245/45 R 17 95W)
Aspect Ratio in %
(e.g. 45% as in 245/45 R 17 95W) **
Rim Diameter in inches
(e.g. 17" as in 8Jx17)
Tire Load Index Number
(e.g. ‘95’ as in 245/45 R 17 95 ZR)
Tire Speed Rating Letter
(e.g. ‘ZR’ as in 245/45 R 17 95 ZR)
Chosen Rim width in inches
(e.g. 8" as in 8Jx17)




Static Output Data Result Tire 1 Result Tire 2
Spec. Design Rim width
(mfr’s measuring rim)
Spec. Tire Outer Diameter
(at spec. air pres. and no load)
Spec. Tire Section Width
(at spec. air pres. and no load)
Spec. Tire Section Height
(at spec. air pres. and no load)
Spec. Static Load Radius
(@ spec. max load and spec. air pres.)
Spec. Tire Rolling Circ.
(@ 60 km/h, spec. load and spec. air pres.)
Spec. Dynamic Rolling Radius
(@ 60 km/h, spec. load and spec. air pres.)
Spec. Tire Stiffness Rate
(@ spec. load and air pres.)
Tire Air Volume
(@ spec. load and air pres.)

Dynamic Input Data Value Tire 1 Value Tire 2
Veh. Corner Wt. in kg
(Input weights right/left or front/rear)
Air Pressure in bar (kPa/100)
(See chart on Tire Data Info page)
Vehicle Speed in km/h


Dynamic Output Data Result Tire 1 Result Tire 2
Vehicle Tire Lower Section Width
(@ vehicle load, speed and air pres.)
Vehicle Tire Lower Section Height
(@ vehicle load, speed and air pres.)
Vehicle Tire Deflect.
(@ vehicle load, speed and air pres.)
Vehicle Tire Rolling Circ.
(@ vehicle load, speed and air pres.)
Vehicle Dynamic Rolling Radius or
Vehicle Static Loaded Radius if speed = 0

(@ vehicle load, speed and air pres.)
Vehicle Tire Stiffness Rate
(@ speed and air pres.)
Contact Patch Width
(@ vehicle load, speed and air pres.)
Contact Patch Length
(@ vehicle load, speed and air pres.)
Contact Patch Area
(@ vehicle load, speed and air pres.)
Speedo Reading
(Tire 1 is assumed accurate)
Tire Susp. Comfort Value

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