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Tire Data Calculator

Tire Data Calculator
(updated April 2017)

If this calculator doesn't work in this site, try https://bndtechsource.wixsite.com/home/tire-data-calculator

Sorry for any inconvenience. Metric Conversion in JavaScript

Your Browser must be able to run JavaTM to be able to use this program.

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: Rim Width; Rim Diameter; Tire Aspect Ratio; Tire Section 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)
Chosen Rim Width in inches
(e.g. 8" as in 8Jx17)
Tire Load Index Number
(e.g. ‘95’ as in 245/45 R 17 95W)

Tire Speed Index letter
(e.g. ‘W’ as in 245/45 R 17 95W)

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

Dynamic Input Data
Value Tire 1
Value Tire 2
Vehicle Corner Weight in kg
(input weights right/left or front/rear)
Air Pressure in bar (kPa/100)
(See the chart below)
Vehicle Speed in km/h

Dynamic Output Data (Per Veh. Load & A/P) Result Tire 1 Result Tire 2
Vehicle Tire Lower Section Width
(@ vehicle load, speed and air pressure)
Vehicle Tire Lower Section Height
(@ vehicle load, speed and air pressure)
Vehicle Tire Deflection
(@ vehicle load, speed and air pressure)
Vehicle Tire Rolling Circumference
(@ vehicle load, speed and air pressure)
Vehicle Dynamic Rolling Radius or
Vehicle Static Loaded Radius if speed = 0

(@ vehicle load, speed and air pressure)
Vehicle Tire Stiffness Rate
(@ speed and air pressure)
Contact Patch Width
(@ vehicle load, speed and air pressure)
Contact Patch Length
(@ vehicle load, speed and air pressure)
Contact Patch Area
(@ vehicle load, speed and air pressure)
Speedometer Reading
(Tire 1 is assumed accurate)
Tire Suspension Comfort Value

Length Conversion Calculator

Millimeters Inches Centimeters Feet


Area Conversion Calculator

Square Centimeters Square Inches


Speed Conversion Calculator

Km/h MPH


Weight Conversion Calculator

Kilograms Pounds


Pressure Conversion Calculator

Bar kPa Psi


Rate Conversion Calculator

kg/mm N/mm lb/in


Volume Conversion Calculator

Liters Cubic Inches

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