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 Exercises Wheel change Save Energy History Formulary Formulary Generally Axle Load Distribution Payload Distribution Braking Distance Driving Force Work/Energy Radian Measure Tension (brake) Brake Force Brake Pedal Brake Force (wheel) De-/Acceleration Braking Distance Braking Period CO2 emission Density Torque Pressure Injection Quatity Electrical Power Riding Speed Centrifugal Force Gas Speed Speed Coaxial Gearbox Lever Ratio Hollow Cylinder Stroke-bore Ratio Displacement Power Output p.l. Hydraulic Ratio Capacity Piston Speed Piston Force Force Crank Mechan. Forces Fuel Consumption 1 Fuel Consumption 2 Fuel Consumption 3 Ciruit Area Circuit Ring Circumference Clutch Pedal Power (mechanical) Power (effective) Power (indicated) Efficiency Weight Wire Resistance Steering Ratio Volumetric Efficiency Air Ratio Venturi Air Resistance Parallel Circuit Planetary Gearbox Percent Rectangle Rectangle Column Friction Force Tyre Calculation Serial Circuit Rolling Resistance Cam Dwell Dwell Period Slip Spread of Gears Climbing Resistance Ratio Circumference speed Conversions Not Coaxial Gearbox Valve Opening Area Valve Opening Angle Valve Opening Period Compression Ratio 1 Compression Ratio 2 Amount of Heat Resistance Efficiency Cube Ignition Interval Cylinder

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## Tyre Calculation

The dynamic wheel-radius cannot be determined from the tyre description, indeed, the radius/diameter can. The precision is limited, because in the case of, e.g., the tyre-width, we're dealing with a grid dimension. Regardless of whether the tyre is 209 mm or 201 mm wide, the tyre always has the description '205'.

## WheeldiameterTyre heightRim diameter Top to bottomTyrewidthRatioheight to widthInch -> mm dR=2·b·h/b100+dF·25,4

dR: Tyre diameter in mm, cm, dm, m
b: Tyre width in mm, cm, dm, m
h/b: Ratio from height to width in percent
dF: Rim diameter in inch

## 160/60 ZR 17

b = 160 mm; h/b = 60; dF = 17 Zoll

## 205/65 R 15 86T

b = 205 mm; h/b = 65; dF = 15 Zoll

 Check your calculation!     You need help?Insert numbers only in three of the four fields! 1. Tyre width mm cm dm m 2. Ratio from height/width percent 3. Rim diameter inch 4. Tyre diameter mm cm dm m Places behind comma: 2 3 4 5

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