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 Contents Effective Rolling Radius and Longitudinal wheel Speed Quiz : what happens in the effective radius in braking and acceleration If any change in radius, it it longer or shorter in braking Tyre longitudinal slip in acceleration Tyre longitudinal slip in braking Conclusion Effective Rolling Radius and Wheel Speed When a car stops, tire is loaded vertically by its weight. At that time, vertical wheel radius to the road surface is R L and unloaded circumferential radius is R u . When a car starts on straight and level road, the longitudinal speed of wheel center Vx is neither ωR L nor ωR U . Real longitudinal speed of tire center will be somewhere between ωR L and ωRu. You can get the effective rolling radius if you count the number of wheel turns and measure the distance at a given constant speed. The effective rolling radius can be described as the ratio of  the vehicle speed to the angular velocity of wheel as shown in the equation above. Effective Radius Re can be e...

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