Slip Ratio
The slip ratio is similar to slip angle but instead of being measured in angular displacement, it relates the amount of slip a tyre experiences relative to a sliding condition.
Measures longitudinal movement of the tire, and how much grip a tire has lost.
- For example, a slip ratio of 0 is a free rolling tyre
- a ratio of 1 is a tyre that has lost traction
- A general trend seen in tyres is a longitudinal force peak at a slip ratio of around 0.3 – 0.4.