`C_(rr) = sqrt( z / d )`

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The Rolling Resistance Coefficient for a slow rigid wheel on a perfectly elastic surface, not adjusted for velocity, can be caluclated by `C_(rr)=sqrt(z/d)`, where:

• `z` = sinkage depth
• `d` = diameter of the rigid wheel

References

Wikipedia (https://en.wikipedia.org/wiki/Rolling_resistance)