The contact pressure PC, tyre pressure P, and rigidity factor R are related by
1
\(\frac{{\rm{P}}}{{{{\rm{P}}_{\rm{C}}}}} = {\rm{R}}\)
2
\(\frac{{{{\rm{P}}_{\rm{C}}}}}{{\rm{P}}} = {\rm{R}}\)
3
P × PC = R
4
\({\rm{R}} = {\rm{\;}}\sqrt {\left( {{\rm{P}} \times {{\rm{P}}_{\rm{C}}}} \right)} \)