2.17. "Nominal rim diameter (d)" means the diameter of the rim on which a tyre is designed
to be mounted; 3/
2.18. "Rim" means the support for a tyre-and-tube assembly, or for a tubeless tyre, on which
the tyre beads are seated ; 3/
2.18.1. "Tyre to rim fitment configuration" means the type of rim to which the tyre is designed
to be fitted. In the case of non-standard rims this will be identified by a symbol applied to the tyre."
2.19. "Theoretical rim" means the rim whose width would be equal to X times the nominal
section width of a tyre. The value of X shall be specified by the manufacturer of the tyre;
2.20. "Measuring rim" means the rim on which a tyre is required to be fitted for size
3/ See the explanatory figure in the appendix.