Nexen Roadian HP 255/55 R18 109V

255

255 is the width in millimetres of the tyres cross section.

55

55 is the Aspect Ratio, it is the ratio of the sidewall height to the cross section width.

18

18 inches, stands for the diameter of the wheel that the tyre is designed to fit.

R

Radial construction.R stands for radial-ply construction.

130

130 is the load index i.e. the maximum weight each tyre can carry at full speed.

V

V is the speed rating i.e. the maximum speed for the tyre at full load.