Pirelli P ZERO-245/45 R20 103Y Tubeless

245

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

45

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

R

Radial construction.R stands for radial-ply construction.

20

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

Y

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