90 is the width in millimetres of the tyres cross section.
- Aspect Ratio100
100 is the Aspect Ratio, it is the ratio of the sidewall height to the cross section width.
Radial construction. R stands for radial-ply construction.
10 inches, stands for the diameter of the wheel that the tyre is designed to fit.
- Load Rating52
52 (200 kg) is the load index i.e. the maximum weight each tyre can carry at full speed.
- Speed RatingP
P (150 kmph) is the speed rating i.e. the maximum speed for the tyre at full load.