32.1. Metric tire size code.
1. Tire type:
R - passenger.
T - temporary.
C - commercial (cargo).
2. Width (in mm).
3. The ratio of dimensions (height) / (width) in %.
4. Type of construction:
R - radial.
B - diagonally encircling.
D - diagonal.
5. Disc diameter in inches.
Tire pressure affects tire wear and vehicle handling. Balance the wheel after installing the tire on the rim.