The exact dimensions of a tyre can be found on the sidewall printed mark. The graphic shows how to read properties and dimensions of the tyre:
Stock Level
available
Type of Tyre
Winter tyres
M+S marking
with snow flake symbol
Winter tires
with snowflake symbol
Speed Index
T:Approved up to
190 mph
Ply Rate
4,
1. Overall tire width in mm 2. Ratio of tire height to tire width in% 3. Tire design: 'R' = radial tires (widely used), 'D' or '-' = diagonal tires (rare) 4. Required rim diameter for this tire in inches 5. Key figure for tire load capacity 6. Key figure for the permissible maximum speed (speed index) 7. Motorcycle tire identification, tires only approved for motorcycles 8. DOT labeling 9. Date of manufacture of the tire (week of production / year of production)
PR is an abbreviation of "ply rating". This label originally indicated the number of layers of cotton fishing line in the shell. A large number of bearings means a higher load capacity. When stronger materials were introduced for bearings, this term was removed from the actual number of bearings. Currently, a tire with 8 PR can only have four nylon linear bearings. Today, the stability of a controlled tire is expressed in terms of load capacity and speed capacity, and not in terms of the ply rating.
The Winguard Winspike 3 tyres are molded to allow for stud installation that provides better traction on ice and snow. It was developed for the drivers of sedans, crossovers, and SUVs looking for sure-footed performance and traditional wintertime traction on dry, wet, and snow-covered roads.