The design of a radial tire is shown on the left: 1, 2 - ply breaker frame; 3 - frame (the basis); 4 - side ring; 5 - running surface (tread).
Pressing depth right "b" is the most important rim dimension, the distance between the middle of the rim and the bearing surface near the wheel hub.
Designations 145 SR13, 155 R13 S and 175/70 SR13 are deciphered as follows:
- 145, 155, 175 is the width of the tires in an unloaded state, in mm;
- 70 is the ratio of the height of the tire to its width, if there is no number, then this is the ratio of 80;
- R - radial type of tire carcass;
- 13 - tire inner diameter in inches (");
- Q - permissible maximum speed up to 160 km / h speed class for conventional M + S tires;
- S - maximum speed up to 180 km h;
- T, H and V - speed classes up to 190, 210 and over 210 km / h - are not required for the described models with a maximum speed of 155 km / h.
Here is an explanation of the various symbols found on the tire sidewall: 1 - maximum load; 2 - internal pressure; 3 - characteristics of the breaker; 4 - characteristics of the layers of cord and side wall; 5 - material and number of layers of the tread cord; 6 - compliance with DOT tests; 7 - manufacturer's code; 8 - tire size code; 9 - tire type code (optional, this is an internal company designation); 10 - date of manufacture; 11 - year of issue; 12 - radial tire; 13 - tubeless tire; 14 - nominal width; 15 - ratio of height to width (low profile); 16 - radial tire; 17 - rim diameter (in inches); 18 - load factor; 19 - speed index; 20 - mark on the EEC test (permission mark, country code is indicated, for example, 3 is the code of Italy); 21 - EEC permit number.
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