Understand the Meaning of Tire Numbering

Understand the Meaning of Tire Numbering

The numbering engraved on the tires of the cars brings some important information to the driver. To avoid risks especially at the time of the exchange, it is good to understand a little what these numbers represent.

José Carlos Quadrelli, general manager of Sales Engineering at Bridgestone Brazil, explains that the inscriptions on the sides of the tire (letter and number combinations) function as the “DNA” of the tire. They indicate, for example, the dimensions, the type of construction, the performance characteristics and even the maximum speed and the load weight of the vehicle.

When changing tires, you should observe the minimum and maximum measures recommended by the automaker. With the help of Quadrelli, we have selected an example of a Bridgestone tire to better understand the information.

Tire B250 Ecopia 165/70 R13 79T:

Bridgestone – name of manufacturer

B250 – trade description of the product

Ecopia – identification of tire type with low rolling resistance

165 – tire width in millimeters

70 – height of the tire section (70% of the nominal tire width)

R – type of construction “Radial”

13 – rim diameter in inches

79 – load index (maximum load of 437 kg)

T – speed symbol (maximum speed 190 km / h)

– Load indexes

70 – 335 kilos
71 – 345 kilos
72 – 355 kilos
73 – 365 kilos
74 – 375 kilos
75 – 387 kilos
76 – 400 kilos
77 – 412 kilos
78 – 425 kilos
79 – 437 kilos
80 – 450 kilos
81 – 462 pounds
82 – 475 pounds
83 – 487 pounds
84 – 500 pounds
85 – 515 pounds
86 – 530 pounds
87 – 545 pounds
88 – 560 pounds
89 – 580 pounds
90 – 600 pounds

– Maximum speed symbols

L – 120 km / h
M – 130 km / h
N – 140 km / h
P – 150 km / h
Q – 160 km / h
R – 170 km / h
S – 180 km / h
T – 190 km / h
U – 200 km / h
H – 210 km / h
V – 240 km / h
W – 270 km / h
Y – 300 km / h

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