Decoding Tire Size Etar underline

So you've made it to here... we're guessing you need a little help decoding your tyre size. Never fear we're here to help, the below information will shed some light and get you on your way!

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1
Tyre Width

The tyre width is measured from end to end of the tyre including the sidewall but excluding raised lettering or rim protectors.

Safety Tip: Tyre width affects performance and fuel economy.

2
Section Height

35% is the aspect ratio, representing the height of the tyre's sidewall as a percentage of its width.

Safety Tip: Check tyre pressure regularly to avoid low-pressure issues.

3
Rim Diameter

The inner diameter of your tyre's rim. For example, R19 indicates 19 inches.

Safety Tip: Use the correct size for optimal performance.

4
Load Index

The load index indicates the maximum weight in kg your tyre can safely support.

Safety Tip: Avoid exceeding this weight to prevent steering instability.

5
Speed Index

The speed index shows the maximum speed for the tyre at full load.

Safety Tip: Ensure the tyre's speed rating matches your needs.

6
Week & Year

The manufacturing date helps determine tyre age. For example, 5118 means the 51st week of 2018.

Safety Tip: Avoid aged rubber to ensure tyre safety.

Tyre load index table underline

Load Index Pounds Kilograms
Load Index Pounds Kilograms
Load Index Pounds Kilograms
70 739 335 89 1,279 580 108 2,205 1,000
71 761 345 90 1,323 600 109 2,271 1,030
72 783 355 91 1,356 615 110 2,337 1,060
73 805 365 92 1,389 630 111 2,403 1,090
74 827 375 93 1,433 650 112 2,469 1,120
75 853 387 94 1,477 670 113 2,535 1,150
76 882 400 95 1,521 690 114 2,601 1,180
77 908 412 96 1,565 710 115 2,679 1,215
78 937 425 97 1,609 730 116 2,756 1,250
79 963 437 98 1,653 750 117 2,833 1,285
80 992 450 99 1,709 775 118 2,910 1,320
81 1,019 462 100 1,764 800 119 2,998 1,360
82 1,047 475 101 1,819 825 120 3,086 1,400
83 1,074 487 102 1,874 850 121 3,197 1,450
84 1,102 500 103 1,929 875 122 3,307 1,500
85 1,135 515 104 1,984 900 123 3,417 1,550
86 1,168 530 105 2,039 925 124 3,527 1,600
87 1,201 545 106 2,094 950 125 3,638 1,650
88 1,235 560 107 2,149 975 126 3,748 1,700

Tyre speed index table underline

Speed Code Speed (mph) Speed (k/ph) Category
L 75 mph 120 km/h Off-Road & Light Truck Tires
M 81 mph 130 km/h Temporary Spare Tires
N 87 mph 140km/h
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars
W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars
ZR 149 mph 240 km/h Exotic Sports Cars
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