Tyre Load Index

  • Author: OPONEO.CO.UK

Today we focus on the tyre load index – what it is and why it is important? This article will present key information about the tyre load capacity and risks resulting from using improperly selected tyres.

Tyre load index

The tyre load index defines the maximum load of a tyre moving at the maximum permissible speed. The load index is expressed by a two or three-digit number and is located on the tyre sidewall. The manufacturer sets the maximum load capacity of the tyre, taking into account the most loaded axle of a vehicle.

tyre-load-index

The load capacity is extremely important for the safety of the car user and it is always considered together with tyre speed index.

Tyre load index vs. total car weight

By knowing the maximum load for one tyre, we can easily calculate the maximum total weight of our vehicle.

If the tyre load index is 91T, it means that the load on the tyre shall not exceed 615 kg.

If you multiply the number of kilograms acting on one tyre by the number of tyres in your vehicle, you will get a value slightly higher than the total maximum weight of the vehicle.

If you plan to choose replacement tyres in a different size than those recommended by the manufacturer, you should choose tyres with a load index specified in the manual of your car.  

Do not install tyres with a lower load index than recommended by the manufacturer.

How to get proper size and load index of replacement tyres

In a nutshell, the following example will give you practical hints on how you should match a tyre size and load index to find the best alternative for your vehicle:

  • If you have tyres with the size of  205/55 R16 91T and you plan to install narrower tyres, e.g., for the winter, the replacement tyres would be 16" tyres (195/60 89 H).

  • Unfortunately, the load index of selected tyres is lower than the one suitable for your vehicle, so you cannot install them.

  • A good alternative is 15-inch tyre (195/65 R15) with load index of 91T. In this case you need 15-inch wheels and the possibility of using such wheels.

When buying new tyres for your car, you want them to be safe, economic and comfortable. All these features are achievable, provided that you know the parameters important for tyre selection.

You should also refer to the manual of your car, which provides a detailed description of tyres recommended by the manufacturer. Such information should be also present on the fuel filler flap, on the pillar behind the driver or on the inside of the driver's door. 

Winter tyre tread.

Winter tyre tread.

What may be the consequences of using tyres with an improper load index?

Using tyres with a load index lower than that specified by the manufacturer is always dangerous. Below we present a few reasons why you should observe the guidelines of the manual.

  • Faster tyre wear. Tyres with the wrong load index may wear faster, increasing your car maintenance costs.

  • Risks when driving. Too much load on a tyre may cause it to blow, resulting in an accident.

  • Loss of driving stability and reduced comfort.

  • After a collision or traffic incident, the insurer may refuse to pay the insurance if the car was fitted with tyres not recommended by the manufacturer.

  • When installing tyres with parameters non-compliant with specifications defined by the manufacturer, the tyre guarantee is void.

  • A police officer on a routine check may issue a fine if your tyres do not meet the manufacturer's requirements.

Modern safety systems installed in cars, such as traction control or ABS, are closely linked with the type of tyres recommended by the manufacturer. Fitting tyres that do not meet these requirements causes many problems and the risk of losing basic safety while driving.

Using higher load and speed indices

It is possible to mount tyres with higher load index and speed index than those provided by the manufacturer. However, is it worth using tyres with higher indices?

Advantages of using tyres with a higher load index: Disadvantages of using tyres with a higher load index:
Increased stability of the car while driving against the wind Higher price
Driving is more precise, and the car responds better to the movements of the steering wheel "Stiffening of the vehicle" - reduces travel comfort
Reliable control during a sporty drive Higher rolling resistance, causing increased fuel consumption 
Better cornering Tyres with a load index other than recommended change the driving properties of the vehicle
 

Remember that using tyres with a lower index is dangerous and, as such, it is prohibited and punishable by law. Make sure that you and other road users are safe. Read the information necessary for selecting correct tyres. 

Tyre Load Index (marked on the tyre) Load capacity in kilograms
60 250
61 257
62 265
63 272
64 280
65 290
66 300
67 307
68 315
69 320
Tyre Load Index (marked on the tyre) Load capacity in kilograms
70 335
71 345
72 355
73 365
74 375
75 385
76 400
77 412
78 425
79 437
Tyre Load Index (marked on the tyre) Load capacity in kilograms
80 450
81 462
82 475
83 487
84 500
85 515
86 530
87 545
88 560
89 580
Tyre Load Index (marked on the tyre) Load capacity in kilograms
90 600
91 615
92 630
93 650
94 670
95 690
96 710
97 730
98 750
99 775
Tyre Load Index (marked on the tyre) Load capacity in kilograms
100 800
101 825
102 850
103 875
104 900
105 925
106 950
107 975
108 1000
109 1030
Tyre Load Index (marked on the tyre) Load capacity in kilograms
110 1060
111 1090
112 1120
113 1150
114 1180
115 1215
116 1250
117 1285
118 1320
119 1360
Tyre Load Index (marked on the tyre) Load capacity in kilograms
120 1400
121 1450
122 1500
123 1550
124 1600
125 1650
126 1700
127 1750
128 1800
129 1850
Tyre Load Index (marked on the tyre) Load capacity in kilograms
130 1900
131 1950
132 2000
133 2060
134 2120
135 2180
136 2180
137 2240
138 2360
139 2430
Tyre Load Index (marked on the tyre) Load capacity in kilograms
140 2500
141 2575
142 2650
143 2725
144 2800
145 2900
146 3000
147 3075
148 3159
149 3250
Tyre Load Index (marked on the tyre) Load capacity in kilograms
150 3350
151 3450
152 3550
153 3650
154 3750
155 3875
156 4000
157 4125
158 4250
159 4375
Tyre Load Index (marked on the tyre) Load capacity in kilograms
160 4500
161 4625
162 4750
163 4857
164 5000
165 5150
166 5300
167 5450
168 5600
169 5800
170 6000
You fancy the article? Like us.

Thank you
Add a comment
I accept Privacy policy nowe okno
(Attention: Comments on the forum are moderated)