How to calculate a tyre’s load rating

Outland Group Ltd. / FAQs / How to calculate a tyre’s load rating

Apr 17

How to calculate a tyre’s load rating

April 17, 2020

What is the load rating of my tyre?

The load index of an agricultural tyre can be found on the side of the tyre and is always mentioned together with the speed index. The load index indicates how much weight the tyre is able to cope with (at the correct tyre pressure). Never exceed the load index mentioned on the tyre! The speed index is a code that expresses the maximum speed one can drive with a tyre.

Use the table below to work out the load and speed rating of a tyre.

Load index: This is the maximum load that can be carried at the speed indicated by the speed symbol at nominal pressure.

Speed Symbol: This is the maximum speed at which a tyre can carry a load that matches the load index.

Load	Load	Load	Load	Load	Load	Load	Load		Speed	Speed
Index	Kg	Index	Kg	Index	Kg	Index	Kg		Symbol	KM/h
125	1650	139	2430	153	3650	167	5450		A1	5
126	1700	140	2500	154	3750	168	5600		A2	10
127	1750	141	2575	155	3875	169	5800		A3	15
128	1800	142	2650	156	4000	170	6000		A4	20
129	1850	143	2725	157	4125	171	6150		A5	25
130	1900	144	2800	158	4250	172	6300		A6	30
131	1950	145	2900	159	4375	173	6500		A7	35
132	2000	146	3000	160	4500	174	6700		A8	40
133	2060	147	3075	161	4625	175	6900		B	50
134	2120	148	3150	162	4750	176	7100		C	60
135	2180	149	3250	163	4875	177	7300		D	65
136	2240	150	3350	164	5000	178	7500		E	70
137	2300	151	3450	165	5150	179	7750		F	80
138	2360	152	3550	166	5300	180	8000		G	90

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