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TYRES AND TYRE CARE

What you need to know about tires!

ISO Tire codes

• Date of manufacture

• Maximum inflation pressure

• Traction

• Treadwear

• Maximum load capacity per tyre

• Speed Rating

• Temperature resistance

• Tyre size

 

 

Tread wear  

This number will give you the rate at which the tyre wears out, the higher the treadwear the longer it should take for the tyre to wear out. Hence, a tyre graded at 400 should last twice as long as a tyre graded at 200

Traction  

Traction is a tyre’s ability to stop on wet pavement. A higher graded tyre should allow you to stop your vehicle on a wet road in a shorter distance than a tyre with lower grade. Traction is graded from highest to lowest as ”AA”, “A”, “B” and “C”

Temperature  

The letters will indicate a tyre’s resistance to heat. Tyres are rated from highest to lowest resistance as A, B or C

 

 Tire speed ratings

Code	mph	km/h		Code	mph	km/h
A1	3	5		L	75	120
A2	6	10		M	81	130
A3	9	15		N	87	140
A4	12	20		P	94	150
A5	16	25		Q	100	160
A6	19	30		R	106	170
A7	22	35		S	112	180
A8	25	40		T	118	190
B	31	50		U	124	200
C	37	60		H	130	210
D	40	65		V	149	240
E	43	70		Z	over 149	over 240
F	50	80		W	168	270
G	56	90		(W)	over 168	over 270
J	62	100		Y	186	300
K	68	110		(Y)	over 186	over 300

 

 Tire Load ratings

Standard Load Table (extract from E.T.R.T.O Standards Manual – 2010 page G7 - ref 42psi)
Code	Pounds	Kilograms		Code	Pounds	Kilograms		Code	Pounds	Kilograms		Code	Pounds	Kilograms
60	551	250		80	992	450		100	1,764	800		120	3,087	1,400
61	567	257		81	1,019	462		101	1,819	825		121	3,197	1,450
62	584	265		82	1,047	475		102	1,874	850		122	3,306	1,500
63	600	272		83	1,074	487		103	1,929	875		123	3,418	1,550
64	617	280		84	1,102	500		104	1,984	900		124	3,528	1,600
65	640	290		85	1,135	515		105	2,039	925		125	3,638	1,650
66	661	300		86	1,168	530		106	2,094	950
67	677	307		87	1,201	545		107	2,149	975
68	695	315		88	1,235	560		108	2,205	1,000
69	717	325		89	1,279	580		109	2,271	1,030
70	738	335		90	1,323	600		110	2,337	1,060
71	761	345		91	1,356	615		111	2,403	1,090
72	783	355		92	1,389	630		112	2,470	1,120
73	805	365		93	1,433	650		113	2,536	1,150
74	827	375		94	1,477	670		114	2,601	1,180
75	853	387		95	1,521	690		115	2,679	1,215
76	882	400		96	1,565	710		116	2,756	1,250
77	908	412		97	1,609	730		117	2,833	1,285
78	937	425		98	1,653	750		118	2,910	1,320
79	963	437		99	1,709	775		119	2,999	1,360