Wednesday, February 9, 2011

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



 

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