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Tire Ratings

According to Hondo 03ST:

When "ZR" appears in the size designation with the service description, the maximum speed is as indicated by the service description.

Tire Designation Maximum Speed
120/70ZR18 59W 270 km/h (168 mph)
120/70ZR18 59Y 300 km/h (186 mph)

For tires having a maximum speed capability above 240 km/h (149 mph), a "ZR" may appear in the size designation. For tires having a maximum speed capability above 300 km/h (186 mph), a "ZR" must appear in the size designation. The actual speed rating is specifically identified by the alpha character on the end (in the example above it's the "W" or the "Y". See the chart below to decode. Of course the tire manufacturers data should be checked to see what the tires actual rated max speed is.

Full List of Speed Ratings

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

Source: http://groups.msn.com/st1300us/general.msnw?action=get_message&mview=0&ID_Message=67125

Partial List of Load Ratings

Index Weight (lbs)
54 467
55 481
56 494
57 507
58 520
59 536
60 551
61 567
62 584
63 600
64 617
65 639
66 661
67 677
68 694
69 716
70 736
71 761
72 783
72 783
73 805
74 827
75 853
76 882
77 908
78 937
79 963
80 992

Source: http://www.st-owners.com/forums/showpost.php?p=857274&postcount=2

-- MarkFeit - 19 Jul 2005
Topic revision: r3 - 01 Nov 2009, MarkFeit
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