Sizing Systems:
"ZR" Rated Tires
When "ZR" appears in the size designation with the service description,
the maximum speed is as indicated by the service description.
Examples:
| Tire
Designation |
|
Max. Speed |
| P275/40ZR17 93W |
|
270 km/h (168 mph) |
| P275/40ZR17 93Y |
|
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 kh/h (186 mph), a "ZR" must appear in the size
designation. Consult the tire manufacturer for maximum speed when there is
no service description.
Speed
Symbol |
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 |
140 |
87 |
| P |
150 |
94 |
| Q |
160 |
100 |
| R |
170 |
106 |
| S |
180 |
112 |
| T |
190 |
118 |
| U |
200 |
124 |
| H |
210 |
130 |
| V* |
Above 110 |
Above 130 |
| V |
240 |
149 |
| W |
270 |
168 |
| Y |
300 |
186 |
*For unlimited V Tires without Service Description, the speed catagory is
over 210 km/h (130 mph)
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