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# Tire Knowledge
Speed Index
(SI)
In this table you can find the speed index and the conversation to mph.
This index stands for the registered maximum speed of the tire. You can find the speed index on the sidewall of the tire.
Example:
150/70 R 17 M/C 69 V TL
| Speed Symbol | Speed (mph) | Speed (km/h) |
| B | 31 | 50 |
| J | 62 | 100 |
| K | 68 | 110 |
| L | 75 | 120 |
| M | 81 | 130 |
| N | 87 | 140 |
| P | 93 | 150 |
| Q | 99 | 160 |
| R | 106 | 170 |
| S | 112 | 180 |
| T | 118 | 190 |
| U | 124 | 200 |
| H | 130 | 210 |
| V | 149 | 240 |
| Z | > 150 | > 240 |
| W | 168 | 270 |
| (W) | > 168 | > 270 |