# Tyre Knowledge
Speed Index
(SI)
In this table you can find the speed index and the conversion to mph.
This index stands for the registered maximum speed of the tyre. You can find the speed index on the sidewall of the tyre.
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 |