Tyre size decoder
Type the size from the tyre’s sidewall to see what each part means: width, profile, rim size, load index and speed rating, plus the tyre’s overall diameter.
How to read a tyre size
Take 205/55 R16 91V as an example:
- 205 is the width of the tyre in millimetres.
- 55 is the profile: the sidewall height as a percentage of the width.
- R means radial construction, the way almost every car tyre is built.
- 16 is the diameter of the wheel rim in inches.
- 91 is the load index: the most weight one tyre can carry, here 615 kg.
- V is the speed rating: the highest speed the tyre is built for, here 240 km/h.
Fit the sizes, load index and speed rating your car’s maker approves, listed in the owner’s manual or on the label in the driver’s door frame or fuel filler flap.
Speed ratings
| Symbol | km/h | mph |
|---|---|---|
| J | 100 | 62 |
| K | 110 | 68 |
| L | 120 | 75 |
| M | 130 | 81 |
| N | 140 | 87 |
| P | 150 | 94 |
| Q | 160 | 99 |
| R | 170 | 106 |
| S | 180 | 112 |
| T | 190 | 118 |
| U | 200 | 124 |
| H | 210 | 130 |
| V | 240 | 149 |
| W | 270 | 168 |
| Y | 300 | 186 |
ZR in the size, or a rating in brackets such as (Y), means the tyre is rated above the speed shown.
Load index table
| Load index | kg |
|---|---|
| 50 | 190 |
| 51 | 195 |
| 52 | 200 |
| 53 | 206 |
| 54 | 212 |
| 55 | 218 |
| 56 | 224 |
| 57 | 230 |
| 58 | 236 |
| 59 | 243 |
| 60 | 250 |
| 61 | 257 |
| 62 | 265 |
| 63 | 272 |
| 64 | 280 |
| 65 | 290 |
| 66 | 300 |
| 67 | 307 |
| 68 | 315 |
| 69 | 325 |
| 70 | 335 |
| 71 | 345 |
| 72 | 355 |
| 73 | 365 |
| 74 | 375 |
| 75 | 387 |
| 76 | 400 |
| 77 | 412 |
| 78 | 425 |
| 79 | 437 |
| 80 | 450 |
| 81 | 462 |
| 82 | 475 |
| 83 | 487 |
| 84 | 500 |
| 85 | 515 |
| 86 | 530 |
| 87 | 545 |
| 88 | 560 |
| 89 | 580 |
| 90 | 600 |
| 91 | 615 |
| 92 | 630 |
| 93 | 650 |
| 94 | 670 |
| 95 | 690 |
| 96 | 710 |
| 97 | 730 |
| 98 | 750 |
| 99 | 775 |
| 100 | 800 |
| 101 | 825 |
| 102 | 850 |
| 103 | 875 |
| 104 | 900 |
| 105 | 925 |
| 106 | 950 |
| 107 | 975 |
| 108 | 1,000 |
| 109 | 1,030 |
| 110 | 1,060 |
| 111 | 1,090 |
| 112 | 1,120 |
| 113 | 1,150 |
| 114 | 1,180 |
| 115 | 1,215 |
| 116 | 1,250 |
| 117 | 1,285 |
| 118 | 1,320 |
| 119 | 1,360 |
| 120 | 1,400 |
| 121 | 1,450 |
| 122 | 1,500 |
| 123 | 1,550 |
| 124 | 1,600 |
| 125 | 1,650 |
| 126 | 1,700 |
| 127 | 1,750 |
| 128 | 1,800 |
| 129 | 1,850 |
| 130 | 1,900 |