Guide
Load index and speed rating
The service description after the size, e.g. 115T, is the load index (115 = 2,679 lb / 1,215 kg per tire at its maximum pressure) and the speed rating (T = 118 mph). A replacement tire must meet or exceed the load index and speed rating on your vehicle's tire placard.
Load index chart
| Load index | kg | lb |
|---|---|---|
| 80 | 450 | 992 |
| 81 | 462 | 1,019 |
| 82 | 475 | 1,047 |
| 83 | 487 | 1,074 |
| 84 | 500 | 1,102 |
| 85 | 515 | 1,135 |
| 86 | 530 | 1,168 |
| 87 | 545 | 1,201 |
| 88 | 560 | 1,235 |
| 89 | 580 | 1,279 |
| 90 | 600 | 1,323 |
| 91 | 615 | 1,356 |
| 92 | 630 | 1,389 |
| 93 | 650 | 1,433 |
| 94 | 670 | 1,477 |
| 95 | 690 | 1,521 |
| 96 | 710 | 1,565 |
| 97 | 730 | 1,609 |
| 98 | 750 | 1,653 |
| 99 | 775 | 1,709 |
| 100 | 800 | 1,764 |
| 101 | 825 | 1,819 |
| 102 | 850 | 1,874 |
| 103 | 875 | 1,929 |
| 104 | 900 | 1,984 |
| 105 | 925 | 2,039 |
| 106 | 950 | 2,094 |
| 107 | 975 | 2,149 |
| 108 | 1,000 | 2,205 |
| 109 | 1,030 | 2,271 |
| 110 | 1,060 | 2,337 |
| 111 | 1,090 | 2,403 |
| 112 | 1,120 | 2,469 |
| 113 | 1,150 | 2,535 |
| 114 | 1,180 | 2,601 |
| 115 | 1,215 | 2,679 |
| 116 | 1,250 | 2,756 |
| 117 | 1,285 | 2,833 |
| 118 | 1,320 | 2,910 |
| 119 | 1,360 | 3,000 |
| 120 | 1,400 | 3,085 |
| 121 | 1,450 | 3,195 |
| 122 | 1,500 | 3,305 |
| 123 | 1,550 | 3,415 |
| 124 | 1,600 | 3,525 |
| 125 | 1,650 | 3,640 |
| 126 | 1,700 | 3,750 |
| 127 | 1,750 | 3,860 |
| 128 | 1,800 | 3,970 |
| 129 | 1,850 | 4,080 |
Speed rating letters
| Rating | mph | km/h |
|---|---|---|
| L | 75 | 121 |
| 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 |
| W | 168 | 270 |
| Y | 186 | 300 |
More guides
How to read a tire size · Nominal vs actual diameter · The 3% rule · AWD and mismatched tires · Revs per mile chart · Tire size chart
Important: These are calculated (nominal) dimensions, not a fitment recommendation. Real tires of the same size differ by brand and model (makers allow about ±3% of section height), and width changes with the rim it is mounted on. The math can't see wheel width and offset, clearance at full steering lock and suspension travel, load index, speed rating, or what your vehicle maker approves. Before changing size, check your door-jamb placard and owner's manual and ask a tire professional. A replacement tire must meet or exceed the load index and speed rating on the placard.