Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 90/90-21 | 90/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.38 (695.4) | 28.09 (713.4) | 0.71 (18) 2.6% |
| Width inches (mm) | 3.54 (90) | 3.54 (90) | 0 (0) 0% |
| Circum. inches (mm) | 86.01 (2184.66) | 88.24 (2241.21) | 2.23 (56.55) 2.6% |
| Sidewall Height inches (mm) | 3.19 (81) | 3.54 (90) | 0.35 (9) 11.1% |
| Revolutions per mile (km) | 736.66 (457.74) | 718.07 (446.19) | -18.59 (-11.55) -2.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.52 mph (33.02 km/h) |
| 25 mph (40.23 km/h) | 25.65 mph (41.28 km/h) |
| 30 mph (48.28 km/h) | 30.78 mph (49.53 km/h) |
| 35 mph (56.33 km/h) | 35.91 mph (57.79 km/h) |
| 40 mph (64.37 km/h) | 41.04 mph (66.04 km/h) |
| 45 mph (72.42 km/h) | 46.16 mph (74.3 km/h) |
| 50 mph (80.47 km/h) | 51.29 mph (82.55 km/h) |
| 55 mph (88.51 km/h) | 56.42 mph (90.81 km/h) |
| 60 mph (96.56 km/h) | 61.55 mph (99.06 km/h) |
| 65 mph (104.61 km/h) | 66.68 mph (107.32 km/h) |
| 70 mph (112.65 km/h) | 71.81 mph (115.57 km/h) |
| 75 mph (120.7 km/h) | 76.94 mph (123.83 km/h) |
| 80 mph (128.75 km/h) | 82.07 mph (132.08 km/h) |
| 85 mph (136.79 km/h) | 87.2 mph (140.34 km/h) |
| 90 mph (144.84 km/h) | 92.33 mph (148.59 km/h) |
| 95 mph (152.89 km/h) | 97.46 mph (156.85 km/h) |
| 100 mph (160.93 km/h) | 102.59 mph (165.1 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1827 | 2123 | 2286 | 2387 | 2496 | 2574 | 2659 | 2760 | 2900 | 3040 | 3196 | 3320 | 3546 | 3795 | 3989 | 4113 | 4183 | 4440 | 4798 | 5575 |
Better Fuel Economy Factory Ratios Increased Power
