Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 90/90-19 | 90/90-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.38 (644.6) | 27.38 (695.4) | 2 (50.8) 7.9% |
| Width inches (mm) | 3.54 (90) | 3.54 (90) | 0 (0) 0% |
| Circum. inches (mm) | 79.73 (2025.07) | 86.01 (2184.66) | 6.28 (159.59) 7.9% |
| Sidewall Height inches (mm) | 3.19 (81) | 3.19 (81) | 0 (0) 0% |
| Revolutions per mile (km) | 794.71 (493.81) | 736.66 (457.74) | -58.05 (-36.07) -7.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.58 mph (34.72 km/h) |
| 25 mph (40.23 km/h) | 26.97 mph (43.4 km/h) |
| 30 mph (48.28 km/h) | 32.36 mph (52.09 km/h) |
| 35 mph (56.33 km/h) | 37.76 mph (60.77 km/h) |
| 40 mph (64.37 km/h) | 43.15 mph (69.45 km/h) |
| 45 mph (72.42 km/h) | 48.55 mph (78.13 km/h) |
| 50 mph (80.47 km/h) | 53.94 mph (86.81 km/h) |
| 55 mph (88.51 km/h) | 59.33 mph (95.49 km/h) |
| 60 mph (96.56 km/h) | 64.73 mph (104.17 km/h) |
| 65 mph (104.61 km/h) | 70.12 mph (112.85 km/h) |
| 70 mph (112.65 km/h) | 75.52 mph (121.53 km/h) |
| 75 mph (120.7 km/h) | 80.91 mph (130.21 km/h) |
| 80 mph (128.75 km/h) | 86.3 mph (138.89 km/h) |
| 85 mph (136.79 km/h) | 91.7 mph (147.58 km/h) |
| 90 mph (144.84 km/h) | 97.09 mph (156.26 km/h) |
| 95 mph (152.89 km/h) | 102.49 mph (164.94 km/h) |
| 100 mph (160.93 km/h) | 107.88 mph (173.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1875 | 2178 | 2345 | 2449 | 2561 | 2640 | 2728 | 2832 | 2976 | 3119 | 3279 | 3406 | 3638 | 3893 | 4092 | 4220 | 4292 | 4555 | 4922 | 5720 |
Better Fuel Economy Factory Ratios Increased Power
