Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 90/90-18 | 120/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.38 (619.2) | 26.5 (673.2) | 2.13 (54) 8.7% |
| Width inches (mm) | 3.54 (90) | 4.72 (120) | 1.18 (30) 33.3% |
| Circum. inches (mm) | 76.59 (1945.27) | 83.26 (2114.92) | 6.68 (169.65) 8.7% |
| Sidewall Height inches (mm) | 3.19 (81) | 4.25 (108) | 1.06 (27) 33.3% |
| Revolutions per mile (km) | 827.31 (514.07) | 760.95 (472.83) | -66.36 (-41.24) -8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.74 mph (34.99 km/h) |
| 25 mph (40.23 km/h) | 27.18 mph (43.74 km/h) |
| 30 mph (48.28 km/h) | 32.62 mph (52.49 km/h) |
| 35 mph (56.33 km/h) | 38.05 mph (61.24 km/h) |
| 40 mph (64.37 km/h) | 43.49 mph (69.99 km/h) |
| 45 mph (72.42 km/h) | 48.92 mph (78.74 km/h) |
| 50 mph (80.47 km/h) | 54.36 mph (87.48 km/h) |
| 55 mph (88.51 km/h) | 59.8 mph (96.23 km/h) |
| 60 mph (96.56 km/h) | 65.23 mph (104.98 km/h) |
| 65 mph (104.61 km/h) | 70.67 mph (113.73 km/h) |
| 70 mph (112.65 km/h) | 76.1 mph (122.48 km/h) |
| 75 mph (120.7 km/h) | 81.54 mph (131.23 km/h) |
| 80 mph (128.75 km/h) | 86.98 mph (139.98 km/h) |
| 85 mph (136.79 km/h) | 92.41 mph (148.72 km/h) |
| 90 mph (144.84 km/h) | 97.85 mph (157.47 km/h) |
| 95 mph (152.89 km/h) | 103.28 mph (166.22 km/h) |
| 100 mph (160.93 km/h) | 108.72 mph (174.97 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1936 | 2250 | 2423 | 2530 | 2645 | 2728 | 2818 | 2925 | 3074 | 3222 | 3387 | 3519 | 3758 | 4021 | 4227 | 4359 | 4433 | 4705 | 5084 | 5908 |
Better Fuel Economy Factory Ratios Increased Power
