Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-18 | 120/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.09 (637.2) | 26.5 (673.2) | 1.42 (36) 5.6% |
| Width inches (mm) | 3.94 (100) | 4.72 (120) | 0.79 (20) 20% |
| Circum. inches (mm) | 78.81 (2001.82) | 83.26 (2114.92) | 4.45 (113.1) 5.6% |
| Sidewall Height inches (mm) | 3.54 (90) | 4.25 (108) | 0.71 (18) 20% |
| Revolutions per mile (km) | 803.94 (499.54) | 760.95 (472.83) | -42.99 (-26.71) -5.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.13 mph (34.01 km/h) |
| 25 mph (40.23 km/h) | 26.41 mph (42.51 km/h) |
| 30 mph (48.28 km/h) | 31.69 mph (51.01 km/h) |
| 35 mph (56.33 km/h) | 36.98 mph (59.51 km/h) |
| 40 mph (64.37 km/h) | 42.26 mph (68.01 km/h) |
| 45 mph (72.42 km/h) | 47.54 mph (76.51 km/h) |
| 50 mph (80.47 km/h) | 52.82 mph (85.01 km/h) |
| 55 mph (88.51 km/h) | 58.11 mph (93.51 km/h) |
| 60 mph (96.56 km/h) | 63.39 mph (102.02 km/h) |
| 65 mph (104.61 km/h) | 68.67 mph (110.52 km/h) |
| 70 mph (112.65 km/h) | 73.95 mph (119.02 km/h) |
| 75 mph (120.7 km/h) | 79.24 mph (127.52 km/h) |
| 80 mph (128.75 km/h) | 84.52 mph (136.02 km/h) |
| 85 mph (136.79 km/h) | 89.8 mph (144.52 km/h) |
| 90 mph (144.84 km/h) | 95.08 mph (153.02 km/h) |
| 95 mph (152.89 km/h) | 100.37 mph (161.53 km/h) |
| 100 mph (160.93 km/h) | 105.65 mph (170.03 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
