Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/90-18 | 120/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 25.56 (649.2) | -0.94 (-24) -3.6% |
| Width inches (mm) | 4.72 (120) | 4.72 (120) | 0 (0) 0% |
| Circum. inches (mm) | 83.26 (2114.92) | 80.3 (2039.52) | -2.97 (-75.4) -3.6% |
| Sidewall Height inches (mm) | 4.25 (108) | 3.78 (96) | -0.47 (-12) -11.1% |
| Revolutions per mile (km) | 760.95 (472.83) | 789.08 (490.31) | 28.13 (17.48) 3.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.29 mph (31.04 km/h) |
| 25 mph (40.23 km/h) | 24.11 mph (38.8 km/h) |
| 30 mph (48.28 km/h) | 28.93 mph (46.56 km/h) |
| 35 mph (56.33 km/h) | 33.75 mph (54.32 km/h) |
| 40 mph (64.37 km/h) | 38.57 mph (62.08 km/h) |
| 45 mph (72.42 km/h) | 43.4 mph (69.84 km/h) |
| 50 mph (80.47 km/h) | 48.22 mph (77.6 km/h) |
| 55 mph (88.51 km/h) | 53.04 mph (85.36 km/h) |
| 60 mph (96.56 km/h) | 57.86 mph (93.12 km/h) |
| 65 mph (104.61 km/h) | 62.68 mph (100.88 km/h) |
| 70 mph (112.65 km/h) | 67.5 mph (108.64 km/h) |
| 75 mph (120.7 km/h) | 72.33 mph (116.4 km/h) |
| 80 mph (128.75 km/h) | 77.15 mph (124.16 km/h) |
| 85 mph (136.79 km/h) | 81.97 mph (131.92 km/h) |
| 90 mph (144.84 km/h) | 86.79 mph (139.68 km/h) |
| 95 mph (152.89 km/h) | 91.61 mph (147.44 km/h) |
| 100 mph (160.93 km/h) | 96.43 mph (155.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2008 | 2333 | 2512 | 2623 | 2743 | 2828 | 2922 | 3033 | 3187 | 3341 | 3512 | 3649 | 3896 | 4170 | 4384 | 4520 | 4597 | 4879 | 5272 | 6127 |
Better Fuel Economy Factory Ratios Increased Power
