Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 275/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 35.32 (897.2) | 9.29 (236) 35.7% |
| Width inches (mm) | 4.72 (120) | 10.83 (275) | 6.1 (155) 129.2% |
| Circum. inches (mm) | 81.78 (2077.22) | 110.97 (2818.64) | 29.19 (741.42) 35.7% |
| Sidewall Height inches (mm) | 4.02 (102) | 8.66 (220) | 4.65 (118) 115.7% |
| Revolutions per mile (km) | 774.76 (481.41) | 570.97 (354.78) | -203.79 (-126.63) -26.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.14 mph (43.68 km/h) |
| 25 mph (40.23 km/h) | 33.92 mph (54.59 km/h) |
| 30 mph (48.28 km/h) | 40.71 mph (65.51 km/h) |
| 35 mph (56.33 km/h) | 47.49 mph (76.43 km/h) |
| 40 mph (64.37 km/h) | 54.28 mph (87.35 km/h) |
| 45 mph (72.42 km/h) | 61.06 mph (98.27 km/h) |
| 50 mph (80.47 km/h) | 67.85 mph (109.19 km/h) |
| 55 mph (88.51 km/h) | 74.63 mph (120.11 km/h) |
| 60 mph (96.56 km/h) | 81.42 mph (131.03 km/h) |
| 65 mph (104.61 km/h) | 88.2 mph (141.94 km/h) |
| 70 mph (112.65 km/h) | 94.98 mph (152.86 km/h) |
| 75 mph (120.7 km/h) | 101.77 mph (163.78 km/h) |
| 80 mph (128.75 km/h) | 108.55 mph (174.7 km/h) |
| 85 mph (136.79 km/h) | 115.34 mph (185.62 km/h) |
| 90 mph (144.84 km/h) | 122.12 mph (196.54 km/h) |
| 95 mph (152.89 km/h) | 128.91 mph (207.46 km/h) |
| 100 mph (160.93 km/h) | 135.69 mph (218.38 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1453 | 1688 | 1818 | 1898 | 1985 | 2047 | 2115 | 2195 | 2306 | 2418 | 2541 | 2640 | 2819 | 3017 | 3172 | 3271 | 3326 | 3530 | 3815 | 4433 |
Better Fuel Economy Factory Ratios Increased Power
