Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/70-18 | 340/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.89 (632.2) | 39.42 (1001.2) | 14.53 (369) 58.4% |
| Width inches (mm) | 4.92 (125) | 13.39 (340) | 8.46 (215) 172% |
| Circum. inches (mm) | 78.19 (1986.11) | 123.83 (3145.36) | 45.64 (1159.25) 58.4% |
| Sidewall Height inches (mm) | 3.44 (87.5) | 10.71 (272) | 7.26 (184.5) 210.9% |
| Revolutions per mile (km) | 810.3 (503.49) | 511.66 (317.93) | -298.64 (-185.57) -36.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 31.67 mph (50.97 km/h) |
| 25 mph (40.23 km/h) | 39.59 mph (63.72 km/h) |
| 30 mph (48.28 km/h) | 47.51 mph (76.46 km/h) |
| 35 mph (56.33 km/h) | 55.43 mph (89.2 km/h) |
| 40 mph (64.37 km/h) | 63.35 mph (101.95 km/h) |
| 45 mph (72.42 km/h) | 71.27 mph (114.69 km/h) |
| 50 mph (80.47 km/h) | 79.18 mph (127.43 km/h) |
| 55 mph (88.51 km/h) | 87.1 mph (140.18 km/h) |
| 60 mph (96.56 km/h) | 95.02 mph (152.92 km/h) |
| 65 mph (104.61 km/h) | 102.94 mph (165.66 km/h) |
| 70 mph (112.65 km/h) | 110.86 mph (178.41 km/h) |
| 75 mph (120.7 km/h) | 118.78 mph (191.15 km/h) |
| 80 mph (128.75 km/h) | 126.69 mph (203.89 km/h) |
| 85 mph (136.79 km/h) | 134.61 mph (216.64 km/h) |
| 90 mph (144.84 km/h) | 142.53 mph (229.38 km/h) |
| 95 mph (152.89 km/h) | 150.45 mph (242.13 km/h) |
| 100 mph (160.93 km/h) | 158.37 mph (254.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1302 | 1513 | 1629 | 1701 | 1779 | 1834 | 1895 | 1967 | 2067 | 2166 | 2277 | 2366 | 2527 | 2704 | 2842 | 2931 | 2981 | 3164 | 3419 | 3973 |
Better Fuel Economy Factory Ratios Increased Power
