Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/70-18 | 31/10.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.5 (800.2) | 31.03 (788.28) | -0.47 (-11.92) -1.5% |
| Width inches (mm) | 9.65 (245) | 10.51 (267) | 0.87 (22) 9% |
| Circum. inches (mm) | 98.97 (2513.9) | 97.5 (2476.45) | -1.47 (-37.45) -1.5% |
| Sidewall Height inches (mm) | 6.75 (171.5) | 6.52 (165.54) | -0.23 (-5.96) -3.5% |
| Revolutions per mile (km) | 640.18 (397.79) | 649.86 (403.8) | 9.68 (6.02) 1.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.7 mph (31.71 km/h) |
| 25 mph (40.23 km/h) | 24.63 mph (39.63 km/h) |
| 30 mph (48.28 km/h) | 29.55 mph (47.56 km/h) |
| 35 mph (56.33 km/h) | 34.48 mph (55.49 km/h) |
| 40 mph (64.37 km/h) | 39.4 mph (63.41 km/h) |
| 45 mph (72.42 km/h) | 44.33 mph (71.34 km/h) |
| 50 mph (80.47 km/h) | 49.26 mph (79.27 km/h) |
| 55 mph (88.51 km/h) | 54.18 mph (87.2 km/h) |
| 60 mph (96.56 km/h) | 59.11 mph (95.12 km/h) |
| 65 mph (104.61 km/h) | 64.03 mph (103.05 km/h) |
| 70 mph (112.65 km/h) | 68.96 mph (110.98 km/h) |
| 75 mph (120.7 km/h) | 73.88 mph (118.9 km/h) |
| 80 mph (128.75 km/h) | 78.81 mph (126.83 km/h) |
| 85 mph (136.79 km/h) | 83.73 mph (134.76 km/h) |
| 90 mph (144.84 km/h) | 88.66 mph (142.68 km/h) |
| 95 mph (152.89 km/h) | 93.58 mph (150.61 km/h) |
| 100 mph (160.93 km/h) | 98.51 mph (158.54 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1654 | 1921 | 2069 | 2160 | 2259 | 2329 | 2407 | 2498 | 2625 | 2752 | 2892 | 3005 | 3209 | 3434 | 3610 | 3723 | 3786 | 4018 | 4342 | 5046 |
Better Fuel Economy Factory Ratios Increased Power
