Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 35/14.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 35.07 (890.72) | -4.96 (-126.08) -12.4% |
| Width inches (mm) | 12.52 (318) | 14.49 (368) | 1.97 (50) 15.7% |
| Circum. inches (mm) | 125.76 (3194.37) | 110.17 (2798.28) | -15.59 (-396.09) -12.4% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 7.53 (191.36) | -2.48 (-63.04) -24.8% |
| Revolutions per mile (km) | 503.81 (313.05) | 575.12 (357.36) | 71.31 (44.31) 14.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.52 mph (28.2 km/h) |
| 25 mph (40.23 km/h) | 21.9 mph (35.24 km/h) |
| 30 mph (48.28 km/h) | 26.28 mph (42.29 km/h) |
| 35 mph (56.33 km/h) | 30.66 mph (49.34 km/h) |
| 40 mph (64.37 km/h) | 35.04 mph (56.39 km/h) |
| 45 mph (72.42 km/h) | 39.42 mph (63.44 km/h) |
| 50 mph (80.47 km/h) | 43.8 mph (70.49 km/h) |
| 55 mph (88.51 km/h) | 48.18 mph (77.54 km/h) |
| 60 mph (96.56 km/h) | 52.56 mph (84.59 km/h) |
| 65 mph (104.61 km/h) | 56.94 mph (91.64 km/h) |
| 70 mph (112.65 km/h) | 61.32 mph (98.69 km/h) |
| 75 mph (120.7 km/h) | 65.7 mph (105.73 km/h) |
| 80 mph (128.75 km/h) | 70.08 mph (112.78 km/h) |
| 85 mph (136.79 km/h) | 74.46 mph (119.83 km/h) |
| 90 mph (144.84 km/h) | 78.84 mph (126.88 km/h) |
| 95 mph (152.89 km/h) | 83.22 mph (133.93 km/h) |
| 100 mph (160.93 km/h) | 87.6 mph (140.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1464 | 1700 | 1831 | 1912 | 1999 | 2061 | 2130 | 2211 | 2323 | 2435 | 2560 | 2659 | 2840 | 3039 | 3195 | 3295 | 3351 | 3556 | 3843 | 4465 |
Better Fuel Economy Factory Ratios Increased Power
