Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 37/11.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 37.07 (941.64) | -2.96 (-75.16) -7.4% |
| Width inches (mm) | 12.52 (318) | 11.5 (292) | -1.02 (-26) -8.2% |
| Circum. inches (mm) | 125.76 (3194.37) | 116.47 (2958.25) | -9.3 (-236.12) -7.4% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 11.04 (280.32) | 1.02 (25.92) 10.2% |
| Revolutions per mile (km) | 503.81 (313.05) | 544.02 (338.04) | 40.21 (24.99) 8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.52 mph (29.81 km/h) |
| 25 mph (40.23 km/h) | 23.15 mph (37.26 km/h) |
| 30 mph (48.28 km/h) | 27.78 mph (44.71 km/h) |
| 35 mph (56.33 km/h) | 32.41 mph (52.16 km/h) |
| 40 mph (64.37 km/h) | 37.04 mph (59.62 km/h) |
| 45 mph (72.42 km/h) | 41.67 mph (67.07 km/h) |
| 50 mph (80.47 km/h) | 46.3 mph (74.52 km/h) |
| 55 mph (88.51 km/h) | 50.93 mph (81.97 km/h) |
| 60 mph (96.56 km/h) | 55.56 mph (89.42 km/h) |
| 65 mph (104.61 km/h) | 60.2 mph (96.88 km/h) |
| 70 mph (112.65 km/h) | 64.83 mph (104.33 km/h) |
| 75 mph (120.7 km/h) | 69.46 mph (111.78 km/h) |
| 80 mph (128.75 km/h) | 74.09 mph (119.23 km/h) |
| 85 mph (136.79 km/h) | 78.72 mph (126.68 km/h) |
| 90 mph (144.84 km/h) | 83.35 mph (134.13 km/h) |
| 95 mph (152.89 km/h) | 87.98 mph (141.59 km/h) |
| 100 mph (160.93 km/h) | 92.61 mph (149.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1384 | 1608 | 1732 | 1809 | 1891 | 1950 | 2015 | 2091 | 2197 | 2303 | 2421 | 2516 | 2686 | 2875 | 3022 | 3116 | 3169 | 3364 | 3635 | 4224 |
Better Fuel Economy Factory Ratios Increased Power
