Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 36/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 36.03 (915.04) | -4.01 (-101.76) -10% |
| Width inches (mm) | 12.52 (318) | 12.52 (318) | 0 (0) 0% |
| Circum. inches (mm) | 125.76 (3194.37) | 113.18 (2874.68) | -12.59 (-319.69) -10% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 8.01 (203.52) | -2 (-50.88) -20% |
| Revolutions per mile (km) | 503.81 (313.05) | 559.83 (347.86) | 56.03 (34.81) 11.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18 mph (28.97 km/h) |
| 25 mph (40.23 km/h) | 22.5 mph (36.21 km/h) |
| 30 mph (48.28 km/h) | 27 mph (43.45 km/h) |
| 35 mph (56.33 km/h) | 31.5 mph (50.69 km/h) |
| 40 mph (64.37 km/h) | 36 mph (57.93 km/h) |
| 45 mph (72.42 km/h) | 40.5 mph (65.17 km/h) |
| 50 mph (80.47 km/h) | 45 mph (72.41 km/h) |
| 55 mph (88.51 km/h) | 49.5 mph (79.66 km/h) |
| 60 mph (96.56 km/h) | 54 mph (86.9 km/h) |
| 65 mph (104.61 km/h) | 58.49 mph (94.14 km/h) |
| 70 mph (112.65 km/h) | 62.99 mph (101.38 km/h) |
| 75 mph (120.7 km/h) | 67.49 mph (108.62 km/h) |
| 80 mph (128.75 km/h) | 71.99 mph (115.86 km/h) |
| 85 mph (136.79 km/h) | 76.49 mph (123.1 km/h) |
| 90 mph (144.84 km/h) | 80.99 mph (130.35 km/h) |
| 95 mph (152.89 km/h) | 85.49 mph (137.59 km/h) |
| 100 mph (160.93 km/h) | 89.99 mph (144.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1425 | 1655 | 1782 | 1861 | 1946 | 2007 | 2073 | 2152 | 2261 | 2370 | 2492 | 2589 | 2764 | 2958 | 3110 | 3207 | 3262 | 3462 | 3741 | 4347 |
Better Fuel Economy Factory Ratios Increased Power
