Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 38/15.5-20 | 35/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.99 (965.04) | 35.03 (889.68) | -2.97 (-75.36) -7.8% |
| Width inches (mm) | 15.51 (394) | 12.52 (318) | -2.99 (-76) -19.3% |
| Circum. inches (mm) | 119.36 (3031.76) | 110.04 (2795.01) | -9.32 (-236.75) -7.8% |
| Sidewall Height inches (mm) | 9 (228.52) | 8.51 (216.24) | -0.48 (-12.28) -5.4% |
| Revolutions per mile (km) | 530.83 (329.84) | 575.79 (357.78) | 44.96 (27.94) 8.5% |
35/12.5-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.44 mph (29.67 km/h) |
| 25 mph (40.23 km/h) | 23.05 mph (37.09 km/h) |
| 30 mph (48.28 km/h) | 27.66 mph (44.51 km/h) |
| 35 mph (56.33 km/h) | 32.27 mph (51.93 km/h) |
| 40 mph (64.37 km/h) | 36.88 mph (59.35 km/h) |
| 45 mph (72.42 km/h) | 41.49 mph (66.77 km/h) |
| 50 mph (80.47 km/h) | 46.1 mph (74.18 km/h) |
| 55 mph (88.51 km/h) | 50.71 mph (81.6 km/h) |
| 60 mph (96.56 km/h) | 55.31 mph (89.02 km/h) |
| 65 mph (104.61 km/h) | 59.92 mph (96.44 km/h) |
| 70 mph (112.65 km/h) | 64.53 mph (103.86 km/h) |
| 75 mph (120.7 km/h) | 69.14 mph (111.28 km/h) |
| 80 mph (128.75 km/h) | 73.75 mph (118.69 km/h) |
| 85 mph (136.79 km/h) | 78.36 mph (126.11 km/h) |
| 90 mph (144.84 km/h) | 82.97 mph (133.53 km/h) |
| 95 mph (152.89 km/h) | 87.58 mph (140.95 km/h) |
| 100 mph (160.93 km/h) | 92.19 mph (148.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1465 | 1702 | 1833 | 1914 | 2002 | 2064 | 2132 | 2214 | 2326 | 2438 | 2563 | 2662 | 2843 | 3043 | 3199 | 3298 | 3355 | 3560 | 3847 | 4471 |
Better Fuel Economy Factory Ratios Increased Power
