Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/35-20 | 315/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.5) | 27.92 (709.2) | -0.76 (-19.3) -2.6% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 90.1 (2288.65) | 87.72 (2228.02) | -2.39 (-60.63) -2.6% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 4.96 (126) | 0.62 (15.75) 14.3% |
| Revolutions per mile (km) | 703.18 (436.94) | 722.32 (448.83) | 19.14 (11.89) 2.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.47 mph (31.33 km/h) |
| 25 mph (40.23 km/h) | 24.34 mph (39.17 km/h) |
| 30 mph (48.28 km/h) | 29.21 mph (47 km/h) |
| 35 mph (56.33 km/h) | 34.07 mph (54.83 km/h) |
| 40 mph (64.37 km/h) | 38.94 mph (62.67 km/h) |
| 45 mph (72.42 km/h) | 43.81 mph (70.5 km/h) |
| 50 mph (80.47 km/h) | 48.68 mph (78.34 km/h) |
| 55 mph (88.51 km/h) | 53.54 mph (86.17 km/h) |
| 60 mph (96.56 km/h) | 58.41 mph (94 km/h) |
| 65 mph (104.61 km/h) | 63.28 mph (101.84 km/h) |
| 70 mph (112.65 km/h) | 68.15 mph (109.67 km/h) |
| 75 mph (120.7 km/h) | 73.01 mph (117.5 km/h) |
| 80 mph (128.75 km/h) | 77.88 mph (125.34 km/h) |
| 85 mph (136.79 km/h) | 82.75 mph (133.17 km/h) |
| 90 mph (144.84 km/h) | 87.62 mph (141 km/h) |
| 95 mph (152.89 km/h) | 92.48 mph (148.84 km/h) |
| 100 mph (160.93 km/h) | 97.35 mph (156.67 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1838 | 2135 | 2300 | 2401 | 2511 | 2589 | 2675 | 2777 | 2918 | 3058 | 3215 | 3340 | 3567 | 3817 | 4013 | 4138 | 4208 | 4466 | 4826 | 5608 |
Better Fuel Economy Factory Ratios Increased Power
