Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 315/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.68 (728.5) | 0.44 (11.3) 1.6% |
| Width inches (mm) | 12.8 (325) | 12.4 (315) | -0.39 (-10) -3.1% |
| Circum. inches (mm) | 88.71 (2253.15) | 90.1 (2288.65) | 1.4 (35.5) 1.6% |
| Sidewall Height inches (mm) | 5.12 (130) | 4.34 (110.25) | -0.78 (-19.75) -15.2% |
| Revolutions per mile (km) | 714.26 (443.82) | 703.18 (436.94) | -11.08 (-6.88) -1.6% |
315/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.32 mph (32.69 km/h) |
| 25 mph (40.23 km/h) | 25.39 mph (40.87 km/h) |
| 30 mph (48.28 km/h) | 30.47 mph (49.04 km/h) |
| 35 mph (56.33 km/h) | 35.55 mph (57.21 km/h) |
| 40 mph (64.37 km/h) | 40.63 mph (65.39 km/h) |
| 45 mph (72.42 km/h) | 45.71 mph (73.56 km/h) |
| 50 mph (80.47 km/h) | 50.79 mph (81.74 km/h) |
| 55 mph (88.51 km/h) | 55.87 mph (89.91 km/h) |
| 60 mph (96.56 km/h) | 60.95 mph (98.08 km/h) |
| 65 mph (104.61 km/h) | 66.02 mph (106.26 km/h) |
| 70 mph (112.65 km/h) | 71.1 mph (114.43 km/h) |
| 75 mph (120.7 km/h) | 76.18 mph (122.6 km/h) |
| 80 mph (128.75 km/h) | 81.26 mph (130.78 km/h) |
| 85 mph (136.79 km/h) | 86.34 mph (138.95 km/h) |
| 90 mph (144.84 km/h) | 91.42 mph (147.12 km/h) |
| 95 mph (152.89 km/h) | 96.5 mph (155.3 km/h) |
| 100 mph (160.93 km/h) | 101.58 mph (163.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
Better Fuel Economy Factory Ratios Increased Power
