Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 315/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 28.68 (728.5) | -0.93 (-23.5) -3.1% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 93.01 (2362.48) | 90.1 (2288.65) | -2.91 (-73.83) -3.1% |
| Sidewall Height inches (mm) | 4.8 (122) | 4.34 (110.25) | -0.46 (-11.75) -9.6% |
| Revolutions per mile (km) | 681.21 (423.28) | 703.18 (436.94) | 21.97 (13.65) 3.2% |
315/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.38 mph (31.18 km/h) |
| 25 mph (40.23 km/h) | 24.22 mph (38.98 km/h) |
| 30 mph (48.28 km/h) | 29.06 mph (46.77 km/h) |
| 35 mph (56.33 km/h) | 33.91 mph (54.57 km/h) |
| 40 mph (64.37 km/h) | 38.75 mph (62.36 km/h) |
| 45 mph (72.42 km/h) | 43.59 mph (70.16 km/h) |
| 50 mph (80.47 km/h) | 48.44 mph (77.95 km/h) |
| 55 mph (88.51 km/h) | 53.28 mph (85.75 km/h) |
| 60 mph (96.56 km/h) | 58.13 mph (93.54 km/h) |
| 65 mph (104.61 km/h) | 62.97 mph (101.34 km/h) |
| 70 mph (112.65 km/h) | 67.81 mph (109.13 km/h) |
| 75 mph (120.7 km/h) | 72.66 mph (116.93 km/h) |
| 80 mph (128.75 km/h) | 77.5 mph (124.72 km/h) |
| 85 mph (136.79 km/h) | 82.34 mph (132.52 km/h) |
| 90 mph (144.84 km/h) | 87.19 mph (140.31 km/h) |
| 95 mph (152.89 km/h) | 92.03 mph (148.11 km/h) |
| 100 mph (160.93 km/h) | 96.88 mph (155.91 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
