Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/35-20 | 315/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.41 (721.5) | 27.44 (697) | -0.96 (-24.5) -3.4% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 89.24 (2266.66) | 86.21 (2189.69) | -3.03 (-76.97) -3.4% |
| Sidewall Height inches (mm) | 4.2 (106.75) | 3.72 (94.5) | -0.48 (-12.25) -11.5% |
| Revolutions per mile (km) | 710.01 (441.18) | 734.96 (456.68) | 24.96 (15.51) 3.5% |
315/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.32 mph (31.09 km/h) |
| 25 mph (40.23 km/h) | 24.15 mph (38.87 km/h) |
| 30 mph (48.28 km/h) | 28.98 mph (46.64 km/h) |
| 35 mph (56.33 km/h) | 33.81 mph (54.41 km/h) |
| 40 mph (64.37 km/h) | 38.64 mph (62.19 km/h) |
| 45 mph (72.42 km/h) | 43.47 mph (69.96 km/h) |
| 50 mph (80.47 km/h) | 48.3 mph (77.73 km/h) |
| 55 mph (88.51 km/h) | 53.13 mph (85.51 km/h) |
| 60 mph (96.56 km/h) | 57.96 mph (93.28 km/h) |
| 65 mph (104.61 km/h) | 62.79 mph (101.06 km/h) |
| 70 mph (112.65 km/h) | 67.62 mph (108.83 km/h) |
| 75 mph (120.7 km/h) | 72.45 mph (116.6 km/h) |
| 80 mph (128.75 km/h) | 77.28 mph (124.38 km/h) |
| 85 mph (136.79 km/h) | 82.11 mph (132.15 km/h) |
| 90 mph (144.84 km/h) | 86.94 mph (139.92 km/h) |
| 95 mph (152.89 km/h) | 91.77 mph (147.7 km/h) |
| 100 mph (160.93 km/h) | 96.6 mph (155.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1870 | 2173 | 2340 | 2443 | 2555 | 2634 | 2722 | 2825 | 2969 | 3112 | 3271 | 3398 | 3629 | 3884 | 4083 | 4210 | 4282 | 4545 | 4911 | 5707 |
Better Fuel Economy Factory Ratios Increased Power
