Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-19 | 315/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.2 (640.1) | 25.44 (646.2) | 0.24 (6.1) 1% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 79.17 (2010.93) | 79.93 (2030.1) | 0.75 (19.16) 1% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 3.72 (94.5) | 0.62 (15.75) 20% |
| Revolutions per mile (km) | 800.3 (497.28) | 792.74 (492.59) | -7.55 (-4.69) -0.9% |
315/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.19 mph (32.49 km/h) |
| 25 mph (40.23 km/h) | 25.24 mph (40.62 km/h) |
| 30 mph (48.28 km/h) | 30.29 mph (48.74 km/h) |
| 35 mph (56.33 km/h) | 35.33 mph (56.86 km/h) |
| 40 mph (64.37 km/h) | 40.38 mph (64.99 km/h) |
| 45 mph (72.42 km/h) | 45.43 mph (73.11 km/h) |
| 50 mph (80.47 km/h) | 50.48 mph (81.23 km/h) |
| 55 mph (88.51 km/h) | 55.52 mph (89.36 km/h) |
| 60 mph (96.56 km/h) | 60.57 mph (97.48 km/h) |
| 65 mph (104.61 km/h) | 65.62 mph (105.6 km/h) |
| 70 mph (112.65 km/h) | 70.67 mph (113.73 km/h) |
| 75 mph (120.7 km/h) | 75.71 mph (121.85 km/h) |
| 80 mph (128.75 km/h) | 80.76 mph (129.97 km/h) |
| 85 mph (136.79 km/h) | 85.81 mph (138.1 km/h) |
| 90 mph (144.84 km/h) | 90.86 mph (146.22 km/h) |
| 95 mph (152.89 km/h) | 95.91 mph (154.34 km/h) |
| 100 mph (160.93 km/h) | 100.95 mph (162.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017 | 2344 | 2524 | 2635 | 2756 | 2841 | 2936 | 3048 | 3202 | 3357 | 3528 | 3666 | 3915 | 4189 | 4404 | 4541 | 4619 | 4902 | 5297 | 6155 |
Better Fuel Economy Factory Ratios Increased Power
