Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/35-18 | 315/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.51 (698.7) | 25.44 (646.2) | -2.07 (-52.5) -7.5% |
| Width inches (mm) | 13.58 (345) | 12.4 (315) | -1.18 (-30) -8.7% |
| Circum. inches (mm) | 86.42 (2195.03) | 79.93 (2030.1) | -6.49 (-164.93) -7.5% |
| Sidewall Height inches (mm) | 4.75 (120.75) | 3.72 (94.5) | -1.03 (-26.25) -21.7% |
| Revolutions per mile (km) | 733.18 (455.57) | 792.74 (492.59) | 59.57 (37.01) 8.1% |
315/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.5 mph (29.77 km/h) |
| 25 mph (40.23 km/h) | 23.12 mph (37.21 km/h) |
| 30 mph (48.28 km/h) | 27.75 mph (44.65 km/h) |
| 35 mph (56.33 km/h) | 32.37 mph (52.09 km/h) |
| 40 mph (64.37 km/h) | 36.99 mph (59.54 km/h) |
| 45 mph (72.42 km/h) | 41.62 mph (66.98 km/h) |
| 50 mph (80.47 km/h) | 46.24 mph (74.42 km/h) |
| 55 mph (88.51 km/h) | 50.87 mph (81.86 km/h) |
| 60 mph (96.56 km/h) | 55.49 mph (89.31 km/h) |
| 65 mph (104.61 km/h) | 60.12 mph (96.75 km/h) |
| 70 mph (112.65 km/h) | 64.74 mph (104.19 km/h) |
| 75 mph (120.7 km/h) | 69.36 mph (111.63 km/h) |
| 80 mph (128.75 km/h) | 73.99 mph (119.07 km/h) |
| 85 mph (136.79 km/h) | 78.61 mph (126.52 km/h) |
| 90 mph (144.84 km/h) | 83.24 mph (133.96 km/h) |
| 95 mph (152.89 km/h) | 87.86 mph (141.4 km/h) |
| 100 mph (160.93 km/h) | 92.49 mph (148.84 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
