Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/35-18 | 315/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.41 (670.7) | 25.44 (646.2) | -0.96 (-24.5) -3.7% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 82.96 (2107.07) | 79.93 (2030.1) | -3.03 (-76.97) -3.7% |
| Sidewall Height inches (mm) | 4.2 (106.75) | 3.72 (94.5) | -0.48 (-12.25) -11.5% |
| Revolutions per mile (km) | 763.78 (474.59) | 792.74 (492.59) | 28.96 (17.99) 3.8% |
315/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.27 mph (31.01 km/h) |
| 25 mph (40.23 km/h) | 24.09 mph (38.76 km/h) |
| 30 mph (48.28 km/h) | 28.9 mph (46.52 km/h) |
| 35 mph (56.33 km/h) | 33.72 mph (54.27 km/h) |
| 40 mph (64.37 km/h) | 38.54 mph (62.02 km/h) |
| 45 mph (72.42 km/h) | 43.36 mph (69.78 km/h) |
| 50 mph (80.47 km/h) | 48.17 mph (77.53 km/h) |
| 55 mph (88.51 km/h) | 52.99 mph (85.28 km/h) |
| 60 mph (96.56 km/h) | 57.81 mph (93.03 km/h) |
| 65 mph (104.61 km/h) | 62.63 mph (100.79 km/h) |
| 70 mph (112.65 km/h) | 67.44 mph (108.54 km/h) |
| 75 mph (120.7 km/h) | 72.26 mph (116.29 km/h) |
| 80 mph (128.75 km/h) | 77.08 mph (124.04 km/h) |
| 85 mph (136.79 km/h) | 81.9 mph (131.8 km/h) |
| 90 mph (144.84 km/h) | 86.71 mph (139.55 km/h) |
| 95 mph (152.89 km/h) | 91.53 mph (147.3 km/h) |
| 100 mph (160.93 km/h) | 96.35 mph (155.06 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
