Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-17 | 315/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.66 (651.8) | 25.44 (646.2) | -0.22 (-5.6) -0.9% |
| Width inches (mm) | 10.83 (275) | 12.4 (315) | 1.57 (40) 14.5% |
| Circum. inches (mm) | 80.62 (2047.69) | 79.93 (2030.1) | -0.69 (-17.59) -0.9% |
| Sidewall Height inches (mm) | 4.33 (110) | 3.72 (94.5) | -0.61 (-15.5) -14.1% |
| Revolutions per mile (km) | 785.93 (488.35) | 792.74 (492.59) | 6.81 (4.23) 0.9% |
315/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.83 mph (31.91 km/h) |
| 25 mph (40.23 km/h) | 24.79 mph (39.89 km/h) |
| 30 mph (48.28 km/h) | 29.74 mph (47.87 km/h) |
| 35 mph (56.33 km/h) | 34.7 mph (55.84 km/h) |
| 40 mph (64.37 km/h) | 39.66 mph (63.82 km/h) |
| 45 mph (72.42 km/h) | 44.61 mph (71.8 km/h) |
| 50 mph (80.47 km/h) | 49.57 mph (79.78 km/h) |
| 55 mph (88.51 km/h) | 54.53 mph (87.75 km/h) |
| 60 mph (96.56 km/h) | 59.48 mph (95.73 km/h) |
| 65 mph (104.61 km/h) | 64.44 mph (103.71 km/h) |
| 70 mph (112.65 km/h) | 69.4 mph (111.69 km/h) |
| 75 mph (120.7 km/h) | 74.36 mph (119.66 km/h) |
| 80 mph (128.75 km/h) | 79.31 mph (127.64 km/h) |
| 85 mph (136.79 km/h) | 84.27 mph (135.62 km/h) |
| 90 mph (144.84 km/h) | 89.23 mph (143.6 km/h) |
| 95 mph (152.89 km/h) | 94.18 mph (151.57 km/h) |
| 100 mph (160.93 km/h) | 99.14 mph (159.55 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
