Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-15 | 315/40-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.98 (609) | 24.92 (633) | 0.94 (24) 3.9% |
| Width inches (mm) | 11.22 (285) | 12.4 (315) | 1.18 (30) 10.5% |
| Circum. inches (mm) | 75.32 (1913.23) | 78.29 (1988.63) | 2.97 (75.4) 3.9% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.96 (126) | 0.47 (12) 10.5% |
| Revolutions per mile (km) | 841.17 (522.68) | 809.27 (502.86) | -31.89 (-19.82) -3.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.79 mph (33.46 km/h) |
| 25 mph (40.23 km/h) | 25.99 mph (41.82 km/h) |
| 30 mph (48.28 km/h) | 31.18 mph (50.18 km/h) |
| 35 mph (56.33 km/h) | 36.38 mph (58.55 km/h) |
| 40 mph (64.37 km/h) | 41.58 mph (66.91 km/h) |
| 45 mph (72.42 km/h) | 46.77 mph (75.27 km/h) |
| 50 mph (80.47 km/h) | 51.97 mph (83.64 km/h) |
| 55 mph (88.51 km/h) | 57.17 mph (92 km/h) |
| 60 mph (96.56 km/h) | 62.36 mph (100.37 km/h) |
| 65 mph (104.61 km/h) | 67.56 mph (108.73 km/h) |
| 70 mph (112.65 km/h) | 72.76 mph (117.09 km/h) |
| 75 mph (120.7 km/h) | 77.96 mph (125.46 km/h) |
| 80 mph (128.75 km/h) | 83.15 mph (133.82 km/h) |
| 85 mph (136.79 km/h) | 88.35 mph (142.19 km/h) |
| 90 mph (144.84 km/h) | 93.55 mph (150.55 km/h) |
| 95 mph (152.89 km/h) | 98.74 mph (158.91 km/h) |
| 100 mph (160.93 km/h) | 103.94 mph (167.28 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2059 | 2392 | 2576 | 2690 | 2813 | 2901 | 2997 | 3111 | 3269 | 3427 | 3602 | 3742 | 3996 | 4277 | 4496 | 4636 | 4715 | 5004 | 5407 | 6284 |
Better Fuel Economy Factory Ratios Increased Power
