Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/35-17 | 390/40-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.68 (652.3) | 29.28 (743.8) | 3.6 (91.5) 14% |
| Width inches (mm) | 12.4 (315) | 15.35 (390) | 2.95 (75) 23.8% |
| Circum. inches (mm) | 80.68 (2049.26) | 92 (2336.72) | 11.32 (287.46) 14% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 6.14 (156) | 1.8 (45.75) 41.5% |
| Revolutions per mile (km) | 785.33 (487.98) | 688.72 (427.95) | -96.61 (-60.03) -12.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.81 mph (36.7 km/h) |
| 25 mph (40.23 km/h) | 28.51 mph (45.88 km/h) |
| 30 mph (48.28 km/h) | 34.21 mph (55.05 km/h) |
| 35 mph (56.33 km/h) | 39.91 mph (64.23 km/h) |
| 40 mph (64.37 km/h) | 45.61 mph (73.4 km/h) |
| 45 mph (72.42 km/h) | 51.31 mph (82.58 km/h) |
| 50 mph (80.47 km/h) | 57.01 mph (91.75 km/h) |
| 55 mph (88.51 km/h) | 62.72 mph (100.93 km/h) |
| 60 mph (96.56 km/h) | 68.42 mph (110.11 km/h) |
| 65 mph (104.61 km/h) | 74.12 mph (119.28 km/h) |
| 70 mph (112.65 km/h) | 79.82 mph (128.46 km/h) |
| 75 mph (120.7 km/h) | 85.52 mph (137.63 km/h) |
| 80 mph (128.75 km/h) | 91.22 mph (146.81 km/h) |
| 85 mph (136.79 km/h) | 96.92 mph (155.98 km/h) |
| 90 mph (144.84 km/h) | 102.62 mph (165.16 km/h) |
| 95 mph (152.89 km/h) | 108.33 mph (174.33 km/h) |
| 100 mph (160.93 km/h) | 114.03 mph (183.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1753 | 2036 | 2193 | 2290 | 2394 | 2469 | 2551 | 2648 | 2782 | 2916 | 3065 | 3185 | 3401 | 3640 | 3826 | 3945 | 4012 | 4259 | 4602 | 5347 |
Better Fuel Economy Factory Ratios Increased Power
