Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/35-15 | 390/45-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.51 (622.5) | 28.82 (732) | 4.31 (109.5) 17.6% |
| Width inches (mm) | 13.58 (345) | 15.35 (390) | 1.77 (45) 13% |
| Circum. inches (mm) | 76.99 (1955.64) | 90.54 (2299.65) | 13.54 (344) 17.6% |
| Sidewall Height inches (mm) | 4.75 (120.75) | 6.91 (175.5) | 2.16 (54.75) 45.3% |
| Revolutions per mile (km) | 822.92 (511.34) | 699.82 (434.85) | -123.1 (-76.49) -15% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.52 mph (37.85 km/h) |
| 25 mph (40.23 km/h) | 29.4 mph (47.31 km/h) |
| 30 mph (48.28 km/h) | 35.28 mph (56.77 km/h) |
| 35 mph (56.33 km/h) | 41.16 mph (66.24 km/h) |
| 40 mph (64.37 km/h) | 47.04 mph (75.7 km/h) |
| 45 mph (72.42 km/h) | 52.92 mph (85.16 km/h) |
| 50 mph (80.47 km/h) | 58.8 mph (94.62 km/h) |
| 55 mph (88.51 km/h) | 64.67 mph (104.08 km/h) |
| 60 mph (96.56 km/h) | 70.55 mph (113.55 km/h) |
| 65 mph (104.61 km/h) | 76.43 mph (123.01 km/h) |
| 70 mph (112.65 km/h) | 82.31 mph (132.47 km/h) |
| 75 mph (120.7 km/h) | 88.19 mph (141.93 km/h) |
| 80 mph (128.75 km/h) | 94.07 mph (151.39 km/h) |
| 85 mph (136.79 km/h) | 99.95 mph (160.86 km/h) |
| 90 mph (144.84 km/h) | 105.83 mph (170.32 km/h) |
| 95 mph (152.89 km/h) | 111.71 mph (179.78 km/h) |
| 100 mph (160.93 km/h) | 117.59 mph (189.24 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1781 | 2069 | 2228 | 2327 | 2433 | 2508 | 2592 | 2690 | 2827 | 2963 | 3115 | 3236 | 3456 | 3698 | 3888 | 4009 | 4077 | 4327 | 4676 | 5434 |
Better Fuel Economy Factory Ratios Increased Power
