Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 355/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 31.18 (792) | 0.37 (9.5) 1.2% |
| Width inches (mm) | 12.01 (305) | 13.98 (355) | 1.97 (50) 16.4% |
| Circum. inches (mm) | 96.78 (2458.3) | 97.96 (2488.14) | 1.18 (29.85) 1.2% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 5.59 (142) | 0.19 (4.75) 3.5% |
| Revolutions per mile (km) | 654.66 (406.79) | 646.81 (401.91) | -7.85 (-4.88) -1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.24 mph (32.58 km/h) |
| 25 mph (40.23 km/h) | 25.3 mph (40.72 km/h) |
| 30 mph (48.28 km/h) | 30.36 mph (48.87 km/h) |
| 35 mph (56.33 km/h) | 35.42 mph (57.01 km/h) |
| 40 mph (64.37 km/h) | 40.49 mph (65.16 km/h) |
| 45 mph (72.42 km/h) | 45.55 mph (73.3 km/h) |
| 50 mph (80.47 km/h) | 50.61 mph (81.44 km/h) |
| 55 mph (88.51 km/h) | 55.67 mph (89.59 km/h) |
| 60 mph (96.56 km/h) | 60.73 mph (97.73 km/h) |
| 65 mph (104.61 km/h) | 65.79 mph (105.88 km/h) |
| 70 mph (112.65 km/h) | 70.85 mph (114.02 km/h) |
| 75 mph (120.7 km/h) | 75.91 mph (122.17 km/h) |
| 80 mph (128.75 km/h) | 80.97 mph (130.31 km/h) |
| 85 mph (136.79 km/h) | 86.03 mph (138.46 km/h) |
| 90 mph (144.84 km/h) | 91.09 mph (146.6 km/h) |
| 95 mph (152.89 km/h) | 96.15 mph (154.74 km/h) |
| 100 mph (160.93 km/h) | 101.21 mph (162.89 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1646 | 1912 | 2059 | 2150 | 2248 | 2318 | 2395 | 2487 | 2613 | 2739 | 2879 | 2991 | 3194 | 3418 | 3593 | 3705 | 3768 | 3999 | 4322 | 5022 |
Better Fuel Economy Factory Ratios Increased Power
