Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 32/9.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 31.89 (809.98) | 1.08 (27.48) 3.5% |
| Width inches (mm) | 12.01 (305) | 9.49 (241) | -2.52 (-64) -21% |
| Circum. inches (mm) | 96.78 (2458.3) | 100.18 (2544.63) | 3.4 (86.33) 3.5% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 8.44 (214.49) | 3.04 (77.24) 56.3% |
| Revolutions per mile (km) | 654.66 (406.79) | 632.45 (392.98) | -22.21 (-13.8) -3.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.7 mph (33.32 km/h) |
| 25 mph (40.23 km/h) | 25.88 mph (41.65 km/h) |
| 30 mph (48.28 km/h) | 31.05 mph (49.98 km/h) |
| 35 mph (56.33 km/h) | 36.23 mph (58.31 km/h) |
| 40 mph (64.37 km/h) | 41.4 mph (66.63 km/h) |
| 45 mph (72.42 km/h) | 46.58 mph (74.96 km/h) |
| 50 mph (80.47 km/h) | 51.76 mph (83.29 km/h) |
| 55 mph (88.51 km/h) | 56.93 mph (91.62 km/h) |
| 60 mph (96.56 km/h) | 62.11 mph (99.95 km/h) |
| 65 mph (104.61 km/h) | 67.28 mph (108.28 km/h) |
| 70 mph (112.65 km/h) | 72.46 mph (116.61 km/h) |
| 75 mph (120.7 km/h) | 77.63 mph (124.94 km/h) |
| 80 mph (128.75 km/h) | 82.81 mph (133.27 km/h) |
| 85 mph (136.79 km/h) | 87.99 mph (141.6 km/h) |
| 90 mph (144.84 km/h) | 93.16 mph (149.93 km/h) |
| 95 mph (152.89 km/h) | 98.34 mph (158.26 km/h) |
| 100 mph (160.93 km/h) | 103.51 mph (166.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1609 | 1870 | 2014 | 2103 | 2198 | 2267 | 2342 | 2431 | 2555 | 2678 | 2815 | 2924 | 3123 | 3342 | 3513 | 3623 | 3685 | 3911 | 4226 | 4911 |
Better Fuel Economy Factory Ratios Increased Power
