Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/45-15 | 185/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.2 (538.5) | 26.56 (674.5) | 5.35 (136) 25.3% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 66.6 (1691.75) | 83.43 (2119) | 16.82 (427.26) 25.3% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 3.28 (83.25) | 0.18 (4.5) 5.7% |
| Revolutions per mile (km) | 951.29 (591.1) | 759.48 (471.92) | -191.81 (-119.18) -20.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.05 mph (40.32 km/h) |
| 25 mph (40.23 km/h) | 31.31 mph (50.39 km/h) |
| 30 mph (48.28 km/h) | 37.58 mph (60.47 km/h) |
| 35 mph (56.33 km/h) | 43.84 mph (70.55 km/h) |
| 40 mph (64.37 km/h) | 50.1 mph (80.63 km/h) |
| 45 mph (72.42 km/h) | 56.36 mph (90.71 km/h) |
| 50 mph (80.47 km/h) | 62.63 mph (100.79 km/h) |
| 55 mph (88.51 km/h) | 68.89 mph (110.87 km/h) |
| 60 mph (96.56 km/h) | 75.15 mph (120.95 km/h) |
| 65 mph (104.61 km/h) | 81.42 mph (131.03 km/h) |
| 70 mph (112.65 km/h) | 87.68 mph (141.11 km/h) |
| 75 mph (120.7 km/h) | 93.94 mph (151.18 km/h) |
| 80 mph (128.75 km/h) | 100.2 mph (161.26 km/h) |
| 85 mph (136.79 km/h) | 106.47 mph (171.34 km/h) |
| 90 mph (144.84 km/h) | 112.73 mph (181.42 km/h) |
| 95 mph (152.89 km/h) | 118.99 mph (191.5 km/h) |
| 100 mph (160.93 km/h) | 125.26 mph (201.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1933 | 2245 | 2418 | 2525 | 2640 | 2722 | 2813 | 2920 | 3068 | 3216 | 3380 | 3512 | 3750 | 4014 | 4219 | 4351 | 4425 | 4696 | 5074 | 5897 |
Better Fuel Economy Factory Ratios Increased Power
