Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 175/90-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 32.4 (823) | 2 (50.8) 6.6% |
| Width inches (mm) | 6.89 (175) | 6.89 (175) | 0 (0) 0% |
| Circum. inches (mm) | 95.51 (2425.94) | 101.79 (2585.53) | 6.28 (159.59) 6.6% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 6.2 (157.5) | 0 (0) 0% |
| Revolutions per mile (km) | 663.39 (412.21) | 622.44 (386.77) | -40.95 (-25.44) -6.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.32 mph (34.3 km/h) |
| 25 mph (40.23 km/h) | 26.64 mph (42.88 km/h) |
| 30 mph (48.28 km/h) | 31.97 mph (51.46 km/h) |
| 35 mph (56.33 km/h) | 37.3 mph (60.03 km/h) |
| 40 mph (64.37 km/h) | 42.63 mph (68.61 km/h) |
| 45 mph (72.42 km/h) | 47.96 mph (77.18 km/h) |
| 50 mph (80.47 km/h) | 53.29 mph (85.76 km/h) |
| 55 mph (88.51 km/h) | 58.62 mph (94.34 km/h) |
| 60 mph (96.56 km/h) | 63.95 mph (102.91 km/h) |
| 65 mph (104.61 km/h) | 69.28 mph (111.49 km/h) |
| 70 mph (112.65 km/h) | 74.61 mph (120.07 km/h) |
| 75 mph (120.7 km/h) | 79.93 mph (128.64 km/h) |
| 80 mph (128.75 km/h) | 85.26 mph (137.22 km/h) |
| 85 mph (136.79 km/h) | 90.59 mph (145.79 km/h) |
| 90 mph (144.84 km/h) | 95.92 mph (154.37 km/h) |
| 95 mph (152.89 km/h) | 101.25 mph (162.95 km/h) |
| 100 mph (160.93 km/h) | 106.58 mph (171.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1584 | 1840 | 1982 | 2069 | 2164 | 2231 | 2305 | 2393 | 2514 | 2636 | 2770 | 2878 | 3074 | 3289 | 3458 | 3566 | 3626 | 3849 | 4159 | 4833 |
Better Fuel Economy Factory Ratios Increased Power
