Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 175/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 29.71 (754.7) | -0.69 (-17.5) -2.3% |
| Width inches (mm) | 6.89 (175) | 6.89 (175) | 0 (0) 0% |
| Circum. inches (mm) | 95.51 (2425.94) | 93.34 (2370.96) | -2.16 (-54.98) -2.3% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.86 (148.75) | -0.34 (-8.75) -5.6% |
| Revolutions per mile (km) | 663.39 (412.21) | 678.77 (421.77) | 15.38 (9.56) 2.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.55 mph (31.46 km/h) |
| 25 mph (40.23 km/h) | 24.43 mph (39.32 km/h) |
| 30 mph (48.28 km/h) | 29.32 mph (47.19 km/h) |
| 35 mph (56.33 km/h) | 34.21 mph (55.05 km/h) |
| 40 mph (64.37 km/h) | 39.09 mph (62.92 km/h) |
| 45 mph (72.42 km/h) | 43.98 mph (70.78 km/h) |
| 50 mph (80.47 km/h) | 48.87 mph (78.64 km/h) |
| 55 mph (88.51 km/h) | 53.75 mph (86.51 km/h) |
| 60 mph (96.56 km/h) | 58.64 mph (94.37 km/h) |
| 65 mph (104.61 km/h) | 63.53 mph (102.24 km/h) |
| 70 mph (112.65 km/h) | 68.41 mph (110.1 km/h) |
| 75 mph (120.7 km/h) | 73.3 mph (117.97 km/h) |
| 80 mph (128.75 km/h) | 78.19 mph (125.83 km/h) |
| 85 mph (136.79 km/h) | 83.07 mph (133.69 km/h) |
| 90 mph (144.84 km/h) | 87.96 mph (141.56 km/h) |
| 95 mph (152.89 km/h) | 92.85 mph (149.42 km/h) |
| 100 mph (160.93 km/h) | 97.73 mph (157.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1727 | 2007 | 2161 | 2257 | 2359 | 2433 | 2514 | 2609 | 2742 | 2874 | 3021 | 3139 | 3352 | 3587 | 3771 | 3888 | 3955 | 4197 | 4535 | 5270 |
Better Fuel Economy Factory Ratios Increased Power
