Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 185/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 29.65 (753.2) | -0.75 (-19) -2.5% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 95.51 (2425.94) | 93.16 (2366.25) | -2.35 (-59.69) -2.5% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.83 (148) | -0.37 (-9.5) -6% |
| Revolutions per mile (km) | 663.39 (412.21) | 680.12 (422.61) | 16.73 (10.4) 2.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.51 mph (31.39 km/h) |
| 25 mph (40.23 km/h) | 24.38 mph (39.24 km/h) |
| 30 mph (48.28 km/h) | 29.26 mph (47.09 km/h) |
| 35 mph (56.33 km/h) | 34.14 mph (54.94 km/h) |
| 40 mph (64.37 km/h) | 39.02 mph (62.79 km/h) |
| 45 mph (72.42 km/h) | 43.89 mph (70.64 km/h) |
| 50 mph (80.47 km/h) | 48.77 mph (78.49 km/h) |
| 55 mph (88.51 km/h) | 53.65 mph (86.34 km/h) |
| 60 mph (96.56 km/h) | 58.52 mph (94.18 km/h) |
| 65 mph (104.61 km/h) | 63.4 mph (102.03 km/h) |
| 70 mph (112.65 km/h) | 68.28 mph (109.88 km/h) |
| 75 mph (120.7 km/h) | 73.15 mph (117.73 km/h) |
| 80 mph (128.75 km/h) | 78.03 mph (125.58 km/h) |
| 85 mph (136.79 km/h) | 82.91 mph (133.43 km/h) |
| 90 mph (144.84 km/h) | 87.79 mph (141.28 km/h) |
| 95 mph (152.89 km/h) | 92.66 mph (149.13 km/h) |
| 100 mph (160.93 km/h) | 97.54 mph (156.97 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1731 | 2011 | 2165 | 2261 | 2364 | 2438 | 2519 | 2615 | 2747 | 2880 | 3027 | 3145 | 3358 | 3594 | 3778 | 3896 | 3962 | 4205 | 4544 | 5281 |
Better Fuel Economy Factory Ratios Increased Power
