Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/60-15 | 185/55-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.5 (597) | 23.01 (584.5) | -0.49 (-12.5) -2.1% |
| Width inches (mm) | 7.09 (180) | 7.28 (185) | 0.2 (5) 2.8% |
| Circum. inches (mm) | 73.84 (1875.53) | 72.29 (1836.26) | -1.55 (-39.27) -2.1% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.01 (101.75) | -0.25 (-6.25) -5.8% |
| Revolutions per mile (km) | 858.07 (533.18) | 876.42 (544.58) | 18.35 (11.4) 2.1% |
185/55-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.51 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.39 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.27 km/h) |
| 35 mph (56.33 km/h) | 34.27 mph (55.15 km/h) |
| 40 mph (64.37 km/h) | 39.16 mph (63.03 km/h) |
| 45 mph (72.42 km/h) | 44.06 mph (70.9 km/h) |
| 50 mph (80.47 km/h) | 48.95 mph (78.78 km/h) |
| 55 mph (88.51 km/h) | 53.85 mph (86.66 km/h) |
| 60 mph (96.56 km/h) | 58.74 mph (94.54 km/h) |
| 65 mph (104.61 km/h) | 63.64 mph (102.42 km/h) |
| 70 mph (112.65 km/h) | 68.53 mph (110.3 km/h) |
| 75 mph (120.7 km/h) | 73.43 mph (118.17 km/h) |
| 80 mph (128.75 km/h) | 78.32 mph (126.05 km/h) |
| 85 mph (136.79 km/h) | 83.22 mph (133.93 km/h) |
| 90 mph (144.84 km/h) | 88.12 mph (141.81 km/h) |
| 95 mph (152.89 km/h) | 93.01 mph (149.69 km/h) |
| 100 mph (160.93 km/h) | 97.91 mph (157.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2230 | 2591 | 2790 | 2914 | 3047 | 3141 | 3246 | 3369 | 3540 | 3711 | 3901 | 4053 | 4328 | 4631 | 4869 | 5021 | 5106 | 5419 | 5856 | 6805 |
Better Fuel Economy Factory Ratios Increased Power
