Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/60-15 | 185/55-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.85 (555) | 23.01 (584.5) | 1.16 (29.5) 5.3% |
| Width inches (mm) | 5.71 (145) | 7.28 (185) | 1.57 (40) 27.6% |
| Circum. inches (mm) | 68.65 (1743.58) | 72.29 (1836.26) | 3.65 (92.68) 5.3% |
| Sidewall Height inches (mm) | 3.43 (87) | 4.01 (101.75) | 0.58 (14.75) 17% |
| Revolutions per mile (km) | 923.01 (573.53) | 876.42 (544.58) | -46.58 (-28.95) -5% |
185/55-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.06 mph (33.9 km/h) |
| 25 mph (40.23 km/h) | 26.33 mph (42.37 km/h) |
| 30 mph (48.28 km/h) | 31.59 mph (50.85 km/h) |
| 35 mph (56.33 km/h) | 36.86 mph (59.32 km/h) |
| 40 mph (64.37 km/h) | 42.13 mph (67.8 km/h) |
| 45 mph (72.42 km/h) | 47.39 mph (76.27 km/h) |
| 50 mph (80.47 km/h) | 52.66 mph (84.74 km/h) |
| 55 mph (88.51 km/h) | 57.92 mph (93.22 km/h) |
| 60 mph (96.56 km/h) | 63.19 mph (101.69 km/h) |
| 65 mph (104.61 km/h) | 68.45 mph (110.17 km/h) |
| 70 mph (112.65 km/h) | 73.72 mph (118.64 km/h) |
| 75 mph (120.7 km/h) | 78.99 mph (127.12 km/h) |
| 80 mph (128.75 km/h) | 84.25 mph (135.59 km/h) |
| 85 mph (136.79 km/h) | 89.52 mph (144.07 km/h) |
| 90 mph (144.84 km/h) | 94.78 mph (152.54 km/h) |
| 95 mph (152.89 km/h) | 100.05 mph (161.01 km/h) |
| 100 mph (160.93 km/h) | 105.32 mph (169.49 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 |
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