Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/85-13 | 185/80-13 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.71 (627.7) | 24.65 (626.2) | -0.06 (-1.5) -0.2% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 77.64 (1971.98) | 77.45 (1967.27) | -0.19 (-4.71) -0.2% |
| Sidewall Height inches (mm) | 5.86 (148.75) | 5.83 (148) | -0.03 (-0.75) -0.5% |
| Revolutions per mile (km) | 816.11 (507.1) | 818.06 (508.32) | 1.95 (1.21) 0.2% |
185/80-13 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.95 mph (32.11 km/h) |
| 25 mph (40.23 km/h) | 24.94 mph (40.14 km/h) |
| 30 mph (48.28 km/h) | 29.93 mph (48.17 km/h) |
| 35 mph (56.33 km/h) | 34.92 mph (56.19 km/h) |
| 40 mph (64.37 km/h) | 39.9 mph (64.22 km/h) |
| 45 mph (72.42 km/h) | 44.89 mph (72.25 km/h) |
| 50 mph (80.47 km/h) | 49.88 mph (80.28 km/h) |
| 55 mph (88.51 km/h) | 54.87 mph (88.3 km/h) |
| 60 mph (96.56 km/h) | 59.86 mph (96.33 km/h) |
| 65 mph (104.61 km/h) | 64.84 mph (104.36 km/h) |
| 70 mph (112.65 km/h) | 69.83 mph (112.39 km/h) |
| 75 mph (120.7 km/h) | 74.82 mph (120.41 km/h) |
| 80 mph (128.75 km/h) | 79.81 mph (128.44 km/h) |
| 85 mph (136.79 km/h) | 84.8 mph (136.47 km/h) |
| 90 mph (144.84 km/h) | 89.78 mph (144.5 km/h) |
| 95 mph (152.89 km/h) | 94.77 mph (152.52 km/h) |
| 100 mph (160.93 km/h) | 99.76 mph (160.55 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2082 | 2418 | 2604 | 2720 | 2844 | 2932 | 3030 | 3145 | 3304 | 3464 | 3641 | 3783 | 4040 | 4323 | 4545 | 4686 | 4766 | 5058 | 5466 | 6352 |
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