Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/80-15 | 185/70-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.65 (677) | 25.2 (640) | -1.46 (-37) -5.5% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 83.73 (2126.86) | 79.16 (2010.62) | -4.58 (-116.24) -5.5% |
| Sidewall Height inches (mm) | 5.83 (148) | 5.1 (129.5) | -0.73 (-18.5) -12.5% |
| Revolutions per mile (km) | 756.68 (470.18) | 800.42 (497.36) | 43.75 (27.18) 5.8% |
185/70-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.91 mph (30.43 km/h) |
| 25 mph (40.23 km/h) | 23.63 mph (38.03 km/h) |
| 30 mph (48.28 km/h) | 28.36 mph (45.64 km/h) |
| 35 mph (56.33 km/h) | 33.09 mph (53.25 km/h) |
| 40 mph (64.37 km/h) | 37.81 mph (60.86 km/h) |
| 45 mph (72.42 km/h) | 42.54 mph (68.46 km/h) |
| 50 mph (80.47 km/h) | 47.27 mph (76.07 km/h) |
| 55 mph (88.51 km/h) | 51.99 mph (83.68 km/h) |
| 60 mph (96.56 km/h) | 56.72 mph (91.28 km/h) |
| 65 mph (104.61 km/h) | 61.45 mph (98.89 km/h) |
| 70 mph (112.65 km/h) | 66.17 mph (106.5 km/h) |
| 75 mph (120.7 km/h) | 70.9 mph (114.1 km/h) |
| 80 mph (128.75 km/h) | 75.63 mph (121.71 km/h) |
| 85 mph (136.79 km/h) | 80.35 mph (129.32 km/h) |
| 90 mph (144.84 km/h) | 85.08 mph (136.93 km/h) |
| 95 mph (152.89 km/h) | 89.81 mph (144.53 km/h) |
| 100 mph (160.93 km/h) | 94.53 mph (152.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2037 | 2366 | 2548 | 2661 | 2782 | 2869 | 2964 | 3077 | 3233 | 3389 | 3562 | 3701 | 3952 | 4230 | 4447 | 4585 | 4663 | 4949 | 5348 | 6215 |
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