Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/80-15 | 185/70-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.76 (629) | 25.2 (640) | 0.43 (11) 1.7% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 77.8 (1976.06) | 79.16 (2010.62) | 1.36 (34.56) 1.7% |
| Sidewall Height inches (mm) | 4.88 (124) | 5.1 (129.5) | 0.22 (5.5) 4.4% |
| Revolutions per mile (km) | 814.42 (506.06) | 800.42 (497.36) | -14 (-8.7) -1.7% |
185/70-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.35 mph (32.75 km/h) |
| 25 mph (40.23 km/h) | 25.44 mph (40.94 km/h) |
| 30 mph (48.28 km/h) | 30.52 mph (49.12 km/h) |
| 35 mph (56.33 km/h) | 35.61 mph (57.31 km/h) |
| 40 mph (64.37 km/h) | 40.7 mph (65.5 km/h) |
| 45 mph (72.42 km/h) | 45.79 mph (73.69 km/h) |
| 50 mph (80.47 km/h) | 50.87 mph (81.87 km/h) |
| 55 mph (88.51 km/h) | 55.96 mph (90.06 km/h) |
| 60 mph (96.56 km/h) | 61.05 mph (98.25 km/h) |
| 65 mph (104.61 km/h) | 66.14 mph (106.44 km/h) |
| 70 mph (112.65 km/h) | 71.22 mph (114.62 km/h) |
| 75 mph (120.7 km/h) | 76.31 mph (122.81 km/h) |
| 80 mph (128.75 km/h) | 81.4 mph (131 km/h) |
| 85 mph (136.79 km/h) | 86.49 mph (139.19 km/h) |
| 90 mph (144.84 km/h) | 91.57 mph (147.37 km/h) |
| 95 mph (152.89 km/h) | 96.66 mph (155.56 km/h) |
| 100 mph (160.93 km/h) | 101.75 mph (163.75 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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