Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/80-15 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 22.87 (581) | 24.47 (621.5) | 1.59 (40.5) 7% |
| Width inches (mm) | 4.92 (125) | 7.28 (185) | 2.36 (60) 48% |
| Circum. inches (mm) | 71.86 (1825.27) | 76.87 (1952.5) | 5.01 (127.23) 7% |
| Sidewall Height inches (mm) | 3.94 (100) | 4.73 (120.25) | 0.8 (20.25) 20.3% |
| Revolutions per mile (km) | 881.7 (547.86) | 824.25 (512.16) | -57.46 (-35.7) -6.5% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.39 mph (34.43 km/h) |
| 25 mph (40.23 km/h) | 26.74 mph (43.04 km/h) |
| 30 mph (48.28 km/h) | 32.09 mph (51.65 km/h) |
| 35 mph (56.33 km/h) | 37.44 mph (60.25 km/h) |
| 40 mph (64.37 km/h) | 42.79 mph (68.86 km/h) |
| 45 mph (72.42 km/h) | 48.14 mph (77.47 km/h) |
| 50 mph (80.47 km/h) | 53.49 mph (86.08 km/h) |
| 55 mph (88.51 km/h) | 58.83 mph (94.68 km/h) |
| 60 mph (96.56 km/h) | 64.18 mph (103.29 km/h) |
| 65 mph (104.61 km/h) | 69.53 mph (111.9 km/h) |
| 70 mph (112.65 km/h) | 74.88 mph (120.51 km/h) |
| 75 mph (120.7 km/h) | 80.23 mph (129.11 km/h) |
| 80 mph (128.75 km/h) | 85.58 mph (137.72 km/h) |
| 85 mph (136.79 km/h) | 90.93 mph (146.33 km/h) |
| 90 mph (144.84 km/h) | 96.27 mph (154.94 km/h) |
| 95 mph (152.89 km/h) | 101.62 mph (163.55 km/h) |
| 100 mph (160.93 km/h) | 106.97 mph (172.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2098 | 2437 | 2624 | 2740 | 2865 | 2954 | 3053 | 3169 | 3329 | 3490 | 3668 | 3811 | 4070 | 4356 | 4579 | 4722 | 4802 | 5097 | 5507 | 6400 |
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