Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-10 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 19.13 (486) | 24.47 (621.5) | 5.33 (135.5) 27.9% |
| Width inches (mm) | 5.71 (145) | 7.28 (185) | 1.57 (40) 27.6% |
| Circum. inches (mm) | 60.11 (1526.81) | 76.87 (1952.5) | 16.76 (425.69) 27.9% |
| Sidewall Height inches (mm) | 4.57 (116) | 4.73 (120.25) | 0.17 (4.25) 3.7% |
| Revolutions per mile (km) | 1054.05 (654.96) | 824.25 (512.16) | -229.81 (-142.79) -21.8% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.58 mph (41.16 km/h) |
| 25 mph (40.23 km/h) | 31.97 mph (51.45 km/h) |
| 30 mph (48.28 km/h) | 38.36 mph (61.74 km/h) |
| 35 mph (56.33 km/h) | 44.76 mph (72.03 km/h) |
| 40 mph (64.37 km/h) | 51.15 mph (82.32 km/h) |
| 45 mph (72.42 km/h) | 57.55 mph (92.61 km/h) |
| 50 mph (80.47 km/h) | 63.94 mph (102.9 km/h) |
| 55 mph (88.51 km/h) | 70.33 mph (113.19 km/h) |
| 60 mph (96.56 km/h) | 76.73 mph (123.48 km/h) |
| 65 mph (104.61 km/h) | 83.12 mph (133.77 km/h) |
| 70 mph (112.65 km/h) | 89.52 mph (144.06 km/h) |
| 75 mph (120.7 km/h) | 95.91 mph (154.35 km/h) |
| 80 mph (128.75 km/h) | 102.3 mph (164.64 km/h) |
| 85 mph (136.79 km/h) | 108.7 mph (174.93 km/h) |
| 90 mph (144.84 km/h) | 115.09 mph (185.22 km/h) |
| 95 mph (152.89 km/h) | 121.49 mph (195.51 km/h) |
| 100 mph (160.93 km/h) | 127.88 mph (205.8 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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