Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/45-15 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.56 (547.5) | 24.47 (621.5) | 2.91 (74) 13.5% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 67.72 (1720.02) | 76.87 (1952.5) | 9.15 (232.48) 13.5% |
| Sidewall Height inches (mm) | 3.28 (83.25) | 4.73 (120.25) | 1.46 (37) 44.4% |
| Revolutions per mile (km) | 935.65 (581.39) | 824.25 (512.16) | -111.41 (-69.22) -11.9% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.7 mph (36.54 km/h) |
| 25 mph (40.23 km/h) | 28.38 mph (45.67 km/h) |
| 30 mph (48.28 km/h) | 34.05 mph (54.81 km/h) |
| 35 mph (56.33 km/h) | 39.73 mph (63.94 km/h) |
| 40 mph (64.37 km/h) | 45.41 mph (73.07 km/h) |
| 45 mph (72.42 km/h) | 51.08 mph (82.21 km/h) |
| 50 mph (80.47 km/h) | 56.76 mph (91.34 km/h) |
| 55 mph (88.51 km/h) | 62.43 mph (100.48 km/h) |
| 60 mph (96.56 km/h) | 68.11 mph (109.61 km/h) |
| 65 mph (104.61 km/h) | 73.79 mph (118.75 km/h) |
| 70 mph (112.65 km/h) | 79.46 mph (127.88 km/h) |
| 75 mph (120.7 km/h) | 85.14 mph (137.01 km/h) |
| 80 mph (128.75 km/h) | 90.81 mph (146.15 km/h) |
| 85 mph (136.79 km/h) | 96.49 mph (155.28 km/h) |
| 90 mph (144.84 km/h) | 102.16 mph (164.42 km/h) |
| 95 mph (152.89 km/h) | 107.84 mph (173.55 km/h) |
| 100 mph (160.93 km/h) | 113.52 mph (182.69 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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