Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-15 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 22.99 (584) | 24.47 (621.5) | 1.48 (37.5) 6.4% |
| Width inches (mm) | 5.71 (145) | 7.28 (185) | 1.57 (40) 27.6% |
| Circum. inches (mm) | 72.23 (1834.69) | 76.87 (1952.5) | 4.64 (117.81) 6.4% |
| Sidewall Height inches (mm) | 4 (101.5) | 4.73 (120.25) | 0.74 (18.75) 18.5% |
| Revolutions per mile (km) | 877.17 (545.05) | 824.25 (512.16) | -52.93 (-32.89) -6% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.28 mph (34.25 km/h) |
| 25 mph (40.23 km/h) | 26.61 mph (42.82 km/h) |
| 30 mph (48.28 km/h) | 31.93 mph (51.38 km/h) |
| 35 mph (56.33 km/h) | 37.25 mph (59.94 km/h) |
| 40 mph (64.37 km/h) | 42.57 mph (68.51 km/h) |
| 45 mph (72.42 km/h) | 47.89 mph (77.07 km/h) |
| 50 mph (80.47 km/h) | 53.21 mph (85.63 km/h) |
| 55 mph (88.51 km/h) | 58.53 mph (94.2 km/h) |
| 60 mph (96.56 km/h) | 63.85 mph (102.76 km/h) |
| 65 mph (104.61 km/h) | 69.17 mph (111.32 km/h) |
| 70 mph (112.65 km/h) | 74.49 mph (119.89 km/h) |
| 75 mph (120.7 km/h) | 79.82 mph (128.45 km/h) |
| 80 mph (128.75 km/h) | 85.14 mph (137.01 km/h) |
| 85 mph (136.79 km/h) | 90.46 mph (145.58 km/h) |
| 90 mph (144.84 km/h) | 95.78 mph (154.14 km/h) |
| 95 mph (152.89 km/h) | 101.1 mph (162.71 km/h) |
| 100 mph (160.93 km/h) | 106.42 mph (171.27 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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