Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/70-14 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 20.34 (516.6) | 24.47 (621.5) | 4.13 (104.9) 20.3% |
| Width inches (mm) | 4.53 (115) | 7.28 (185) | 2.76 (70) 60.9% |
| Circum. inches (mm) | 63.9 (1622.95) | 76.87 (1952.5) | 12.97 (329.55) 20.3% |
| Sidewall Height inches (mm) | 3.17 (80.5) | 4.73 (120.25) | 1.56 (39.75) 49.4% |
| Revolutions per mile (km) | 991.62 (616.16) | 824.25 (512.16) | -167.37 (-104) -16.9% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.06 mph (38.72 km/h) |
| 25 mph (40.23 km/h) | 30.08 mph (48.4 km/h) |
| 30 mph (48.28 km/h) | 36.09 mph (58.08 km/h) |
| 35 mph (56.33 km/h) | 42.11 mph (67.76 km/h) |
| 40 mph (64.37 km/h) | 48.12 mph (77.45 km/h) |
| 45 mph (72.42 km/h) | 54.14 mph (87.13 km/h) |
| 50 mph (80.47 km/h) | 60.15 mph (96.81 km/h) |
| 55 mph (88.51 km/h) | 66.17 mph (106.49 km/h) |
| 60 mph (96.56 km/h) | 72.18 mph (116.17 km/h) |
| 65 mph (104.61 km/h) | 78.2 mph (125.85 km/h) |
| 70 mph (112.65 km/h) | 84.21 mph (135.53 km/h) |
| 75 mph (120.7 km/h) | 90.23 mph (145.21 km/h) |
| 80 mph (128.75 km/h) | 96.24 mph (154.89 km/h) |
| 85 mph (136.79 km/h) | 102.26 mph (164.57 km/h) |
| 90 mph (144.84 km/h) | 108.28 mph (174.25 km/h) |
| 95 mph (152.89 km/h) | 114.29 mph (183.93 km/h) |
| 100 mph (160.93 km/h) | 120.31 mph (193.61 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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