Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/80-14 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.02 (635.6) | 24.47 (621.5) | -0.56 (-14.1) -2.2% |
| Width inches (mm) | 6.89 (175) | 7.28 (185) | 0.39 (10) 5.7% |
| Circum. inches (mm) | 78.61 (1996.8) | 76.87 (1952.5) | -1.74 (-44.3) -2.2% |
| Sidewall Height inches (mm) | 5.51 (140) | 4.73 (120.25) | -0.78 (-19.75) -14.1% |
| Revolutions per mile (km) | 805.96 (500.8) | 824.25 (512.16) | 18.28 (11.36) 2.3% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.56 mph (31.47 km/h) |
| 25 mph (40.23 km/h) | 24.45 mph (39.34 km/h) |
| 30 mph (48.28 km/h) | 29.33 mph (47.21 km/h) |
| 35 mph (56.33 km/h) | 34.22 mph (55.08 km/h) |
| 40 mph (64.37 km/h) | 39.11 mph (62.95 km/h) |
| 45 mph (72.42 km/h) | 44 mph (70.81 km/h) |
| 50 mph (80.47 km/h) | 48.89 mph (78.68 km/h) |
| 55 mph (88.51 km/h) | 53.78 mph (86.55 km/h) |
| 60 mph (96.56 km/h) | 58.67 mph (94.42 km/h) |
| 65 mph (104.61 km/h) | 63.56 mph (102.29 km/h) |
| 70 mph (112.65 km/h) | 68.45 mph (110.16 km/h) |
| 75 mph (120.7 km/h) | 73.34 mph (118.02 km/h) |
| 80 mph (128.75 km/h) | 78.23 mph (125.89 km/h) |
| 85 mph (136.79 km/h) | 83.11 mph (133.76 km/h) |
| 90 mph (144.84 km/h) | 88 mph (141.63 km/h) |
| 95 mph (152.89 km/h) | 92.89 mph (149.5 km/h) |
| 100 mph (160.93 km/h) | 97.78 mph (157.36 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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