Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/80-15 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.39 (645) | 24.47 (621.5) | -0.93 (-23.5) -3.6% |
| Width inches (mm) | 6.5 (165) | 7.28 (185) | 0.79 (20) 12.1% |
| Circum. inches (mm) | 79.78 (2026.33) | 76.87 (1952.5) | -2.91 (-73.83) -3.6% |
| Sidewall Height inches (mm) | 5.2 (132) | 4.73 (120.25) | -0.46 (-11.75) -8.9% |
| Revolutions per mile (km) | 794.22 (493.5) | 824.25 (512.16) | 30.03 (18.66) 3.8% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.27 mph (31.01 km/h) |
| 25 mph (40.23 km/h) | 24.09 mph (38.77 km/h) |
| 30 mph (48.28 km/h) | 28.91 mph (46.52 km/h) |
| 35 mph (56.33 km/h) | 33.72 mph (54.27 km/h) |
| 40 mph (64.37 km/h) | 38.54 mph (62.03 km/h) |
| 45 mph (72.42 km/h) | 43.36 mph (69.78 km/h) |
| 50 mph (80.47 km/h) | 48.18 mph (77.54 km/h) |
| 55 mph (88.51 km/h) | 53 mph (85.29 km/h) |
| 60 mph (96.56 km/h) | 57.81 mph (93.04 km/h) |
| 65 mph (104.61 km/h) | 62.63 mph (100.8 km/h) |
| 70 mph (112.65 km/h) | 67.45 mph (108.55 km/h) |
| 75 mph (120.7 km/h) | 72.27 mph (116.3 km/h) |
| 80 mph (128.75 km/h) | 77.09 mph (124.06 km/h) |
| 85 mph (136.79 km/h) | 81.9 mph (131.81 km/h) |
| 90 mph (144.84 km/h) | 86.72 mph (139.56 km/h) |
| 95 mph (152.89 km/h) | 91.54 mph (147.32 km/h) |
| 100 mph (160.93 km/h) | 96.36 mph (155.07 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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