Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 24.47 (621.5) | -3 (-76.2) -10.9% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 86.29 (2191.89) | 76.87 (1952.5) | -9.42 (-239.39) -10.9% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 4.73 (120.25) | 0 (0) 0% |
| Revolutions per mile (km) | 734.23 (456.23) | 824.25 (512.16) | 90.02 (55.94) 12.3% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.82 mph (28.67 km/h) |
| 25 mph (40.23 km/h) | 22.27 mph (35.84 km/h) |
| 30 mph (48.28 km/h) | 26.72 mph (43.01 km/h) |
| 35 mph (56.33 km/h) | 31.18 mph (50.18 km/h) |
| 40 mph (64.37 km/h) | 35.63 mph (57.34 km/h) |
| 45 mph (72.42 km/h) | 40.09 mph (64.51 km/h) |
| 50 mph (80.47 km/h) | 44.54 mph (71.68 km/h) |
| 55 mph (88.51 km/h) | 48.99 mph (78.85 km/h) |
| 60 mph (96.56 km/h) | 53.45 mph (86.01 km/h) |
| 65 mph (104.61 km/h) | 57.9 mph (93.18 km/h) |
| 70 mph (112.65 km/h) | 62.35 mph (100.35 km/h) |
| 75 mph (120.7 km/h) | 66.81 mph (107.52 km/h) |
| 80 mph (128.75 km/h) | 71.26 mph (114.69 km/h) |
| 85 mph (136.79 km/h) | 75.72 mph (121.85 km/h) |
| 90 mph (144.84 km/h) | 80.17 mph (129.02 km/h) |
| 95 mph (152.89 km/h) | 84.62 mph (136.19 km/h) |
| 100 mph (160.93 km/h) | 89.08 mph (143.36 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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