Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/55-15 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.71 (551.5) | 24.47 (621.5) | 2.76 (70) 12.7% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 68.21 (1732.59) | 76.87 (1952.5) | 8.66 (219.91) 12.7% |
| Sidewall Height inches (mm) | 3.36 (85.25) | 4.73 (120.25) | 1.38 (35) 41.1% |
| Revolutions per mile (km) | 928.87 (577.17) | 824.25 (512.16) | -104.62 (-65.01) -11.3% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.54 mph (36.27 km/h) |
| 25 mph (40.23 km/h) | 28.17 mph (45.34 km/h) |
| 30 mph (48.28 km/h) | 33.81 mph (54.41 km/h) |
| 35 mph (56.33 km/h) | 39.44 mph (63.48 km/h) |
| 40 mph (64.37 km/h) | 45.08 mph (72.54 km/h) |
| 45 mph (72.42 km/h) | 50.71 mph (81.61 km/h) |
| 50 mph (80.47 km/h) | 56.35 mph (90.68 km/h) |
| 55 mph (88.51 km/h) | 61.98 mph (99.75 km/h) |
| 60 mph (96.56 km/h) | 67.62 mph (108.82 km/h) |
| 65 mph (104.61 km/h) | 73.25 mph (117.89 km/h) |
| 70 mph (112.65 km/h) | 78.88 mph (126.95 km/h) |
| 75 mph (120.7 km/h) | 84.52 mph (136.02 km/h) |
| 80 mph (128.75 km/h) | 90.15 mph (145.09 km/h) |
| 85 mph (136.79 km/h) | 95.79 mph (154.16 km/h) |
| 90 mph (144.84 km/h) | 101.42 mph (163.23 km/h) |
| 95 mph (152.89 km/h) | 107.06 mph (172.29 km/h) |
| 100 mph (160.93 km/h) | 112.69 mph (181.36 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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