Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-13 | 185/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.54 (547.2) | 24.47 (621.5) | 2.93 (74.3) 13.6% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 67.68 (1719.08) | 76.87 (1952.5) | 9.19 (233.42) 13.6% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 4.73 (120.25) | 0.46 (11.75) 10.8% |
| Revolutions per mile (km) | 936.17 (581.71) | 824.25 (512.16) | -111.92 (-69.54) -12% |
185/65-15 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.72 mph (36.56 km/h) |
| 25 mph (40.23 km/h) | 28.39 mph (45.7 km/h) |
| 30 mph (48.28 km/h) | 34.07 mph (54.84 km/h) |
| 35 mph (56.33 km/h) | 39.75 mph (63.98 km/h) |
| 40 mph (64.37 km/h) | 45.43 mph (73.11 km/h) |
| 45 mph (72.42 km/h) | 51.11 mph (82.25 km/h) |
| 50 mph (80.47 km/h) | 56.79 mph (91.39 km/h) |
| 55 mph (88.51 km/h) | 62.47 mph (100.53 km/h) |
| 60 mph (96.56 km/h) | 68.15 mph (109.67 km/h) |
| 65 mph (104.61 km/h) | 73.83 mph (118.81 km/h) |
| 70 mph (112.65 km/h) | 79.5 mph (127.95 km/h) |
| 75 mph (120.7 km/h) | 85.18 mph (137.09 km/h) |
| 80 mph (128.75 km/h) | 90.86 mph (146.23 km/h) |
| 85 mph (136.79 km/h) | 96.54 mph (155.37 km/h) |
| 90 mph (144.84 km/h) | 102.22 mph (164.51 km/h) |
| 95 mph (152.89 km/h) | 107.9 mph (173.65 km/h) |
| 100 mph (160.93 km/h) | 113.58 mph (182.79 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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