Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/55-15 | 185/40-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.71 (551.5) | 22.83 (579.8) | 1.11 (28.3) 5.1% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 68.21 (1732.59) | 71.71 (1821.5) | 3.5 (88.91) 5.1% |
| Sidewall Height inches (mm) | 3.36 (85.25) | 2.91 (74) | -0.44 (-11.25) -13.2% |
| Revolutions per mile (km) | 928.87 (577.17) | 883.53 (549) | -45.34 (-28.17) -4.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.03 mph (33.84 km/h) |
| 25 mph (40.23 km/h) | 26.28 mph (42.3 km/h) |
| 30 mph (48.28 km/h) | 31.54 mph (50.76 km/h) |
| 35 mph (56.33 km/h) | 36.8 mph (59.22 km/h) |
| 40 mph (64.37 km/h) | 42.05 mph (67.68 km/h) |
| 45 mph (72.42 km/h) | 47.31 mph (76.14 km/h) |
| 50 mph (80.47 km/h) | 52.57 mph (84.6 km/h) |
| 55 mph (88.51 km/h) | 57.82 mph (93.06 km/h) |
| 60 mph (96.56 km/h) | 63.08 mph (101.52 km/h) |
| 65 mph (104.61 km/h) | 68.34 mph (109.98 km/h) |
| 70 mph (112.65 km/h) | 73.59 mph (118.44 km/h) |
| 75 mph (120.7 km/h) | 78.85 mph (126.89 km/h) |
| 80 mph (128.75 km/h) | 84.11 mph (135.35 km/h) |
| 85 mph (136.79 km/h) | 89.36 mph (143.81 km/h) |
| 90 mph (144.84 km/h) | 94.62 mph (152.27 km/h) |
| 95 mph (152.89 km/h) | 99.87 mph (160.73 km/h) |
| 100 mph (160.93 km/h) | 105.13 mph (169.19 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2248 | 2612 | 2813 | 2937 | 3071 | 3167 | 3272 | 3397 | 3569 | 3741 | 3932 | 4085 | 4363 | 4669 | 4908 | 5061 | 5147 | 5463 | 5903 | 6860 |
Better Fuel Economy Factory Ratios Increased Power
