Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/55-15 | 185/50-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.71 (551.5) | 22.28 (566) | 0.57 (14.5) 2.6% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 68.21 (1732.59) | 70.01 (1778.14) | 1.79 (45.55) 2.6% |
| Sidewall Height inches (mm) | 3.36 (85.25) | 3.64 (92.5) | 0.29 (7.25) 8.5% |
| Revolutions per mile (km) | 928.87 (577.17) | 905.07 (562.38) | -23.8 (-14.79) -2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.53 mph (33.03 km/h) |
| 25 mph (40.23 km/h) | 25.66 mph (41.29 km/h) |
| 30 mph (48.28 km/h) | 30.79 mph (49.55 km/h) |
| 35 mph (56.33 km/h) | 35.92 mph (57.81 km/h) |
| 40 mph (64.37 km/h) | 41.05 mph (66.07 km/h) |
| 45 mph (72.42 km/h) | 46.18 mph (74.32 km/h) |
| 50 mph (80.47 km/h) | 51.31 mph (82.58 km/h) |
| 55 mph (88.51 km/h) | 56.45 mph (90.84 km/h) |
| 60 mph (96.56 km/h) | 61.58 mph (99.1 km/h) |
| 65 mph (104.61 km/h) | 66.71 mph (107.36 km/h) |
| 70 mph (112.65 km/h) | 71.84 mph (115.62 km/h) |
| 75 mph (120.7 km/h) | 76.97 mph (123.87 km/h) |
| 80 mph (128.75 km/h) | 82.1 mph (132.13 km/h) |
| 85 mph (136.79 km/h) | 87.23 mph (140.39 km/h) |
| 90 mph (144.84 km/h) | 92.37 mph (148.65 km/h) |
| 95 mph (152.89 km/h) | 97.5 mph (156.91 km/h) |
| 100 mph (160.93 km/h) | 102.63 mph (165.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2303 | 2676 | 2881 | 3009 | 3146 | 3244 | 3352 | 3479 | 3656 | 3832 | 4028 | 4185 | 4469 | 4783 | 5028 | 5185 | 5273 | 5596 | 6047 | 7027 |
Better Fuel Economy Factory Ratios Increased Power
