Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/50-15 | 185/30-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 22.28 (566) | 19.37 (492) | -2.91 (-74) -13.1% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 70.01 (1778.14) | 60.85 (1545.66) | -9.15 (-232.48) -13.1% |
| Sidewall Height inches (mm) | 3.64 (92.5) | 2.19 (55.5) | -1.46 (-37) -40% |
| Revolutions per mile (km) | 905.07 (562.38) | 1041.2 (646.97) | 136.13 (84.59) 15% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.39 mph (27.98 km/h) |
| 25 mph (40.23 km/h) | 21.73 mph (34.97 km/h) |
| 30 mph (48.28 km/h) | 26.08 mph (41.97 km/h) |
| 35 mph (56.33 km/h) | 30.42 mph (48.96 km/h) |
| 40 mph (64.37 km/h) | 34.77 mph (55.96 km/h) |
| 45 mph (72.42 km/h) | 39.12 mph (62.95 km/h) |
| 50 mph (80.47 km/h) | 43.46 mph (69.95 km/h) |
| 55 mph (88.51 km/h) | 47.81 mph (76.94 km/h) |
| 60 mph (96.56 km/h) | 52.16 mph (83.94 km/h) |
| 65 mph (104.61 km/h) | 56.5 mph (90.93 km/h) |
| 70 mph (112.65 km/h) | 60.85 mph (97.93 km/h) |
| 75 mph (120.7 km/h) | 65.19 mph (104.92 km/h) |
| 80 mph (128.75 km/h) | 69.54 mph (111.92 km/h) |
| 85 mph (136.79 km/h) | 73.89 mph (118.91 km/h) |
| 90 mph (144.84 km/h) | 78.23 mph (125.9 km/h) |
| 95 mph (152.89 km/h) | 82.58 mph (132.9 km/h) |
| 100 mph (160.93 km/h) | 86.93 mph (139.89 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
