Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/40-15 | 185/40-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.77 (553) | 20.83 (529) | -0.94 (-24) -4.3% |
| Width inches (mm) | 8.46 (215) | 7.28 (185) | -1.18 (-30) -14% |
| Circum. inches (mm) | 68.4 (1737.3) | 65.43 (1661.9) | -2.97 (-75.4) -4.3% |
| Sidewall Height inches (mm) | 3.39 (86) | 2.91 (74) | -0.47 (-12) -14% |
| Revolutions per mile (km) | 926.35 (575.6) | 968.37 (601.72) | 42.03 (26.11) 4.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.13 mph (30.79 km/h) |
| 25 mph (40.23 km/h) | 23.92 mph (38.49 km/h) |
| 30 mph (48.28 km/h) | 28.7 mph (46.19 km/h) |
| 35 mph (56.33 km/h) | 33.48 mph (53.88 km/h) |
| 40 mph (64.37 km/h) | 38.26 mph (61.58 km/h) |
| 45 mph (72.42 km/h) | 43.05 mph (69.28 km/h) |
| 50 mph (80.47 km/h) | 47.83 mph (76.98 km/h) |
| 55 mph (88.51 km/h) | 52.61 mph (84.67 km/h) |
| 60 mph (96.56 km/h) | 57.4 mph (92.37 km/h) |
| 65 mph (104.61 km/h) | 62.18 mph (100.07 km/h) |
| 70 mph (112.65 km/h) | 66.96 mph (107.77 km/h) |
| 75 mph (120.7 km/h) | 71.75 mph (115.46 km/h) |
| 80 mph (128.75 km/h) | 76.53 mph (123.16 km/h) |
| 85 mph (136.79 km/h) | 81.31 mph (130.86 km/h) |
| 90 mph (144.84 km/h) | 86.09 mph (138.56 km/h) |
| 95 mph (152.89 km/h) | 90.88 mph (146.25 km/h) |
| 100 mph (160.93 km/h) | 95.66 mph (153.95 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
