Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/30-20 | 215/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.08 (637) | 26.77 (680) | 1.69 (43) 6.8% |
| Width inches (mm) | 8.46 (215) | 8.46 (215) | 0 (0) 0% |
| Circum. inches (mm) | 78.79 (2001.19) | 84.11 (2136.28) | 5.32 (135.09) 6.8% |
| Sidewall Height inches (mm) | 2.54 (64.5) | 3.39 (86) | 0.85 (21.5) 33.3% |
| Revolutions per mile (km) | 804.19 (499.7) | 753.34 (468.1) | -50.85 (-31.6) -6.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.35 mph (34.36 km/h) |
| 25 mph (40.23 km/h) | 26.69 mph (42.95 km/h) |
| 30 mph (48.28 km/h) | 32.03 mph (51.54 km/h) |
| 35 mph (56.33 km/h) | 37.36 mph (60.13 km/h) |
| 40 mph (64.37 km/h) | 42.7 mph (68.72 km/h) |
| 45 mph (72.42 km/h) | 48.04 mph (77.31 km/h) |
| 50 mph (80.47 km/h) | 53.38 mph (85.9 km/h) |
| 55 mph (88.51 km/h) | 58.71 mph (94.49 km/h) |
| 60 mph (96.56 km/h) | 64.05 mph (103.08 km/h) |
| 65 mph (104.61 km/h) | 69.39 mph (111.67 km/h) |
| 70 mph (112.65 km/h) | 74.73 mph (120.26 km/h) |
| 75 mph (120.7 km/h) | 80.06 mph (128.85 km/h) |
| 80 mph (128.75 km/h) | 85.4 mph (137.44 km/h) |
| 85 mph (136.79 km/h) | 90.74 mph (146.03 km/h) |
| 90 mph (144.84 km/h) | 96.08 mph (154.62 km/h) |
| 95 mph (152.89 km/h) | 101.41 mph (163.21 km/h) |
| 100 mph (160.93 km/h) | 106.75 mph (171.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1917 | 2227 | 2398 | 2504 | 2619 | 2700 | 2790 | 2896 | 3043 | 3190 | 3353 | 3483 | 3720 | 3981 | 4185 | 4316 | 4389 | 4658 | 5033 | 5849 |
Better Fuel Economy Factory Ratios Increased Power
