Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/30-20 | 185/35-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.08 (637) | 22.1 (561.3) | -2.98 (-75.7) -11.9% |
| Width inches (mm) | 8.46 (215) | 7.28 (185) | -1.18 (-30) -14% |
| Circum. inches (mm) | 78.79 (2001.19) | 69.42 (1763.38) | -9.36 (-237.82) -11.9% |
| Sidewall Height inches (mm) | 2.54 (64.5) | 2.55 (64.75) | 0.01 (0.25) 0.4% |
| Revolutions per mile (km) | 804.19 (499.7) | 912.65 (567.09) | 108.46 (67.39) 13.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.62 mph (28.36 km/h) |
| 25 mph (40.23 km/h) | 22.03 mph (35.45 km/h) |
| 30 mph (48.28 km/h) | 26.43 mph (42.54 km/h) |
| 35 mph (56.33 km/h) | 30.84 mph (49.63 km/h) |
| 40 mph (64.37 km/h) | 35.25 mph (56.72 km/h) |
| 45 mph (72.42 km/h) | 39.65 mph (63.81 km/h) |
| 50 mph (80.47 km/h) | 44.06 mph (70.9 km/h) |
| 55 mph (88.51 km/h) | 48.46 mph (78 km/h) |
| 60 mph (96.56 km/h) | 52.87 mph (85.09 km/h) |
| 65 mph (104.61 km/h) | 57.28 mph (92.18 km/h) |
| 70 mph (112.65 km/h) | 61.68 mph (99.27 km/h) |
| 75 mph (120.7 km/h) | 66.09 mph (106.36 km/h) |
| 80 mph (128.75 km/h) | 70.49 mph (113.45 km/h) |
| 85 mph (136.79 km/h) | 74.9 mph (120.54 km/h) |
| 90 mph (144.84 km/h) | 79.3 mph (127.63 km/h) |
| 95 mph (152.89 km/h) | 83.71 mph (134.72 km/h) |
| 100 mph (160.93 km/h) | 88.12 mph (141.81 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2323 | 2698 | 2906 | 3034 | 3172 | 3271 | 3380 | 3508 | 3686 | 3864 | 4062 | 4220 | 4507 | 4823 | 5070 | 5228 | 5317 | 5643 | 6098 | 7086 |
Better Fuel Economy Factory Ratios Increased Power
