Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/65-20 | 205/55-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.49 (774.5) | 29.88 (758.9) | -0.61 (-15.6) -2% |
| Width inches (mm) | 8.07 (205) | 8.07 (205) | 0 (0) 0% |
| Circum. inches (mm) | 95.79 (2433.16) | 93.86 (2384.15) | -1.93 (-49.01) -2% |
| Sidewall Height inches (mm) | 5.25 (133.25) | 4.44 (112.75) | -0.81 (-20.5) -15.4% |
| Revolutions per mile (km) | 661.42 (410.99) | 675.02 (419.44) | 13.6 (8.45) 2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.6 mph (31.54 km/h) |
| 25 mph (40.23 km/h) | 24.5 mph (39.42 km/h) |
| 30 mph (48.28 km/h) | 29.4 mph (47.31 km/h) |
| 35 mph (56.33 km/h) | 34.3 mph (55.19 km/h) |
| 40 mph (64.37 km/h) | 39.19 mph (63.08 km/h) |
| 45 mph (72.42 km/h) | 44.09 mph (70.96 km/h) |
| 50 mph (80.47 km/h) | 48.99 mph (78.85 km/h) |
| 55 mph (88.51 km/h) | 53.89 mph (86.73 km/h) |
| 60 mph (96.56 km/h) | 58.79 mph (94.62 km/h) |
| 65 mph (104.61 km/h) | 63.69 mph (102.5 km/h) |
| 70 mph (112.65 km/h) | 68.59 mph (110.39 km/h) |
| 75 mph (120.7 km/h) | 73.49 mph (118.27 km/h) |
| 80 mph (128.75 km/h) | 78.39 mph (126.15 km/h) |
| 85 mph (136.79 km/h) | 83.29 mph (134.04 km/h) |
| 90 mph (144.84 km/h) | 88.19 mph (141.92 km/h) |
| 95 mph (152.89 km/h) | 93.09 mph (149.81 km/h) |
| 100 mph (160.93 km/h) | 97.99 mph (157.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1718 | 1996 | 2149 | 2244 | 2346 | 2420 | 2500 | 2595 | 2727 | 2858 | 3004 | 3121 | 3333 | 3567 | 3750 | 3867 | 3933 | 4174 | 4510 | 5241 |
Better Fuel Economy Factory Ratios Increased Power
