Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 200/55-18 | 120/90-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.66 (677.2) | 29.5 (749.4) | 2.84 (72.2) 10.7% |
| Width inches (mm) | 7.87 (200) | 4.72 (120) | -3.15 (-80) -40% |
| Circum. inches (mm) | 83.76 (2127.49) | 92.69 (2354.31) | 8.93 (226.82) 10.7% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.25 (108) | -0.08 (-2) -1.8% |
| Revolutions per mile (km) | 756.45 (470.04) | 683.57 (424.75) | -72.88 (-45.29) -9.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.13 mph (35.62 km/h) |
| 25 mph (40.23 km/h) | 27.67 mph (44.52 km/h) |
| 30 mph (48.28 km/h) | 33.2 mph (53.43 km/h) |
| 35 mph (56.33 km/h) | 38.73 mph (62.33 km/h) |
| 40 mph (64.37 km/h) | 44.26 mph (71.24 km/h) |
| 45 mph (72.42 km/h) | 49.8 mph (80.14 km/h) |
| 50 mph (80.47 km/h) | 55.33 mph (89.05 km/h) |
| 55 mph (88.51 km/h) | 60.86 mph (97.95 km/h) |
| 60 mph (96.56 km/h) | 66.4 mph (106.86 km/h) |
| 65 mph (104.61 km/h) | 71.93 mph (115.76 km/h) |
| 70 mph (112.65 km/h) | 77.46 mph (124.66 km/h) |
| 75 mph (120.7 km/h) | 83 mph (133.57 km/h) |
| 80 mph (128.75 km/h) | 88.53 mph (142.47 km/h) |
| 85 mph (136.79 km/h) | 94.06 mph (151.38 km/h) |
| 90 mph (144.84 km/h) | 99.6 mph (160.28 km/h) |
| 95 mph (152.89 km/h) | 105.13 mph (169.19 km/h) |
| 100 mph (160.93 km/h) | 110.66 mph (178.09 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1740 | 2021 | 2176 | 2273 | 2376 | 2450 | 2532 | 2628 | 2761 | 2894 | 3042 | 3161 | 3375 | 3612 | 3797 | 3916 | 3982 | 4227 | 4567 | 5308 |
Better Fuel Economy Factory Ratios Increased Power
