Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/70-21 | 110/70-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.61 (701.4) | 27.06 (687.4) | -0.55 (-14) -2% |
| Width inches (mm) | 4.72 (120) | 4.33 (110) | -0.39 (-10) -8.3% |
| Circum. inches (mm) | 86.75 (2203.51) | 85.02 (2159.53) | -1.73 (-43.98) -2% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.03 (77) | -0.28 (-7) -8.3% |
| Revolutions per mile (km) | 730.35 (453.82) | 745.23 (463.06) | 14.87 (9.24) 2% |
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 (39.43 km/h) |
| 30 mph (48.28 km/h) | 29.4 mph (47.32 km/h) |
| 35 mph (56.33 km/h) | 34.3 mph (55.2 km/h) |
| 40 mph (64.37 km/h) | 39.2 mph (63.09 km/h) |
| 45 mph (72.42 km/h) | 44.1 mph (70.98 km/h) |
| 50 mph (80.47 km/h) | 49 mph (78.86 km/h) |
| 55 mph (88.51 km/h) | 53.9 mph (86.75 km/h) |
| 60 mph (96.56 km/h) | 58.8 mph (94.63 km/h) |
| 65 mph (104.61 km/h) | 63.7 mph (102.52 km/h) |
| 70 mph (112.65 km/h) | 68.6 mph (110.41 km/h) |
| 75 mph (120.7 km/h) | 73.5 mph (118.29 km/h) |
| 80 mph (128.75 km/h) | 78.4 mph (126.18 km/h) |
| 85 mph (136.79 km/h) | 83.3 mph (134.06 km/h) |
| 90 mph (144.84 km/h) | 88.2 mph (141.95 km/h) |
| 95 mph (152.89 km/h) | 93.1 mph (149.84 km/h) |
| 100 mph (160.93 km/h) | 98 mph (157.72 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1896 | 2203 | 2373 | 2478 | 2590 | 2671 | 2760 | 2865 | 3010 | 3155 | 3317 | 3446 | 3680 | 3938 | 4140 | 4269 | 4342 | 4608 | 4979 | 5786 |
Better Fuel Economy Factory Ratios Increased Power
