Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 120/70-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 27.61 (701.4) | 0.94 (24) 3.5% |
| Width inches (mm) | 3.15 (80) | 4.72 (120) | 1.57 (40) 50% |
| Circum. inches (mm) | 83.78 (2128.11) | 86.75 (2203.51) | 2.97 (75.4) 3.5% |
| Sidewall Height inches (mm) | 2.83 (72) | 3.31 (84) | 0.47 (12) 16.7% |
| Revolutions per mile (km) | 756.23 (469.9) | 730.35 (453.82) | -25.88 (-16.08) -3.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.71 mph (33.33 km/h) |
| 25 mph (40.23 km/h) | 25.89 mph (41.66 km/h) |
| 30 mph (48.28 km/h) | 31.06 mph (49.99 km/h) |
| 35 mph (56.33 km/h) | 36.24 mph (58.32 km/h) |
| 40 mph (64.37 km/h) | 41.42 mph (66.65 km/h) |
| 45 mph (72.42 km/h) | 46.59 mph (74.99 km/h) |
| 50 mph (80.47 km/h) | 51.77 mph (83.32 km/h) |
| 55 mph (88.51 km/h) | 56.95 mph (91.65 km/h) |
| 60 mph (96.56 km/h) | 62.13 mph (99.98 km/h) |
| 65 mph (104.61 km/h) | 67.3 mph (108.31 km/h) |
| 70 mph (112.65 km/h) | 72.48 mph (116.65 km/h) |
| 75 mph (120.7 km/h) | 77.66 mph (124.98 km/h) |
| 80 mph (128.75 km/h) | 82.83 mph (133.31 km/h) |
| 85 mph (136.79 km/h) | 88.01 mph (141.64 km/h) |
| 90 mph (144.84 km/h) | 93.19 mph (149.97 km/h) |
| 95 mph (152.89 km/h) | 98.37 mph (158.3 km/h) |
| 100 mph (160.93 km/h) | 103.54 mph (166.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1859 | 2159 | 2325 | 2428 | 2539 | 2618 | 2705 | 2808 | 2950 | 3092 | 3251 | 3377 | 3606 | 3860 | 4057 | 4184 | 4255 | 4516 | 4880 | 5671 |
Better Fuel Economy Factory Ratios Increased Power
