Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 80/80-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 26.04 (661.4) | -0.63 (-16) -2.4% |
| Width inches (mm) | 3.15 (80) | 3.15 (80) | 0 (0) 0% |
| Circum. inches (mm) | 83.78 (2128.11) | 81.81 (2077.85) | -1.98 (-50.27) -2.4% |
| Sidewall Height inches (mm) | 2.83 (72) | 2.52 (64) | -0.31 (-8) -11.1% |
| Revolutions per mile (km) | 756.23 (469.9) | 774.52 (481.27) | 18.29 (11.37) 2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.53 mph (31.43 km/h) |
| 25 mph (40.23 km/h) | 24.41 mph (39.28 km/h) |
| 30 mph (48.28 km/h) | 29.29 mph (47.14 km/h) |
| 35 mph (56.33 km/h) | 34.17 mph (55 km/h) |
| 40 mph (64.37 km/h) | 39.06 mph (62.85 km/h) |
| 45 mph (72.42 km/h) | 43.94 mph (70.71 km/h) |
| 50 mph (80.47 km/h) | 48.82 mph (78.57 km/h) |
| 55 mph (88.51 km/h) | 53.7 mph (86.42 km/h) |
| 60 mph (96.56 km/h) | 58.58 mph (94.28 km/h) |
| 65 mph (104.61 km/h) | 63.46 mph (102.14 km/h) |
| 70 mph (112.65 km/h) | 68.35 mph (109.99 km/h) |
| 75 mph (120.7 km/h) | 73.23 mph (117.85 km/h) |
| 80 mph (128.75 km/h) | 78.11 mph (125.71 km/h) |
| 85 mph (136.79 km/h) | 82.99 mph (133.56 km/h) |
| 90 mph (144.84 km/h) | 87.87 mph (141.42 km/h) |
| 95 mph (152.89 km/h) | 92.76 mph (149.28 km/h) |
| 100 mph (160.93 km/h) | 97.64 mph (157.13 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1971 | 2290 | 2466 | 2575 | 2692 | 2776 | 2868 | 2977 | 3128 | 3279 | 3447 | 3581 | 3825 | 4093 | 4303 | 4437 | 4512 | 4789 | 5175 | 6014 |
Better Fuel Economy Factory Ratios Increased Power
