Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/100-21 | 80/90-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.3 (693.4) | 26.67 (677.4) | -0.63 (-16) -2.3% |
| Width inches (mm) | 3.15 (80) | 3.15 (80) | 0 (0) 0% |
| Circum. inches (mm) | 85.76 (2178.38) | 83.78 (2128.11) | -1.98 (-50.27) -2.3% |
| Sidewall Height inches (mm) | 3.15 (80) | 2.83 (72) | -0.31 (-8) -10% |
| Revolutions per mile (km) | 738.78 (459.06) | 756.23 (469.9) | 17.45 (10.84) 2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.54 mph (31.44 km/h) |
| 25 mph (40.23 km/h) | 24.42 mph (39.31 km/h) |
| 30 mph (48.28 km/h) | 29.31 mph (47.17 km/h) |
| 35 mph (56.33 km/h) | 34.19 mph (55.03 km/h) |
| 40 mph (64.37 km/h) | 39.08 mph (62.89 km/h) |
| 45 mph (72.42 km/h) | 43.96 mph (70.75 km/h) |
| 50 mph (80.47 km/h) | 48.85 mph (78.61 km/h) |
| 55 mph (88.51 km/h) | 53.73 mph (86.47 km/h) |
| 60 mph (96.56 km/h) | 58.62 mph (94.33 km/h) |
| 65 mph (104.61 km/h) | 63.5 mph (102.19 km/h) |
| 70 mph (112.65 km/h) | 68.38 mph (110.05 km/h) |
| 75 mph (120.7 km/h) | 73.27 mph (117.92 km/h) |
| 80 mph (128.75 km/h) | 78.15 mph (125.78 km/h) |
| 85 mph (136.79 km/h) | 83.04 mph (133.64 km/h) |
| 90 mph (144.84 km/h) | 87.92 mph (141.5 km/h) |
| 95 mph (152.89 km/h) | 92.81 mph (149.36 km/h) |
| 100 mph (160.93 km/h) | 97.69 mph (157.22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1924 | 2236 | 2408 | 2514 | 2629 | 2711 | 2801 | 2907 | 3055 | 3202 | 3366 | 3497 | 3734 | 3996 | 4201 | 4332 | 4406 | 4676 | 5053 | 5872 |
Better Fuel Economy Factory Ratios Increased Power
