Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 80/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 27.3 (693.4) | 0.63 (16) 2.4% |
| Width inches (mm) | 3.15 (80) | 3.15 (80) | 0 (0) 0% |
| Circum. inches (mm) | 83.78 (2128.11) | 85.76 (2178.38) | 1.98 (50.27) 2.4% |
| Sidewall Height inches (mm) | 2.83 (72) | 3.15 (80) | 0.31 (8) 11.1% |
| Revolutions per mile (km) | 756.23 (469.9) | 738.78 (459.06) | -17.45 (-10.84) -2.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.47 mph (32.95 km/h) |
| 25 mph (40.23 km/h) | 25.59 mph (41.18 km/h) |
| 30 mph (48.28 km/h) | 30.71 mph (49.42 km/h) |
| 35 mph (56.33 km/h) | 35.83 mph (57.66 km/h) |
| 40 mph (64.37 km/h) | 40.94 mph (65.89 km/h) |
| 45 mph (72.42 km/h) | 46.06 mph (74.13 km/h) |
| 50 mph (80.47 km/h) | 51.18 mph (82.37 km/h) |
| 55 mph (88.51 km/h) | 56.3 mph (90.6 km/h) |
| 60 mph (96.56 km/h) | 61.42 mph (98.84 km/h) |
| 65 mph (104.61 km/h) | 66.54 mph (107.08 km/h) |
| 70 mph (112.65 km/h) | 71.65 mph (115.32 km/h) |
| 75 mph (120.7 km/h) | 76.77 mph (123.55 km/h) |
| 80 mph (128.75 km/h) | 81.89 mph (131.79 km/h) |
| 85 mph (136.79 km/h) | 87.01 mph (140.03 km/h) |
| 90 mph (144.84 km/h) | 92.13 mph (148.26 km/h) |
| 95 mph (152.89 km/h) | 97.24 mph (156.5 km/h) |
| 100 mph (160.93 km/h) | 102.36 mph (164.74 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1880 | 2184 | 2352 | 2456 | 2568 | 2648 | 2736 | 2840 | 2984 | 3128 | 3288 | 3416 | 3648 | 3904 | 4104 | 4232 | 4304 | 4568 | 4936 | 5736 |
Better Fuel Economy Factory Ratios Increased Power
