Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 100/90-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 26.09 (662.6) | -0.58 (-14.8) -2.2% |
| Width inches (mm) | 3.15 (80) | 3.94 (100) | 0.79 (20) 25% |
| Circum. inches (mm) | 83.78 (2128.11) | 81.95 (2081.62) | -1.83 (-46.5) -2.2% |
| Sidewall Height inches (mm) | 2.83 (72) | 3.54 (90) | 0.71 (18) 25% |
| Revolutions per mile (km) | 756.23 (469.9) | 773.12 (480.39) | 16.89 (10.5) 2.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.56 mph (31.48 km/h) |
| 25 mph (40.23 km/h) | 24.45 mph (39.35 km/h) |
| 30 mph (48.28 km/h) | 29.34 mph (47.23 km/h) |
| 35 mph (56.33 km/h) | 34.24 mph (55.1 km/h) |
| 40 mph (64.37 km/h) | 39.13 mph (62.97 km/h) |
| 45 mph (72.42 km/h) | 44.02 mph (70.84 km/h) |
| 50 mph (80.47 km/h) | 48.91 mph (78.71 km/h) |
| 55 mph (88.51 km/h) | 53.8 mph (86.58 km/h) |
| 60 mph (96.56 km/h) | 58.69 mph (94.45 km/h) |
| 65 mph (104.61 km/h) | 63.58 mph (102.32 km/h) |
| 70 mph (112.65 km/h) | 68.47 mph (110.19 km/h) |
| 75 mph (120.7 km/h) | 73.36 mph (118.06 km/h) |
| 80 mph (128.75 km/h) | 78.25 mph (125.93 km/h) |
| 85 mph (136.79 km/h) | 83.14 mph (133.81 km/h) |
| 90 mph (144.84 km/h) | 88.03 mph (141.68 km/h) |
| 95 mph (152.89 km/h) | 92.92 mph (149.55 km/h) |
| 100 mph (160.93 km/h) | 97.82 mph (157.42 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1967 | 2286 | 2461 | 2570 | 2687 | 2771 | 2863 | 2972 | 3123 | 3273 | 3441 | 3575 | 3818 | 4086 | 4295 | 4429 | 4504 | 4780 | 5166 | 6003 |
Better Fuel Economy Factory Ratios Increased Power
