Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 90/90-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 27.38 (695.4) | 0.71 (18) 2.7% |
| Width inches (mm) | 3.15 (80) | 3.54 (90) | 0.39 (10) 12.5% |
| Circum. inches (mm) | 83.78 (2128.11) | 86.01 (2184.66) | 2.23 (56.55) 2.7% |
| Sidewall Height inches (mm) | 2.83 (72) | 3.19 (81) | 0.35 (9) 12.5% |
| Revolutions per mile (km) | 756.23 (469.9) | 736.66 (457.74) | -19.57 (-12.16) -2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.53 mph (33.04 km/h) |
| 25 mph (40.23 km/h) | 25.66 mph (41.3 km/h) |
| 30 mph (48.28 km/h) | 30.8 mph (49.56 km/h) |
| 35 mph (56.33 km/h) | 35.93 mph (57.82 km/h) |
| 40 mph (64.37 km/h) | 41.06 mph (66.08 km/h) |
| 45 mph (72.42 km/h) | 46.2 mph (74.34 km/h) |
| 50 mph (80.47 km/h) | 51.33 mph (82.61 km/h) |
| 55 mph (88.51 km/h) | 56.46 mph (90.87 km/h) |
| 60 mph (96.56 km/h) | 61.59 mph (99.13 km/h) |
| 65 mph (104.61 km/h) | 66.73 mph (107.39 km/h) |
| 70 mph (112.65 km/h) | 71.86 mph (115.65 km/h) |
| 75 mph (120.7 km/h) | 76.99 mph (123.91 km/h) |
| 80 mph (128.75 km/h) | 82.13 mph (132.17 km/h) |
| 85 mph (136.79 km/h) | 87.26 mph (140.43 km/h) |
| 90 mph (144.84 km/h) | 92.39 mph (148.69 km/h) |
| 95 mph (152.89 km/h) | 97.52 mph (156.95 km/h) |
| 100 mph (160.93 km/h) | 102.66 mph (165.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1875 | 2178 | 2345 | 2449 | 2561 | 2640 | 2728 | 2832 | 2976 | 3119 | 3279 | 3406 | 3638 | 3893 | 4092 | 4220 | 4292 | 4555 | 4922 | 5720 |
Better Fuel Economy Factory Ratios Increased Power
