Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/100-21 | 90/100-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.3 (693.4) | 28.09 (713.4) | 0.79 (20) 2.9% |
| Width inches (mm) | 3.15 (80) | 3.54 (90) | 0.39 (10) 12.5% |
| Circum. inches (mm) | 85.76 (2178.38) | 88.24 (2241.21) | 2.47 (62.83) 2.9% |
| Sidewall Height inches (mm) | 3.15 (80) | 3.54 (90) | 0.39 (10) 12.5% |
| Revolutions per mile (km) | 738.78 (459.06) | 718.07 (446.19) | -20.71 (-12.87) -2.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.58 mph (33.12 km/h) |
| 25 mph (40.23 km/h) | 25.72 mph (41.39 km/h) |
| 30 mph (48.28 km/h) | 30.87 mph (49.67 km/h) |
| 35 mph (56.33 km/h) | 36.01 mph (57.95 km/h) |
| 40 mph (64.37 km/h) | 41.15 mph (66.23 km/h) |
| 45 mph (72.42 km/h) | 46.3 mph (74.51 km/h) |
| 50 mph (80.47 km/h) | 51.44 mph (82.79 km/h) |
| 55 mph (88.51 km/h) | 56.59 mph (91.07 km/h) |
| 60 mph (96.56 km/h) | 61.73 mph (99.35 km/h) |
| 65 mph (104.61 km/h) | 66.87 mph (107.62 km/h) |
| 70 mph (112.65 km/h) | 72.02 mph (115.9 km/h) |
| 75 mph (120.7 km/h) | 77.16 mph (124.18 km/h) |
| 80 mph (128.75 km/h) | 82.31 mph (132.46 km/h) |
| 85 mph (136.79 km/h) | 87.45 mph (140.74 km/h) |
| 90 mph (144.84 km/h) | 92.6 mph (149.02 km/h) |
| 95 mph (152.89 km/h) | 97.74 mph (157.3 km/h) |
| 100 mph (160.93 km/h) | 102.88 mph (165.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1827 | 2123 | 2286 | 2387 | 2496 | 2574 | 2659 | 2760 | 2900 | 3040 | 3196 | 3320 | 3546 | 3795 | 3989 | 4113 | 4183 | 4440 | 4798 | 5575 |
Better Fuel Economy Factory Ratios Increased Power
