Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 90/90-21 | 120/70-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.38 (695.4) | 25.61 (650.6) | -1.76 (-44.8) -6.4% |
| Width inches (mm) | 3.54 (90) | 4.72 (120) | 1.18 (30) 33.3% |
| Circum. inches (mm) | 86.01 (2184.66) | 80.47 (2043.92) | -5.54 (-140.74) -6.4% |
| Sidewall Height inches (mm) | 3.19 (81) | 3.31 (84) | 0.12 (3) 3.7% |
| Revolutions per mile (km) | 736.66 (457.74) | 787.38 (489.25) | 50.73 (31.52) 6.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.71 mph (30.11 km/h) |
| 25 mph (40.23 km/h) | 23.39 mph (37.64 km/h) |
| 30 mph (48.28 km/h) | 28.07 mph (45.17 km/h) |
| 35 mph (56.33 km/h) | 32.75 mph (52.7 km/h) |
| 40 mph (64.37 km/h) | 37.42 mph (60.23 km/h) |
| 45 mph (72.42 km/h) | 42.1 mph (67.76 km/h) |
| 50 mph (80.47 km/h) | 46.78 mph (75.28 km/h) |
| 55 mph (88.51 km/h) | 51.46 mph (82.81 km/h) |
| 60 mph (96.56 km/h) | 56.13 mph (90.34 km/h) |
| 65 mph (104.61 km/h) | 60.81 mph (97.87 km/h) |
| 70 mph (112.65 km/h) | 65.49 mph (105.4 km/h) |
| 75 mph (120.7 km/h) | 70.17 mph (112.93 km/h) |
| 80 mph (128.75 km/h) | 74.85 mph (120.45 km/h) |
| 85 mph (136.79 km/h) | 79.52 mph (127.98 km/h) |
| 90 mph (144.84 km/h) | 84.2 mph (135.51 km/h) |
| 95 mph (152.89 km/h) | 88.88 mph (143.04 km/h) |
| 100 mph (160.93 km/h) | 93.56 mph (150.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2004 | 2328 | 2507 | 2618 | 2737 | 2822 | 2916 | 3027 | 3180 | 3334 | 3504 | 3641 | 3888 | 4161 | 4374 | 4511 | 4587 | 4869 | 5261 | 6114 |
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