Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 285/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 27.73 (704.4) | 0.24 (6) 0.9% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 86.38 (2194.09) | 87.12 (2212.94) | 0.74 (18.85) 0.9% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 3.37 (85.5) | 0.12 (3) 3.6% |
| Revolutions per mile (km) | 733.49 (455.77) | 727.24 (451.89) | -6.25 (-3.88) -0.9% |
285/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.17 mph (32.46 km/h) |
| 25 mph (40.23 km/h) | 25.21 mph (40.58 km/h) |
| 30 mph (48.28 km/h) | 30.26 mph (48.7 km/h) |
| 35 mph (56.33 km/h) | 35.3 mph (56.81 km/h) |
| 40 mph (64.37 km/h) | 40.34 mph (64.93 km/h) |
| 45 mph (72.42 km/h) | 45.39 mph (73.04 km/h) |
| 50 mph (80.47 km/h) | 50.43 mph (81.16 km/h) |
| 55 mph (88.51 km/h) | 55.47 mph (89.27 km/h) |
| 60 mph (96.56 km/h) | 60.52 mph (97.39 km/h) |
| 65 mph (104.61 km/h) | 65.56 mph (105.51 km/h) |
| 70 mph (112.65 km/h) | 70.6 mph (113.62 km/h) |
| 75 mph (120.7 km/h) | 75.64 mph (121.74 km/h) |
| 80 mph (128.75 km/h) | 80.69 mph (129.85 km/h) |
| 85 mph (136.79 km/h) | 85.73 mph (137.97 km/h) |
| 90 mph (144.84 km/h) | 90.77 mph (146.09 km/h) |
| 95 mph (152.89 km/h) | 95.82 mph (154.2 km/h) |
| 100 mph (160.93 km/h) | 100.86 mph (162.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1851 | 2150 | 2315 | 2418 | 2528 | 2607 | 2693 | 2796 | 2937 | 3079 | 3237 | 3363 | 3591 | 3843 | 4040 | 4166 | 4237 | 4497 | 4859 | 5647 |
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