Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/30-21 | 285/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.4) | 28.98 (736) | 1.01 (25.6) 3.6% |
| Width inches (mm) | 11.61 (295) | 11.22 (285) | -0.39 (-10) -3.4% |
| Circum. inches (mm) | 87.87 (2231.79) | 91.03 (2312.21) | 3.17 (80.42) 3.6% |
| Sidewall Height inches (mm) | 3.48 (88.5) | 4.49 (114) | 1 (25.5) 28.8% |
| Revolutions per mile (km) | 721.1 (448.07) | 696.02 (432.49) | -25.08 (-15.59) -3.5% |
285/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.72 mph (33.35 km/h) |
| 25 mph (40.23 km/h) | 25.9 mph (41.68 km/h) |
| 30 mph (48.28 km/h) | 31.08 mph (50.02 km/h) |
| 35 mph (56.33 km/h) | 36.26 mph (58.36 km/h) |
| 40 mph (64.37 km/h) | 41.44 mph (66.69 km/h) |
| 45 mph (72.42 km/h) | 46.62 mph (75.03 km/h) |
| 50 mph (80.47 km/h) | 51.8 mph (83.37 km/h) |
| 55 mph (88.51 km/h) | 56.98 mph (91.7 km/h) |
| 60 mph (96.56 km/h) | 62.16 mph (100.04 km/h) |
| 65 mph (104.61 km/h) | 67.34 mph (108.38 km/h) |
| 70 mph (112.65 km/h) | 72.52 mph (116.71 km/h) |
| 75 mph (120.7 km/h) | 77.7 mph (125.05 km/h) |
| 80 mph (128.75 km/h) | 82.88 mph (133.39 km/h) |
| 85 mph (136.79 km/h) | 88.06 mph (141.72 km/h) |
| 90 mph (144.84 km/h) | 93.24 mph (150.06 km/h) |
| 95 mph (152.89 km/h) | 98.42 mph (158.4 km/h) |
| 100 mph (160.93 km/h) | 103.6 mph (166.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1771 | 2058 | 2216 | 2314 | 2419 | 2495 | 2578 | 2676 | 2811 | 2947 | 3098 | 3218 | 3437 | 3678 | 3867 | 3987 | 4055 | 4304 | 4650 | 5404 |
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