Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-20 | 275/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736) | 29.74 (755.5) | 0.77 (19.5) 2.6% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 91.03 (2312.21) | 93.44 (2373.47) | 2.41 (61.26) 2.6% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.87 (123.75) | 0.38 (9.75) 8.6% |
| Revolutions per mile (km) | 696.02 (432.49) | 678.05 (421.32) | -17.96 (-11.16) -2.6% |
275/45-20 Tires
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) | 30.79 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) | 46.19 mph (74.34 km/h) |
| 50 mph (80.47 km/h) | 51.32 mph (82.6 km/h) |
| 55 mph (88.51 km/h) | 56.46 mph (90.86 km/h) |
| 60 mph (96.56 km/h) | 61.59 mph (99.12 km/h) |
| 65 mph (104.61 km/h) | 66.72 mph (107.38 km/h) |
| 70 mph (112.65 km/h) | 71.85 mph (115.64 km/h) |
| 75 mph (120.7 km/h) | 76.99 mph (123.9 km/h) |
| 80 mph (128.75 km/h) | 82.12 mph (132.16 km/h) |
| 85 mph (136.79 km/h) | 87.25 mph (140.42 km/h) |
| 90 mph (144.84 km/h) | 92.38 mph (148.68 km/h) |
| 95 mph (152.89 km/h) | 97.52 mph (156.94 km/h) |
| 100 mph (160.93 km/h) | 102.65 mph (165.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1726 | 2005 | 2159 | 2254 | 2357 | 2430 | 2511 | 2607 | 2739 | 2871 | 3018 | 3135 | 3348 | 3583 | 3767 | 3884 | 3950 | 4193 | 4530 | 5265 |
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