Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 275/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 29.74 (755.5) | 2.28 (57.8) 8.3% |
| Width inches (mm) | 7.28 (185) | 10.83 (275) | 3.54 (90) 48.6% |
| Circum. inches (mm) | 86.29 (2191.89) | 93.44 (2373.47) | 7.15 (181.58) 8.3% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 4.87 (123.75) | 0.14 (3.5) 2.9% |
| Revolutions per mile (km) | 734.23 (456.23) | 678.05 (421.32) | -56.17 (-34.9) -7.7% |
275/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.66 mph (34.85 km/h) |
| 25 mph (40.23 km/h) | 27.07 mph (43.57 km/h) |
| 30 mph (48.28 km/h) | 32.49 mph (52.28 km/h) |
| 35 mph (56.33 km/h) | 37.9 mph (60.99 km/h) |
| 40 mph (64.37 km/h) | 43.31 mph (69.71 km/h) |
| 45 mph (72.42 km/h) | 48.73 mph (78.42 km/h) |
| 50 mph (80.47 km/h) | 54.14 mph (87.13 km/h) |
| 55 mph (88.51 km/h) | 59.56 mph (95.85 km/h) |
| 60 mph (96.56 km/h) | 64.97 mph (104.56 km/h) |
| 65 mph (104.61 km/h) | 70.38 mph (113.27 km/h) |
| 70 mph (112.65 km/h) | 75.8 mph (121.99 km/h) |
| 75 mph (120.7 km/h) | 81.21 mph (130.7 km/h) |
| 80 mph (128.75 km/h) | 86.63 mph (139.41 km/h) |
| 85 mph (136.79 km/h) | 92.04 mph (148.13 km/h) |
| 90 mph (144.84 km/h) | 97.46 mph (156.84 km/h) |
| 95 mph (152.89 km/h) | 102.87 mph (165.55 km/h) |
| 100 mph (160.93 km/h) | 108.28 mph (174.27 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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