Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 275/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 29.74 (755.5) | 0.14 (3.5) 0.5% |
| Width inches (mm) | 12.01 (305) | 10.83 (275) | -1.18 (-30) -9.8% |
| Circum. inches (mm) | 93.01 (2362.48) | 93.44 (2373.47) | 0.43 (11) 0.5% |
| Sidewall Height inches (mm) | 4.8 (122) | 4.87 (123.75) | 0.07 (1.75) 1.4% |
| Revolutions per mile (km) | 681.21 (423.28) | 678.05 (421.32) | -3.16 (-1.96) -0.5% |
275/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.09 mph (32.34 km/h) |
| 25 mph (40.23 km/h) | 25.12 mph (40.42 km/h) |
| 30 mph (48.28 km/h) | 30.14 mph (48.51 km/h) |
| 35 mph (56.33 km/h) | 35.16 mph (56.59 km/h) |
| 40 mph (64.37 km/h) | 40.19 mph (64.67 km/h) |
| 45 mph (72.42 km/h) | 45.21 mph (72.76 km/h) |
| 50 mph (80.47 km/h) | 50.23 mph (80.84 km/h) |
| 55 mph (88.51 km/h) | 55.26 mph (88.93 km/h) |
| 60 mph (96.56 km/h) | 60.28 mph (97.01 km/h) |
| 65 mph (104.61 km/h) | 65.3 mph (105.09 km/h) |
| 70 mph (112.65 km/h) | 70.33 mph (113.18 km/h) |
| 75 mph (120.7 km/h) | 75.35 mph (121.26 km/h) |
| 80 mph (128.75 km/h) | 80.37 mph (129.35 km/h) |
| 85 mph (136.79 km/h) | 85.4 mph (137.43 km/h) |
| 90 mph (144.84 km/h) | 90.42 mph (145.52 km/h) |
| 95 mph (152.89 km/h) | 95.44 mph (153.6 km/h) |
| 100 mph (160.93 km/h) | 100.47 mph (161.68 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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