Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.91 (810.5) | 32.01 (813) | 0.1 (2.5) 0.3% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 100.25 (2546.26) | 100.56 (2554.11) | 0.31 (7.85) 0.3% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 6 (152.5) | 0.05 (1.25) 0.8% |
| Revolutions per mile (km) | 632.04 (392.73) | 630.1 (391.52) | -1.94 (-1.21) -0.3% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.06 mph (32.29 km/h) |
| 25 mph (40.23 km/h) | 25.08 mph (40.36 km/h) |
| 30 mph (48.28 km/h) | 30.09 mph (48.43 km/h) |
| 35 mph (56.33 km/h) | 35.11 mph (56.5 km/h) |
| 40 mph (64.37 km/h) | 40.12 mph (64.57 km/h) |
| 45 mph (72.42 km/h) | 45.14 mph (72.64 km/h) |
| 50 mph (80.47 km/h) | 50.15 mph (80.72 km/h) |
| 55 mph (88.51 km/h) | 55.17 mph (88.79 km/h) |
| 60 mph (96.56 km/h) | 60.19 mph (96.86 km/h) |
| 65 mph (104.61 km/h) | 65.2 mph (104.93 km/h) |
| 70 mph (112.65 km/h) | 70.22 mph (113 km/h) |
| 75 mph (120.7 km/h) | 75.23 mph (121.07 km/h) |
| 80 mph (128.75 km/h) | 80.25 mph (129.14 km/h) |
| 85 mph (136.79 km/h) | 85.26 mph (137.22 km/h) |
| 90 mph (144.84 km/h) | 90.28 mph (145.29 km/h) |
| 95 mph (152.89 km/h) | 95.29 mph (153.36 km/h) |
| 100 mph (160.93 km/h) | 100.31 mph (161.43 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1603 | 1863 | 2006 | 2095 | 2190 | 2259 | 2334 | 2422 | 2545 | 2668 | 2804 | 2914 | 3111 | 3330 | 3500 | 3610 | 3671 | 3896 | 4210 | 4892 |
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