Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 32.01 (813) | 2.4 (61) 8.1% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 93.01 (2362.48) | 100.56 (2554.11) | 7.54 (191.64) 8.1% |
| Sidewall Height inches (mm) | 4.8 (122) | 6 (152.5) | 1.2 (30.5) 25% |
| Revolutions per mile (km) | 681.21 (423.28) | 630.1 (391.52) | -51.11 (-31.76) -7.5% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.62 mph (34.8 km/h) |
| 25 mph (40.23 km/h) | 27.03 mph (43.5 km/h) |
| 30 mph (48.28 km/h) | 32.43 mph (52.2 km/h) |
| 35 mph (56.33 km/h) | 37.84 mph (60.9 km/h) |
| 40 mph (64.37 km/h) | 43.24 mph (69.6 km/h) |
| 45 mph (72.42 km/h) | 48.65 mph (78.3 km/h) |
| 50 mph (80.47 km/h) | 54.06 mph (86.99 km/h) |
| 55 mph (88.51 km/h) | 59.46 mph (95.69 km/h) |
| 60 mph (96.56 km/h) | 64.87 mph (104.39 km/h) |
| 65 mph (104.61 km/h) | 70.27 mph (113.09 km/h) |
| 70 mph (112.65 km/h) | 75.68 mph (121.79 km/h) |
| 75 mph (120.7 km/h) | 81.08 mph (130.49 km/h) |
| 80 mph (128.75 km/h) | 86.49 mph (139.19 km/h) |
| 85 mph (136.79 km/h) | 91.89 mph (147.89 km/h) |
| 90 mph (144.84 km/h) | 97.3 mph (156.59 km/h) |
| 95 mph (152.89 km/h) | 102.71 mph (165.29 km/h) |
| 100 mph (160.93 km/h) | 108.11 mph (173.99 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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