Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/50-20 | 305/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.01 (813) | 29.61 (752) | -2.4 (-61) -7.5% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 100.56 (2554.11) | 93.01 (2362.48) | -7.54 (-191.64) -7.5% |
| Sidewall Height inches (mm) | 6 (152.5) | 4.8 (122) | -1.2 (-30.5) -20% |
| Revolutions per mile (km) | 630.1 (391.52) | 681.21 (423.28) | 51.11 (31.76) 8.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.5 mph (29.77 km/h) |
| 25 mph (40.23 km/h) | 23.12 mph (37.21 km/h) |
| 30 mph (48.28 km/h) | 27.75 mph (44.66 km/h) |
| 35 mph (56.33 km/h) | 32.37 mph (52.1 km/h) |
| 40 mph (64.37 km/h) | 37 mph (59.54 km/h) |
| 45 mph (72.42 km/h) | 41.62 mph (66.99 km/h) |
| 50 mph (80.47 km/h) | 46.25 mph (74.43 km/h) |
| 55 mph (88.51 km/h) | 50.87 mph (81.87 km/h) |
| 60 mph (96.56 km/h) | 55.5 mph (89.32 km/h) |
| 65 mph (104.61 km/h) | 60.12 mph (96.76 km/h) |
| 70 mph (112.65 km/h) | 64.75 mph (104.2 km/h) |
| 75 mph (120.7 km/h) | 69.37 mph (111.64 km/h) |
| 80 mph (128.75 km/h) | 74 mph (119.09 km/h) |
| 85 mph (136.79 km/h) | 78.62 mph (126.53 km/h) |
| 90 mph (144.84 km/h) | 83.25 mph (133.97 km/h) |
| 95 mph (152.89 km/h) | 87.87 mph (141.42 km/h) |
| 100 mph (160.93 km/h) | 92.5 mph (148.86 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1734 | 2014 | 2169 | 2265 | 2368 | 2442 | 2523 | 2619 | 2752 | 2884 | 3032 | 3150 | 3364 | 3600 | 3784 | 3902 | 3969 | 4212 | 4551 | 5289 |
Better Fuel Economy Factory Ratios Increased Power
