Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.2 (691) | 32.01 (813) | 4.8 (122) 17.7% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 85.47 (2170.84) | 100.56 (2554.11) | 15.09 (383.27) 17.7% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 6 (152.5) | 2.4 (61) 66.7% |
| Revolutions per mile (km) | 741.35 (460.65) | 630.1 (391.52) | -111.25 (-69.13) -15% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.53 mph (37.87 km/h) |
| 25 mph (40.23 km/h) | 29.41 mph (47.34 km/h) |
| 30 mph (48.28 km/h) | 35.3 mph (56.8 km/h) |
| 35 mph (56.33 km/h) | 41.18 mph (66.27 km/h) |
| 40 mph (64.37 km/h) | 47.06 mph (75.74 km/h) |
| 45 mph (72.42 km/h) | 52.95 mph (85.21 km/h) |
| 50 mph (80.47 km/h) | 58.83 mph (94.67 km/h) |
| 55 mph (88.51 km/h) | 64.71 mph (104.14 km/h) |
| 60 mph (96.56 km/h) | 70.59 mph (113.61 km/h) |
| 65 mph (104.61 km/h) | 76.48 mph (123.08 km/h) |
| 70 mph (112.65 km/h) | 82.36 mph (132.54 km/h) |
| 75 mph (120.7 km/h) | 88.24 mph (142.01 km/h) |
| 80 mph (128.75 km/h) | 94.12 mph (151.48 km/h) |
| 85 mph (136.79 km/h) | 100.01 mph (160.95 km/h) |
| 90 mph (144.84 km/h) | 105.89 mph (170.41 km/h) |
| 95 mph (152.89 km/h) | 111.77 mph (179.88 km/h) |
| 100 mph (160.93 km/h) | 117.66 mph (189.35 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 |
Better Fuel Economy Factory Ratios Increased Power
