Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-20 | 355/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.2 (691) | 28.39 (721) | 1.18 (30) 4.3% |
| Width inches (mm) | 12.01 (305) | 13.98 (355) | 1.97 (50) 16.4% |
| Circum. inches (mm) | 85.47 (2170.84) | 89.18 (2265.09) | 3.71 (94.25) 4.3% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 4.19 (106.5) | 0.59 (15) 16.4% |
| Revolutions per mile (km) | 741.35 (460.65) | 710.5 (441.48) | -30.85 (-19.17) -4.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.87 mph (33.58 km/h) |
| 25 mph (40.23 km/h) | 26.09 mph (41.98 km/h) |
| 30 mph (48.28 km/h) | 31.3 mph (50.38 km/h) |
| 35 mph (56.33 km/h) | 36.52 mph (58.77 km/h) |
| 40 mph (64.37 km/h) | 41.74 mph (67.17 km/h) |
| 45 mph (72.42 km/h) | 46.95 mph (75.56 km/h) |
| 50 mph (80.47 km/h) | 52.17 mph (83.96 km/h) |
| 55 mph (88.51 km/h) | 57.39 mph (92.36 km/h) |
| 60 mph (96.56 km/h) | 62.6 mph (100.75 km/h) |
| 65 mph (104.61 km/h) | 67.82 mph (109.15 km/h) |
| 70 mph (112.65 km/h) | 73.04 mph (117.55 km/h) |
| 75 mph (120.7 km/h) | 78.26 mph (125.94 km/h) |
| 80 mph (128.75 km/h) | 83.47 mph (134.34 km/h) |
| 85 mph (136.79 km/h) | 88.69 mph (142.73 km/h) |
| 90 mph (144.84 km/h) | 93.91 mph (151.13 km/h) |
| 95 mph (152.89 km/h) | 99.12 mph (159.53 km/h) |
| 100 mph (160.93 km/h) | 104.34 mph (167.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1808 | 2100 | 2262 | 2362 | 2470 | 2547 | 2631 | 2731 | 2870 | 3008 | 3162 | 3285 | 3508 | 3755 | 3947 | 4070 | 4139 | 4393 | 4747 | 5517 |
Better Fuel Economy Factory Ratios Increased Power
