Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 345/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 34.94 (887.5) | 6.79 (172.5) 24.1% |
| Width inches (mm) | 13.58 (345) | 13.58 (345) | 0 (0) 0% |
| Circum. inches (mm) | 88.43 (2246.24) | 109.77 (2788.16) | 21.34 (541.92) 24.1% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 7.47 (189.75) | 3.4 (86.25) 83.3% |
| Revolutions per mile (km) | 716.46 (445.19) | 577.21 (358.66) | -139.26 (-86.53) -19.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.83 mph (39.95 km/h) |
| 25 mph (40.23 km/h) | 31.03 mph (49.94 km/h) |
| 30 mph (48.28 km/h) | 37.24 mph (59.93 km/h) |
| 35 mph (56.33 km/h) | 43.44 mph (69.92 km/h) |
| 40 mph (64.37 km/h) | 49.65 mph (79.9 km/h) |
| 45 mph (72.42 km/h) | 55.86 mph (89.89 km/h) |
| 50 mph (80.47 km/h) | 62.06 mph (99.88 km/h) |
| 55 mph (88.51 km/h) | 68.27 mph (109.87 km/h) |
| 60 mph (96.56 km/h) | 74.48 mph (119.86 km/h) |
| 65 mph (104.61 km/h) | 80.68 mph (129.85 km/h) |
| 70 mph (112.65 km/h) | 86.89 mph (139.83 km/h) |
| 75 mph (120.7 km/h) | 93.09 mph (149.82 km/h) |
| 80 mph (128.75 km/h) | 99.3 mph (159.81 km/h) |
| 85 mph (136.79 km/h) | 105.51 mph (169.8 km/h) |
| 90 mph (144.84 km/h) | 111.71 mph (179.79 km/h) |
| 95 mph (152.89 km/h) | 117.92 mph (189.77 km/h) |
| 100 mph (160.93 km/h) | 124.13 mph (199.76 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1469 | 1706 | 1838 | 1919 | 2006 | 2069 | 2138 | 2219 | 2331 | 2444 | 2569 | 2669 | 2850 | 3050 | 3207 | 3307 | 3363 | 3569 | 3857 | 4482 |
Better Fuel Economy Factory Ratios Increased Power
