Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 275/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 28.66 (728) | 0.51 (13) 1.8% |
| Width inches (mm) | 13.58 (345) | 10.83 (275) | -2.76 (-70) -20.3% |
| Circum. inches (mm) | 88.43 (2246.24) | 90.04 (2287.08) | 1.61 (40.84) 1.8% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 4.33 (110) | 0.26 (6.5) 6.3% |
| Revolutions per mile (km) | 716.46 (445.19) | 703.67 (437.24) | -12.79 (-7.95) -1.8% |
275/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.36 mph (32.77 km/h) |
| 25 mph (40.23 km/h) | 25.45 mph (40.97 km/h) |
| 30 mph (48.28 km/h) | 30.55 mph (49.16 km/h) |
| 35 mph (56.33 km/h) | 35.64 mph (57.35 km/h) |
| 40 mph (64.37 km/h) | 40.73 mph (65.54 km/h) |
| 45 mph (72.42 km/h) | 45.82 mph (73.74 km/h) |
| 50 mph (80.47 km/h) | 50.91 mph (81.93 km/h) |
| 55 mph (88.51 km/h) | 56 mph (90.12 km/h) |
| 60 mph (96.56 km/h) | 61.09 mph (98.32 km/h) |
| 65 mph (104.61 km/h) | 66.18 mph (106.51 km/h) |
| 70 mph (112.65 km/h) | 71.27 mph (114.7 km/h) |
| 75 mph (120.7 km/h) | 76.36 mph (122.9 km/h) |
| 80 mph (128.75 km/h) | 81.45 mph (131.09 km/h) |
| 85 mph (136.79 km/h) | 86.55 mph (139.28 km/h) |
| 90 mph (144.84 km/h) | 91.64 mph (147.47 km/h) |
| 95 mph (152.89 km/h) | 96.73 mph (155.67 km/h) |
| 100 mph (160.93 km/h) | 101.82 mph (163.86 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1791 | 2080 | 2240 | 2339 | 2446 | 2522 | 2606 | 2705 | 2842 | 2979 | 3132 | 3254 | 3475 | 3719 | 3909 | 4031 | 4100 | 4351 | 4702 | 5464 |
Better Fuel Economy Factory Ratios Increased Power
