Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-18 | 275/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.54 (674.2) | 28.66 (728) | 2.12 (53.8) 8% |
| Width inches (mm) | 6.1 (155) | 10.83 (275) | 4.72 (120) 77.4% |
| Circum. inches (mm) | 83.39 (2118.06) | 90.04 (2287.08) | 6.65 (169.02) 8% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 4.33 (110) | 0.06 (1.5) 1.4% |
| Revolutions per mile (km) | 759.82 (472.13) | 703.67 (437.24) | -56.15 (-34.89) -7.4% |
275/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.6 mph (34.76 km/h) |
| 25 mph (40.23 km/h) | 26.99 mph (43.44 km/h) |
| 30 mph (48.28 km/h) | 32.39 mph (52.13 km/h) |
| 35 mph (56.33 km/h) | 37.79 mph (60.82 km/h) |
| 40 mph (64.37 km/h) | 43.19 mph (69.51 km/h) |
| 45 mph (72.42 km/h) | 48.59 mph (78.2 km/h) |
| 50 mph (80.47 km/h) | 53.99 mph (86.89 km/h) |
| 55 mph (88.51 km/h) | 59.39 mph (95.58 km/h) |
| 60 mph (96.56 km/h) | 64.79 mph (104.27 km/h) |
| 65 mph (104.61 km/h) | 70.19 mph (112.96 km/h) |
| 70 mph (112.65 km/h) | 75.59 mph (121.64 km/h) |
| 75 mph (120.7 km/h) | 80.98 mph (130.33 km/h) |
| 80 mph (128.75 km/h) | 86.38 mph (139.02 km/h) |
| 85 mph (136.79 km/h) | 91.78 mph (147.71 km/h) |
| 90 mph (144.84 km/h) | 97.18 mph (156.4 km/h) |
| 95 mph (152.89 km/h) | 102.58 mph (165.09 km/h) |
| 100 mph (160.93 km/h) | 107.98 mph (173.78 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
