Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-20 | 305/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.66 (728) | 29.61 (752) | 0.94 (24) 3.3% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 90.04 (2287.08) | 93.01 (2362.48) | 2.97 (75.4) 3.3% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.8 (122) | 0.47 (12) 10.9% |
| Revolutions per mile (km) | 703.67 (437.24) | 681.21 (423.28) | -22.46 (-13.95) -3.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.66 mph (33.25 km/h) |
| 25 mph (40.23 km/h) | 25.82 mph (41.56 km/h) |
| 30 mph (48.28 km/h) | 30.99 mph (49.87 km/h) |
| 35 mph (56.33 km/h) | 36.15 mph (58.18 km/h) |
| 40 mph (64.37 km/h) | 41.32 mph (66.5 km/h) |
| 45 mph (72.42 km/h) | 46.48 mph (74.81 km/h) |
| 50 mph (80.47 km/h) | 51.65 mph (83.12 km/h) |
| 55 mph (88.51 km/h) | 56.81 mph (91.43 km/h) |
| 60 mph (96.56 km/h) | 61.98 mph (99.74 km/h) |
| 65 mph (104.61 km/h) | 67.14 mph (108.06 km/h) |
| 70 mph (112.65 km/h) | 72.31 mph (116.37 km/h) |
| 75 mph (120.7 km/h) | 77.47 mph (124.68 km/h) |
| 80 mph (128.75 km/h) | 82.64 mph (132.99 km/h) |
| 85 mph (136.79 km/h) | 87.8 mph (141.3 km/h) |
| 90 mph (144.84 km/h) | 92.97 mph (149.62 km/h) |
| 95 mph (152.89 km/h) | 98.13 mph (157.93 km/h) |
| 100 mph (160.93 km/h) | 103.3 mph (166.24 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1734 | 2014 | 2169 | 2265 | 2368 | 2442 | 2523 | 2619 | 2752 | 2884 | 3032 | 3150 | 3364 | 3600 | 3784 | 3902 | 3969 | 4212 | 4551 | 5289 |
Better Fuel Economy Factory Ratios Increased Power
