Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-20 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.74 (755.5) | 29.04 (737.5) | -0.71 (-18) -2.4% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 93.44 (2373.47) | 91.22 (2316.92) | -2.23 (-56.55) -2.4% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 4.52 (114.75) | -0.35 (-9) -7.3% |
| Revolutions per mile (km) | 678.05 (421.32) | 694.6 (431.61) | 16.55 (10.28) 2.4% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.52 mph (31.42 km/h) |
| 25 mph (40.23 km/h) | 24.4 mph (39.28 km/h) |
| 30 mph (48.28 km/h) | 29.29 mph (47.13 km/h) |
| 35 mph (56.33 km/h) | 34.17 mph (54.99 km/h) |
| 40 mph (64.37 km/h) | 39.05 mph (62.84 km/h) |
| 45 mph (72.42 km/h) | 43.93 mph (70.7 km/h) |
| 50 mph (80.47 km/h) | 48.81 mph (78.55 km/h) |
| 55 mph (88.51 km/h) | 53.69 mph (86.41 km/h) |
| 60 mph (96.56 km/h) | 58.57 mph (94.26 km/h) |
| 65 mph (104.61 km/h) | 63.45 mph (102.12 km/h) |
| 70 mph (112.65 km/h) | 68.33 mph (109.97 km/h) |
| 75 mph (120.7 km/h) | 73.21 mph (117.83 km/h) |
| 80 mph (128.75 km/h) | 78.09 mph (125.68 km/h) |
| 85 mph (136.79 km/h) | 82.97 mph (133.54 km/h) |
| 90 mph (144.84 km/h) | 87.86 mph (141.39 km/h) |
| 95 mph (152.89 km/h) | 92.74 mph (149.25 km/h) |
| 100 mph (160.93 km/h) | 97.62 mph (157.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2053 | 2211 | 2309 | 2415 | 2490 | 2572 | 2670 | 2806 | 2941 | 3091 | 3212 | 3430 | 3671 | 3859 | 3979 | 4047 | 4295 | 4641 | 5393 |
Better Fuel Economy Factory Ratios Increased Power
