Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/80-17 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.39 (695.8) | 29.04 (737.5) | 1.64 (41.7) 6% |
| Width inches (mm) | 6.5 (165) | 10.04 (255) | 3.54 (90) 54.5% |
| Circum. inches (mm) | 86.06 (2185.92) | 91.22 (2316.92) | 5.16 (131) 6% |
| Sidewall Height inches (mm) | 5.2 (132) | 4.52 (114.75) | -0.68 (-17.25) -13.1% |
| Revolutions per mile (km) | 736.23 (457.47) | 694.6 (431.61) | -41.63 (-25.87) -5.7% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.2 mph (34.12 km/h) |
| 25 mph (40.23 km/h) | 26.5 mph (42.64 km/h) |
| 30 mph (48.28 km/h) | 31.8 mph (51.17 km/h) |
| 35 mph (56.33 km/h) | 37.1 mph (59.7 km/h) |
| 40 mph (64.37 km/h) | 42.4 mph (68.23 km/h) |
| 45 mph (72.42 km/h) | 47.7 mph (76.76 km/h) |
| 50 mph (80.47 km/h) | 53 mph (85.29 km/h) |
| 55 mph (88.51 km/h) | 58.3 mph (93.82 km/h) |
| 60 mph (96.56 km/h) | 63.6 mph (102.35 km/h) |
| 65 mph (104.61 km/h) | 68.9 mph (110.88 km/h) |
| 70 mph (112.65 km/h) | 74.2 mph (119.41 km/h) |
| 75 mph (120.7 km/h) | 79.49 mph (127.93 km/h) |
| 80 mph (128.75 km/h) | 84.79 mph (136.46 km/h) |
| 85 mph (136.79 km/h) | 90.09 mph (144.99 km/h) |
| 90 mph (144.84 km/h) | 95.39 mph (153.52 km/h) |
| 95 mph (152.89 km/h) | 100.69 mph (162.05 km/h) |
| 100 mph (160.93 km/h) | 105.99 mph (170.58 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
