Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/65-17 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.03 (737.3) | 29.04 (737.5) | 0.01 (0.2) 0% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 91.19 (2316.3) | 91.22 (2316.92) | 0.02 (0.63) 0% |
| Sidewall Height inches (mm) | 6.01 (152.75) | 4.52 (114.75) | -1.5 (-38) -24.9% |
| Revolutions per mile (km) | 694.79 (431.72) | 694.6 (431.61) | -0.19 (-0.12) -0% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.01 mph (32.2 km/h) |
| 25 mph (40.23 km/h) | 25.01 mph (40.24 km/h) |
| 30 mph (48.28 km/h) | 30.01 mph (48.29 km/h) |
| 35 mph (56.33 km/h) | 35.01 mph (56.34 km/h) |
| 40 mph (64.37 km/h) | 40.01 mph (64.39 km/h) |
| 45 mph (72.42 km/h) | 45.01 mph (72.44 km/h) |
| 50 mph (80.47 km/h) | 50.01 mph (80.49 km/h) |
| 55 mph (88.51 km/h) | 55.01 mph (88.54 km/h) |
| 60 mph (96.56 km/h) | 60.02 mph (96.59 km/h) |
| 65 mph (104.61 km/h) | 65.02 mph (104.64 km/h) |
| 70 mph (112.65 km/h) | 70.02 mph (112.68 km/h) |
| 75 mph (120.7 km/h) | 75.02 mph (120.73 km/h) |
| 80 mph (128.75 km/h) | 80.02 mph (128.78 km/h) |
| 85 mph (136.79 km/h) | 85.02 mph (136.83 km/h) |
| 90 mph (144.84 km/h) | 90.02 mph (144.88 km/h) |
| 95 mph (152.89 km/h) | 95.03 mph (152.93 km/h) |
| 100 mph (160.93 km/h) | 100.03 mph (160.98 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
