Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-20 | 235/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.91 (810.5) | 28.33 (719.5) | -3.58 (-91) -11.2% |
| Width inches (mm) | 10.83 (275) | 9.25 (235) | -1.57 (-40) -14.5% |
| Circum. inches (mm) | 100.25 (2546.26) | 88.99 (2260.38) | -11.26 (-285.88) -11.2% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 4.16 (105.75) | -1.79 (-45.5) -30.1% |
| Revolutions per mile (km) | 632.04 (392.73) | 711.98 (442.4) | 79.94 (49.67) 12.6% |
235/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.75 mph (28.57 km/h) |
| 25 mph (40.23 km/h) | 22.19 mph (35.72 km/h) |
| 30 mph (48.28 km/h) | 26.63 mph (42.86 km/h) |
| 35 mph (56.33 km/h) | 31.07 mph (50 km/h) |
| 40 mph (64.37 km/h) | 35.51 mph (57.15 km/h) |
| 45 mph (72.42 km/h) | 39.95 mph (64.29 km/h) |
| 50 mph (80.47 km/h) | 44.39 mph (71.43 km/h) |
| 55 mph (88.51 km/h) | 48.82 mph (78.58 km/h) |
| 60 mph (96.56 km/h) | 53.26 mph (85.72 km/h) |
| 65 mph (104.61 km/h) | 57.7 mph (92.86 km/h) |
| 70 mph (112.65 km/h) | 62.14 mph (100.01 km/h) |
| 75 mph (120.7 km/h) | 66.58 mph (107.15 km/h) |
| 80 mph (128.75 km/h) | 71.02 mph (114.29 km/h) |
| 85 mph (136.79 km/h) | 75.46 mph (121.44 km/h) |
| 90 mph (144.84 km/h) | 79.9 mph (128.58 km/h) |
| 95 mph (152.89 km/h) | 84.33 mph (135.72 km/h) |
| 100 mph (160.93 km/h) | 88.77 mph (142.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1812 | 2105 | 2267 | 2367 | 2475 | 2552 | 2637 | 2737 | 2876 | 3015 | 3169 | 3292 | 3516 | 3762 | 3955 | 4079 | 4148 | 4402 | 4757 | 5528 |
Better Fuel Economy Factory Ratios Increased Power
