Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/85-16 | 235/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.71 (703.9) | 27.4 (696) | -0.31 (-7.9) -1.1% |
| Width inches (mm) | 6.89 (175) | 9.25 (235) | 2.36 (60) 34.3% |
| Circum. inches (mm) | 87.06 (2211.37) | 86.08 (2186.55) | -0.98 (-24.82) -1.1% |
| Sidewall Height inches (mm) | 5.86 (148.75) | 3.7 (94) | -2.16 (-54.75) -36.8% |
| Revolutions per mile (km) | 727.76 (452.21) | 736.02 (457.34) | 8.26 (5.13) 1.1% |
235/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.78 mph (31.83 km/h) |
| 25 mph (40.23 km/h) | 24.72 mph (39.78 km/h) |
| 30 mph (48.28 km/h) | 29.66 mph (47.74 km/h) |
| 35 mph (56.33 km/h) | 34.61 mph (55.69 km/h) |
| 40 mph (64.37 km/h) | 39.55 mph (63.65 km/h) |
| 45 mph (72.42 km/h) | 44.49 mph (71.61 km/h) |
| 50 mph (80.47 km/h) | 49.44 mph (79.56 km/h) |
| 55 mph (88.51 km/h) | 54.38 mph (87.52 km/h) |
| 60 mph (96.56 km/h) | 59.33 mph (95.48 km/h) |
| 65 mph (104.61 km/h) | 64.27 mph (103.43 km/h) |
| 70 mph (112.65 km/h) | 69.21 mph (111.39 km/h) |
| 75 mph (120.7 km/h) | 74.16 mph (119.35 km/h) |
| 80 mph (128.75 km/h) | 79.1 mph (127.3 km/h) |
| 85 mph (136.79 km/h) | 84.05 mph (135.26 km/h) |
| 90 mph (144.84 km/h) | 88.99 mph (143.22 km/h) |
| 95 mph (152.89 km/h) | 93.93 mph (151.17 km/h) |
| 100 mph (160.93 km/h) | 98.88 mph (159.13 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1873 | 2176 | 2343 | 2447 | 2558 | 2638 | 2726 | 2829 | 2973 | 3116 | 3276 | 3403 | 3634 | 3890 | 4089 | 4216 | 4288 | 4551 | 4918 | 5715 |
Better Fuel Economy Factory Ratios Increased Power
