Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/35-20 | 255/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 28.03 (712) | 1.83 (46.5) 7% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 82.31 (2090.73) | 88.06 (2236.81) | 5.75 (146.08) 7% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 4.02 (102) | 0.92 (23.25) 29.5% |
| Revolutions per mile (km) | 769.75 (478.3) | 719.48 (447.06) | -50.27 (-31.24) -6.5% |
255/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.4 mph (34.44 km/h) |
| 25 mph (40.23 km/h) | 26.75 mph (43.04 km/h) |
| 30 mph (48.28 km/h) | 32.1 mph (51.65 km/h) |
| 35 mph (56.33 km/h) | 37.45 mph (60.26 km/h) |
| 40 mph (64.37 km/h) | 42.79 mph (68.87 km/h) |
| 45 mph (72.42 km/h) | 48.14 mph (77.48 km/h) |
| 50 mph (80.47 km/h) | 53.49 mph (86.09 km/h) |
| 55 mph (88.51 km/h) | 58.84 mph (94.7 km/h) |
| 60 mph (96.56 km/h) | 64.19 mph (103.31 km/h) |
| 65 mph (104.61 km/h) | 69.54 mph (111.92 km/h) |
| 70 mph (112.65 km/h) | 74.89 mph (120.53 km/h) |
| 75 mph (120.7 km/h) | 80.24 mph (129.13 km/h) |
| 80 mph (128.75 km/h) | 85.59 mph (137.74 km/h) |
| 85 mph (136.79 km/h) | 90.94 mph (146.35 km/h) |
| 90 mph (144.84 km/h) | 96.29 mph (154.96 km/h) |
| 95 mph (152.89 km/h) | 101.64 mph (163.57 km/h) |
| 100 mph (160.93 km/h) | 106.99 mph (172.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1831 | 2127 | 2291 | 2392 | 2501 | 2579 | 2665 | 2766 | 2906 | 3046 | 3202 | 3327 | 3553 | 3802 | 3997 | 4122 | 4192 | 4449 | 4807 | 5586 |
Better Fuel Economy Factory Ratios Increased Power
