Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/35-19 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.48 (647.1) | 25.09 (637.2) | -0.39 (-9.9) -1.5% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 80.04 (2032.92) | 78.81 (2001.82) | -1.22 (-31.1) -1.5% |
| Sidewall Height inches (mm) | 3.24 (82.25) | 3.54 (90) | 0.31 (7.75) 9.4% |
| Revolutions per mile (km) | 791.64 (491.9) | 803.94 (499.54) | 12.3 (7.64) 1.6% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.69 mph (31.69 km/h) |
| 25 mph (40.23 km/h) | 24.62 mph (39.62 km/h) |
| 30 mph (48.28 km/h) | 29.54 mph (47.54 km/h) |
| 35 mph (56.33 km/h) | 34.46 mph (55.47 km/h) |
| 40 mph (64.37 km/h) | 39.39 mph (63.39 km/h) |
| 45 mph (72.42 km/h) | 44.31 mph (71.31 km/h) |
| 50 mph (80.47 km/h) | 49.24 mph (79.24 km/h) |
| 55 mph (88.51 km/h) | 54.16 mph (87.16 km/h) |
| 60 mph (96.56 km/h) | 59.08 mph (95.08 km/h) |
| 65 mph (104.61 km/h) | 64.01 mph (103.01 km/h) |
| 70 mph (112.65 km/h) | 68.93 mph (110.93 km/h) |
| 75 mph (120.7 km/h) | 73.85 mph (118.85 km/h) |
| 80 mph (128.75 km/h) | 78.78 mph (126.78 km/h) |
| 85 mph (136.79 km/h) | 83.7 mph (134.7 km/h) |
| 90 mph (144.84 km/h) | 88.62 mph (142.63 km/h) |
| 95 mph (152.89 km/h) | 93.55 mph (150.55 km/h) |
| 100 mph (160.93 km/h) | 98.47 mph (158.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2046 | 2377 | 2560 | 2673 | 2795 | 2882 | 2977 | 3091 | 3247 | 3404 | 3578 | 3717 | 3970 | 4248 | 4466 | 4605 | 4684 | 4971 | 5372 | 6242 |
Better Fuel Economy Factory Ratios Increased Power
