Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/35-18 | 185/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.2 (614.7) | 23.83 (605.2) | -0.37 (-9.5) -1.5% |
| Width inches (mm) | 8.86 (225) | 7.28 (185) | -1.57 (-40) -17.8% |
| Circum. inches (mm) | 76.03 (1931.14) | 74.85 (1901.29) | -1.18 (-29.85) -1.5% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 2.91 (74) | -0.19 (-4.75) -6% |
| Revolutions per mile (km) | 833.37 (517.83) | 846.45 (525.96) | 13.08 (8.13) 1.6% |
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) | 24.61 mph (39.61 km/h) |
| 30 mph (48.28 km/h) | 29.54 mph (47.53 km/h) |
| 35 mph (56.33 km/h) | 34.46 mph (55.46 km/h) |
| 40 mph (64.37 km/h) | 39.38 mph (63.38 km/h) |
| 45 mph (72.42 km/h) | 44.3 mph (71.3 km/h) |
| 50 mph (80.47 km/h) | 49.23 mph (79.22 km/h) |
| 55 mph (88.51 km/h) | 54.15 mph (87.15 km/h) |
| 60 mph (96.56 km/h) | 59.07 mph (95.07 km/h) |
| 65 mph (104.61 km/h) | 64 mph (102.99 km/h) |
| 70 mph (112.65 km/h) | 68.92 mph (110.91 km/h) |
| 75 mph (120.7 km/h) | 73.84 mph (118.84 km/h) |
| 80 mph (128.75 km/h) | 78.76 mph (126.76 km/h) |
| 85 mph (136.79 km/h) | 83.69 mph (134.68 km/h) |
| 90 mph (144.84 km/h) | 88.61 mph (142.6 km/h) |
| 95 mph (152.89 km/h) | 93.53 mph (150.53 km/h) |
| 100 mph (160.93 km/h) | 98.45 mph (158.45 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2154 | 2502 | 2695 | 2814 | 2942 | 3034 | 3135 | 3254 | 3419 | 3584 | 3767 | 3914 | 4180 | 4473 | 4702 | 4849 | 4931 | 5234 | 5656 | 6572 |
Better Fuel Economy Factory Ratios Increased Power
