Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 29/10.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.93 (734.88) | 0.7 (17.68) 2.5% |
| Width inches (mm) | 12.8 (325) | 10.51 (267) | -2.28 (-58) -17.8% |
| Circum. inches (mm) | 88.71 (2253.15) | 90.89 (2308.69) | 2.19 (55.54) 2.5% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.47 (138.84) | 0.35 (8.84) 6.8% |
| Revolutions per mile (km) | 714.26 (443.82) | 697.08 (433.14) | -17.18 (-10.68) -2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.49 mph (32.98 km/h) |
| 25 mph (40.23 km/h) | 25.62 mph (41.23 km/h) |
| 30 mph (48.28 km/h) | 30.74 mph (49.47 km/h) |
| 35 mph (56.33 km/h) | 35.86 mph (57.72 km/h) |
| 40 mph (64.37 km/h) | 40.99 mph (65.96 km/h) |
| 45 mph (72.42 km/h) | 46.11 mph (74.21 km/h) |
| 50 mph (80.47 km/h) | 51.23 mph (82.45 km/h) |
| 55 mph (88.51 km/h) | 56.36 mph (90.7 km/h) |
| 60 mph (96.56 km/h) | 61.48 mph (98.94 km/h) |
| 65 mph (104.61 km/h) | 66.6 mph (107.19 km/h) |
| 70 mph (112.65 km/h) | 71.73 mph (115.43 km/h) |
| 75 mph (120.7 km/h) | 76.85 mph (123.68 km/h) |
| 80 mph (128.75 km/h) | 81.97 mph (131.92 km/h) |
| 85 mph (136.79 km/h) | 87.1 mph (140.17 km/h) |
| 90 mph (144.84 km/h) | 92.22 mph (148.41 km/h) |
| 95 mph (152.89 km/h) | 97.34 mph (156.66 km/h) |
| 100 mph (160.93 km/h) | 102.47 mph (164.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1774 | 2061 | 2219 | 2317 | 2423 | 2499 | 2582 | 2680 | 2816 | 2952 | 3102 | 3223 | 3442 | 3684 | 3872 | 3993 | 4061 | 4310 | 4658 | 5412 |
Better Fuel Economy Factory Ratios Increased Power
