Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 215/25-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 22.23 (564.7) | -1.32 (-33.5) -5.6% |
| Width inches (mm) | 9.25 (235) | 8.46 (215) | -0.79 (-20) -8.5% |
| Circum. inches (mm) | 73.99 (1879.3) | 69.84 (1774.06) | -4.14 (-105.24) -5.6% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 2.12 (53.75) | -0.66 (-16.75) -23.8% |
| Revolutions per mile (km) | 856.35 (532.11) | 907.15 (563.68) | 50.8 (31.57) 5.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.88 mph (30.38 km/h) |
| 25 mph (40.23 km/h) | 23.6 mph (37.98 km/h) |
| 30 mph (48.28 km/h) | 28.32 mph (45.58 km/h) |
| 35 mph (56.33 km/h) | 33.04 mph (53.17 km/h) |
| 40 mph (64.37 km/h) | 37.76 mph (60.77 km/h) |
| 45 mph (72.42 km/h) | 42.48 mph (68.36 km/h) |
| 50 mph (80.47 km/h) | 47.2 mph (75.96 km/h) |
| 55 mph (88.51 km/h) | 51.92 mph (83.56 km/h) |
| 60 mph (96.56 km/h) | 56.64 mph (91.15 km/h) |
| 65 mph (104.61 km/h) | 61.36 mph (98.75 km/h) |
| 70 mph (112.65 km/h) | 66.08 mph (106.35 km/h) |
| 75 mph (120.7 km/h) | 70.8 mph (113.94 km/h) |
| 80 mph (128.75 km/h) | 75.52 mph (121.54 km/h) |
| 85 mph (136.79 km/h) | 80.24 mph (129.13 km/h) |
| 90 mph (144.84 km/h) | 84.96 mph (136.73 km/h) |
| 95 mph (152.89 km/h) | 89.68 mph (144.33 km/h) |
| 100 mph (160.93 km/h) | 94.4 mph (151.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2309 | 2682 | 2888 | 3016 | 3153 | 3252 | 3360 | 3487 | 3664 | 3841 | 4037 | 4195 | 4480 | 4794 | 5039 | 5197 | 5285 | 5609 | 6061 | 7043 |
Better Fuel Economy Factory Ratios Increased Power
