Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 215/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 26.46 (672.2) | 2.91 (74) 12.4% |
| Width inches (mm) | 9.25 (235) | 8.46 (215) | -0.79 (-20) -8.5% |
| Circum. inches (mm) | 73.99 (1879.3) | 83.14 (2111.78) | 9.15 (232.48) 12.4% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 4.23 (107.5) | 1.46 (37) 52.5% |
| Revolutions per mile (km) | 856.35 (532.11) | 762.08 (473.53) | -94.27 (-58.58) -11% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.47 mph (36.17 km/h) |
| 25 mph (40.23 km/h) | 28.09 mph (45.21 km/h) |
| 30 mph (48.28 km/h) | 33.71 mph (54.25 km/h) |
| 35 mph (56.33 km/h) | 39.33 mph (63.3 km/h) |
| 40 mph (64.37 km/h) | 44.95 mph (72.34 km/h) |
| 45 mph (72.42 km/h) | 50.57 mph (81.38 km/h) |
| 50 mph (80.47 km/h) | 56.19 mph (90.42 km/h) |
| 55 mph (88.51 km/h) | 61.8 mph (99.46 km/h) |
| 60 mph (96.56 km/h) | 67.42 mph (108.51 km/h) |
| 65 mph (104.61 km/h) | 73.04 mph (117.55 km/h) |
| 70 mph (112.65 km/h) | 78.66 mph (126.59 km/h) |
| 75 mph (120.7 km/h) | 84.28 mph (135.63 km/h) |
| 80 mph (128.75 km/h) | 89.9 mph (144.67 km/h) |
| 85 mph (136.79 km/h) | 95.51 mph (153.72 km/h) |
| 90 mph (144.84 km/h) | 101.13 mph (162.76 km/h) |
| 95 mph (152.89 km/h) | 106.75 mph (171.8 km/h) |
| 100 mph (160.93 km/h) | 112.37 mph (180.84 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1939 | 2253 | 2426 | 2534 | 2649 | 2732 | 2822 | 2930 | 3078 | 3227 | 3392 | 3524 | 3763 | 4027 | 4234 | 4366 | 4440 | 4712 | 5092 | 5917 |
Better Fuel Economy Factory Ratios Increased Power
