Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 215/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 23.08 (586.2) | -2.95 (-75) -11.3% |
| Width inches (mm) | 4.72 (120) | 8.46 (215) | 3.74 (95) 79.2% |
| Circum. inches (mm) | 81.78 (2077.22) | 72.5 (1841.6) | -9.28 (-235.62) -11.3% |
| Sidewall Height inches (mm) | 4.02 (102) | 2.54 (64.5) | -1.48 (-37.5) -36.8% |
| Revolutions per mile (km) | 774.76 (481.41) | 873.88 (543) | 99.12 (61.59) 12.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.73 mph (28.54 km/h) |
| 25 mph (40.23 km/h) | 22.16 mph (35.67 km/h) |
| 30 mph (48.28 km/h) | 26.6 mph (42.8 km/h) |
| 35 mph (56.33 km/h) | 31.03 mph (49.94 km/h) |
| 40 mph (64.37 km/h) | 35.46 mph (57.07 km/h) |
| 45 mph (72.42 km/h) | 39.9 mph (64.21 km/h) |
| 50 mph (80.47 km/h) | 44.33 mph (71.34 km/h) |
| 55 mph (88.51 km/h) | 48.76 mph (78.47 km/h) |
| 60 mph (96.56 km/h) | 53.19 mph (85.61 km/h) |
| 65 mph (104.61 km/h) | 57.63 mph (92.74 km/h) |
| 70 mph (112.65 km/h) | 62.06 mph (99.88 km/h) |
| 75 mph (120.7 km/h) | 66.49 mph (107.01 km/h) |
| 80 mph (128.75 km/h) | 70.93 mph (114.14 km/h) |
| 85 mph (136.79 km/h) | 75.36 mph (121.28 km/h) |
| 90 mph (144.84 km/h) | 79.79 mph (128.41 km/h) |
| 95 mph (152.89 km/h) | 84.22 mph (135.55 km/h) |
| 100 mph (160.93 km/h) | 88.66 mph (142.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2224 | 2583 | 2782 | 2905 | 3038 | 3132 | 3236 | 3359 | 3530 | 3700 | 3889 | 4041 | 4315 | 4618 | 4855 | 5006 | 5091 | 5404 | 5839 | 6785 |
Better Fuel Economy Factory Ratios Increased Power
