Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 205/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 28.49 (723.7) | 2.46 (62.5) 9.5% |
| Width inches (mm) | 4.72 (120) | 8.07 (205) | 3.35 (85) 70.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 89.51 (2273.57) | 7.73 (196.35) 9.5% |
| Sidewall Height inches (mm) | 4.02 (102) | 5.25 (133.25) | 1.23 (31.25) 30.6% |
| Revolutions per mile (km) | 774.76 (481.41) | 707.85 (439.84) | -66.91 (-41.58) -8.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.89 mph (35.23 km/h) |
| 25 mph (40.23 km/h) | 27.36 mph (44.04 km/h) |
| 30 mph (48.28 km/h) | 32.84 mph (52.84 km/h) |
| 35 mph (56.33 km/h) | 38.31 mph (61.65 km/h) |
| 40 mph (64.37 km/h) | 43.78 mph (70.46 km/h) |
| 45 mph (72.42 km/h) | 49.25 mph (79.27 km/h) |
| 50 mph (80.47 km/h) | 54.73 mph (88.07 km/h) |
| 55 mph (88.51 km/h) | 60.2 mph (96.88 km/h) |
| 60 mph (96.56 km/h) | 65.67 mph (105.69 km/h) |
| 65 mph (104.61 km/h) | 71.14 mph (114.5 km/h) |
| 70 mph (112.65 km/h) | 76.62 mph (123.3 km/h) |
| 75 mph (120.7 km/h) | 82.09 mph (132.11 km/h) |
| 80 mph (128.75 km/h) | 87.56 mph (140.92 km/h) |
| 85 mph (136.79 km/h) | 93.03 mph (149.73 km/h) |
| 90 mph (144.84 km/h) | 98.51 mph (158.53 km/h) |
| 95 mph (152.89 km/h) | 103.98 mph (167.34 km/h) |
| 100 mph (160.93 km/h) | 109.45 mph (176.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1801 | 2093 | 2254 | 2353 | 2461 | 2537 | 2622 | 2721 | 2859 | 2997 | 3150 | 3273 | 3495 | 3741 | 3932 | 4055 | 4124 | 4377 | 4729 | 5496 |
Better Fuel Economy Factory Ratios Increased Power
