Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 230/70-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 30.18 (766.5) | 4.15 (105.3) 15.9% |
| Width inches (mm) | 4.72 (120) | 9.06 (230) | 4.33 (110) 91.7% |
| Circum. inches (mm) | 81.78 (2077.22) | 94.8 (2408.03) | 13.02 (330.81) 15.9% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.34 (161) | 2.32 (59) 57.8% |
| Revolutions per mile (km) | 774.76 (481.41) | 668.32 (415.28) | -106.43 (-66.14) -13.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.19 mph (37.31 km/h) |
| 25 mph (40.23 km/h) | 28.98 mph (46.64 km/h) |
| 30 mph (48.28 km/h) | 34.78 mph (55.97 km/h) |
| 35 mph (56.33 km/h) | 40.57 mph (65.3 km/h) |
| 40 mph (64.37 km/h) | 46.37 mph (74.63 km/h) |
| 45 mph (72.42 km/h) | 52.17 mph (83.95 km/h) |
| 50 mph (80.47 km/h) | 57.96 mph (93.28 km/h) |
| 55 mph (88.51 km/h) | 63.76 mph (102.61 km/h) |
| 60 mph (96.56 km/h) | 69.56 mph (111.94 km/h) |
| 65 mph (104.61 km/h) | 75.35 mph (121.27 km/h) |
| 70 mph (112.65 km/h) | 81.15 mph (130.6 km/h) |
| 75 mph (120.7 km/h) | 86.94 mph (139.92 km/h) |
| 80 mph (128.75 km/h) | 92.74 mph (149.25 km/h) |
| 85 mph (136.79 km/h) | 98.54 mph (158.58 km/h) |
| 90 mph (144.84 km/h) | 104.33 mph (167.91 km/h) |
| 95 mph (152.89 km/h) | 110.13 mph (177.24 km/h) |
| 100 mph (160.93 km/h) | 115.93 mph (186.56 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1701 | 1976 | 2128 | 2222 | 2323 | 2396 | 2475 | 2569 | 2699 | 2830 | 2975 | 3090 | 3300 | 3532 | 3713 | 3829 | 3894 | 4132 | 4465 | 5189 |
Better Fuel Economy Factory Ratios Increased Power
