Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 230/90-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 33.8 (858.5) | 7.77 (197.3) 29.8% |
| Width inches (mm) | 4.72 (120) | 9.06 (230) | 4.33 (110) 91.7% |
| Circum. inches (mm) | 81.78 (2077.22) | 106.18 (2697.06) | 24.4 (619.84) 29.8% |
| Sidewall Height inches (mm) | 4.02 (102) | 8.15 (207) | 4.13 (105) 102.9% |
| Revolutions per mile (km) | 774.76 (481.41) | 596.7 (370.77) | -178.05 (-110.64) -23% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.97 mph (41.79 km/h) |
| 25 mph (40.23 km/h) | 32.46 mph (52.24 km/h) |
| 30 mph (48.28 km/h) | 38.95 mph (62.69 km/h) |
| 35 mph (56.33 km/h) | 45.44 mph (73.13 km/h) |
| 40 mph (64.37 km/h) | 51.94 mph (83.58 km/h) |
| 45 mph (72.42 km/h) | 58.43 mph (94.03 km/h) |
| 50 mph (80.47 km/h) | 64.92 mph (104.48 km/h) |
| 55 mph (88.51 km/h) | 71.41 mph (114.93 km/h) |
| 60 mph (96.56 km/h) | 77.9 mph (125.37 km/h) |
| 65 mph (104.61 km/h) | 84.4 mph (135.82 km/h) |
| 70 mph (112.65 km/h) | 90.89 mph (146.27 km/h) |
| 75 mph (120.7 km/h) | 97.38 mph (156.72 km/h) |
| 80 mph (128.75 km/h) | 103.87 mph (167.17 km/h) |
| 85 mph (136.79 km/h) | 110.36 mph (177.61 km/h) |
| 90 mph (144.84 km/h) | 116.86 mph (188.06 km/h) |
| 95 mph (152.89 km/h) | 123.35 mph (198.51 km/h) |
| 100 mph (160.93 km/h) | 129.84 mph (208.96 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1518 | 1764 | 1900 | 1984 | 2074 | 2139 | 2210 | 2294 | 2410 | 2527 | 2656 | 2759 | 2947 | 3153 | 3315 | 3418 | 3476 | 3690 | 3987 | 4633 |
Better Fuel Economy Factory Ratios Increased Power
