Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 29/9.5-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 28.96 (735.46) | 2.92 (74.26) 11.2% |
| Width inches (mm) | 4.72 (120) | 9.49 (241) | 4.76 (121) 100.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 90.97 (2310.52) | 9.18 (233.29) 11.2% |
| Sidewall Height inches (mm) | 4.02 (102) | 5.98 (151.83) | 1.96 (49.83) 48.9% |
| Revolutions per mile (km) | 774.76 (481.41) | 696.53 (432.8) | -78.23 (-48.61) -10.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.25 mph (35.8 km/h) |
| 25 mph (40.23 km/h) | 27.81 mph (44.75 km/h) |
| 30 mph (48.28 km/h) | 33.37 mph (53.7 km/h) |
| 35 mph (56.33 km/h) | 38.93 mph (62.65 km/h) |
| 40 mph (64.37 km/h) | 44.49 mph (71.6 km/h) |
| 45 mph (72.42 km/h) | 50.05 mph (80.55 km/h) |
| 50 mph (80.47 km/h) | 55.62 mph (89.5 km/h) |
| 55 mph (88.51 km/h) | 61.18 mph (98.46 km/h) |
| 60 mph (96.56 km/h) | 66.74 mph (107.41 km/h) |
| 65 mph (104.61 km/h) | 72.3 mph (116.36 km/h) |
| 70 mph (112.65 km/h) | 77.86 mph (125.31 km/h) |
| 75 mph (120.7 km/h) | 83.42 mph (134.26 km/h) |
| 80 mph (128.75 km/h) | 88.98 mph (143.21 km/h) |
| 85 mph (136.79 km/h) | 94.55 mph (152.16 km/h) |
| 90 mph (144.84 km/h) | 100.11 mph (161.11 km/h) |
| 95 mph (152.89 km/h) | 105.67 mph (170.06 km/h) |
| 100 mph (160.93 km/h) | 111.23 mph (179.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1773 | 2059 | 2218 | 2316 | 2421 | 2497 | 2580 | 2678 | 2813 | 2949 | 3100 | 3221 | 3439 | 3681 | 3869 | 3990 | 4058 | 4307 | 4654 | 5408 |
Better Fuel Economy Factory Ratios Increased Power
