Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 235/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 33.88 (860.5) | 7.85 (199.3) 30.1% |
| Width inches (mm) | 4.72 (120) | 9.25 (235) | 4.53 (115) 95.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 106.43 (2703.34) | 24.65 (626.12) 30.1% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.94 (176.25) | 2.92 (74.25) 72.8% |
| Revolutions per mile (km) | 774.76 (481.41) | 595.32 (369.91) | -179.44 (-111.5) -23.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.03 mph (41.89 km/h) |
| 25 mph (40.23 km/h) | 32.54 mph (52.36 km/h) |
| 30 mph (48.28 km/h) | 39.04 mph (62.83 km/h) |
| 35 mph (56.33 km/h) | 45.55 mph (73.31 km/h) |
| 40 mph (64.37 km/h) | 52.06 mph (83.78 km/h) |
| 45 mph (72.42 km/h) | 58.56 mph (94.25 km/h) |
| 50 mph (80.47 km/h) | 65.07 mph (104.72 km/h) |
| 55 mph (88.51 km/h) | 71.58 mph (115.19 km/h) |
| 60 mph (96.56 km/h) | 78.09 mph (125.67 km/h) |
| 65 mph (104.61 km/h) | 84.59 mph (136.14 km/h) |
| 70 mph (112.65 km/h) | 91.1 mph (146.61 km/h) |
| 75 mph (120.7 km/h) | 97.61 mph (157.08 km/h) |
| 80 mph (128.75 km/h) | 104.11 mph (167.56 km/h) |
| 85 mph (136.79 km/h) | 110.62 mph (178.03 km/h) |
| 90 mph (144.84 km/h) | 117.13 mph (188.5 km/h) |
| 95 mph (152.89 km/h) | 123.64 mph (198.97 km/h) |
| 100 mph (160.93 km/h) | 130.14 mph (209.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1515 | 1760 | 1895 | 1979 | 2069 | 2134 | 2205 | 2289 | 2405 | 2521 | 2650 | 2753 | 2940 | 3146 | 3307 | 3410 | 3468 | 3681 | 3978 | 4622 |
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