Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 355/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 36.17 (918.7) | 10.14 (257.5) 38.9% |
| Width inches (mm) | 4.72 (120) | 13.98 (355) | 9.25 (235) 195.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 113.63 (2886.18) | 31.85 (808.96) 38.9% |
| Sidewall Height inches (mm) | 4.02 (102) | 9.08 (230.75) | 5.07 (128.75) 126.2% |
| Revolutions per mile (km) | 774.76 (481.41) | 557.6 (346.48) | -217.15 (-134.93) -28% |
355/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.79 mph (44.72 km/h) |
| 25 mph (40.23 km/h) | 34.74 mph (55.9 km/h) |
| 30 mph (48.28 km/h) | 41.68 mph (67.08 km/h) |
| 35 mph (56.33 km/h) | 48.63 mph (78.26 km/h) |
| 40 mph (64.37 km/h) | 55.58 mph (89.44 km/h) |
| 45 mph (72.42 km/h) | 62.52 mph (100.62 km/h) |
| 50 mph (80.47 km/h) | 69.47 mph (111.8 km/h) |
| 55 mph (88.51 km/h) | 76.42 mph (122.99 km/h) |
| 60 mph (96.56 km/h) | 83.37 mph (134.17 km/h) |
| 65 mph (104.61 km/h) | 90.31 mph (145.35 km/h) |
| 70 mph (112.65 km/h) | 97.26 mph (156.53 km/h) |
| 75 mph (120.7 km/h) | 104.21 mph (167.71 km/h) |
| 80 mph (128.75 km/h) | 111.16 mph (178.89 km/h) |
| 85 mph (136.79 km/h) | 118.1 mph (190.07 km/h) |
| 90 mph (144.84 km/h) | 125.05 mph (201.25 km/h) |
| 95 mph (152.89 km/h) | 132 mph (212.43 km/h) |
| 100 mph (160.93 km/h) | 138.94 mph (223.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1419 | 1648 | 1775 | 1854 | 1938 | 1999 | 2065 | 2144 | 2252 | 2361 | 2482 | 2578 | 2753 | 2947 | 3098 | 3194 | 3249 | 3448 | 3726 | 4329 |
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