Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/12.5-18 | 355/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.03 (940.56) | 36.17 (918.7) | -0.86 (-21.86) -2.3% |
| Width inches (mm) | 12.52 (318) | 13.98 (355) | 1.46 (37) 11.6% |
| Circum. inches (mm) | 116.33 (2954.86) | 113.63 (2886.18) | -2.7 (-68.68) -2.3% |
| Sidewall Height inches (mm) | 9.51 (241.68) | 9.08 (230.75) | -0.43 (-10.93) -4.5% |
| Revolutions per mile (km) | 544.64 (338.43) | 557.6 (346.48) | 12.96 (8.05) 2.4% |
355/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.54 mph (31.44 km/h) |
| 25 mph (40.23 km/h) | 24.42 mph (39.3 km/h) |
| 30 mph (48.28 km/h) | 29.3 mph (47.16 km/h) |
| 35 mph (56.33 km/h) | 34.19 mph (55.02 km/h) |
| 40 mph (64.37 km/h) | 39.07 mph (62.88 km/h) |
| 45 mph (72.42 km/h) | 43.95 mph (70.74 km/h) |
| 50 mph (80.47 km/h) | 48.84 mph (78.6 km/h) |
| 55 mph (88.51 km/h) | 53.72 mph (86.46 km/h) |
| 60 mph (96.56 km/h) | 58.61 mph (94.32 km/h) |
| 65 mph (104.61 km/h) | 63.49 mph (102.18 km/h) |
| 70 mph (112.65 km/h) | 68.37 mph (110.04 km/h) |
| 75 mph (120.7 km/h) | 73.26 mph (117.9 km/h) |
| 80 mph (128.75 km/h) | 78.14 mph (125.76 km/h) |
| 85 mph (136.79 km/h) | 83.02 mph (133.62 km/h) |
| 90 mph (144.84 km/h) | 87.91 mph (141.47 km/h) |
| 95 mph (152.89 km/h) | 92.79 mph (149.33 km/h) |
| 100 mph (160.93 km/h) | 97.68 mph (157.19 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 |
Better Fuel Economy Factory Ratios Increased Power
