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The wheel size for the 2017 Ford Expedition is 18 inches, and it is recommended to have a tire pressure of 35 psi. The tire size is 275/65r18. It is important to check your tire air pressure monthly using a reliable tire gauge. Having low tire pressure can be hazardous, potentially causing a blowout. Low pressure could be due to a leak or natural loss of pressure over time. When pressure drops too low, the tire's sidewalls flex more, leading to heat buildup within the tire. Excessive air pressure can also distort the tire shape, resulting in reduced traction and increased wear down the center of the tire. In some cases, regularly overinflated tires may wear out faster.
The 2017 Ford Expedition comes with 18-inch wheels, the recommended tire pressure is 35 pounds per square inch (psi), and the tire size is 275/65R18.