My 2006 Ford F150 King Ranch requires tires. Does reducing rim size provide more tire size options?

Depends on what size rims you have currently. There is more than one size of factory rim for the King Ranch in 06. By the time you buy new wheels you'd spend more than just buying the tires in most cases.

The smallest size you can use is a 17x7.5 rim to clear the brake system on the front. Assuming you have a 4x2. More.

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