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The 2019 Kia Optima is available in four different trim options: the LX, S, EX, and the top-tier SX Turbo. Each trim level comes equipped with different tire sizes. The LX has P205/65R16 tires, the EX has P215/55R17 tires, and the S and SX Turbo have P235/45R18 tires. These tires range from 16 to 18 inches in diameter and 6.5 to 7.5 inches in width. The bolt pattern for all trims is 5 X114.3, with a center bore size of 67.1mm. Luckily, this size is common, allowing for compatibility with many aftermarket wheels. When it comes to lug nuts, each wheel requires five with a thread size of M12 X1.5. The nut heads are 19mm hex, and they need to be torqued to a minimum of 107 Nm.
The 2019 Kia Optima's lug nuts require a 19mm hex socket and have a thread size of m12 x 1.5.