Understanding how to pick out the right size Tires Rims and wheels

This item is in the category eBay Motors\Parts & Accessories\Car & Truck Parts\Wheels, Tires & Parts\Other. The item 19 inch cadillac 4 ct6 xts cts 08-19 polished rims wheels set 4775 oem factory is in sale since Wednesday, May 29, 2019.