If you don’t know your tire size, you can check your owner’s manual or the side of the tires. The tire size will appear as a series of letters and numbers, but you’ll want to note the two numbers directly following the R. That is the diameter of your rim in inches and the size of hubcap you’ll need.
Here’s an example of how to find the right hubcap for your Cadillac SRX:
The 2016 standard Cadillac SRX tire size is P235/65R18. That means your rim is 18 inches, so you’ll need a hubcap that is 18 inches, too. After you find the hubcap size, you can purchase a hubcap set for your Cadillac SRX on eBay, online, or from a dealership.