Each year, make, and model can have different size options. The easiest way to find yours is the door jamb placard (also called the safety compliance certification label or FMVSS label). This is a permanent sticker on most vehicles, usually on the driver’s side door jambe. There you can find the original tire size(s) that are supposed to be on the vehicle. 

You can always reach out us to with any questions you may have, such as aftermarket wheels and alternative size options.