AJLex19

@dsandrews2 thats the height of the tire. Higher profile tires typically have more sidewall and a more "comfy" ride while sacrificing cornering and handling abilities. Here's a good site for reference: https://www.goodyearautoservice.com/...sics/tire-size

SW17LS

The "series" refers to the % of the tire's tread width that the sidewall is. So a 45 series tire has a sidewall height that is 45% of the tread's width. 45 series tires are generally the tallest that are considered "low profile tires"