225/65R17 isn't a serial number — every part of it tells you something. Here's what.
Two practical reasons to know this. First, the last number is your hubcap size — the single most common reason people buy the wrong wheel cover online and have to send it back. Second, when you're pricing tires, the size determines everything; a quote without it is meaningless.
It's also worth knowing that changing size isn't free. Go wider or shorter and you change the rolling diameter, which throws off your speedometer and can affect how the car handles. If you're thinking about a different size, talk to us first — it's a five-minute conversation that avoids an expensive mistake.