3 plain-English guides.

The squeal is a warning on purpose. The grind means you waited too long.

The big PSI on the sidewall is a maximum, not a target — and it matters more than you think.

Even tread wear is basically free money — you're just moving wheels around.
Join drivers who'd rather spend an hour in the driveway than $300 at the shop. Free, and you can quit anytime.