For the tire you can also use a penny. If you stick the penny in the tread with Liconln’s head down and his hair isn’t covered, then you need new tires. No AI. ;)
You don't even need a penny, or have to remember where on the penny you're supposed to be looking... There are wear bars in the tread in every single tire. If the tire tread is flush with them, the tires are shot. Also there is a date code on the side, and if your tires are getting near 10 years old, it's probably a good time to replace them.
