Answers:
The short answer is that you will need to change the tires when the tread depth is less than or equal to 2 milimeters.
Wear bars also show through when it's time to change tires on many tire brands.
You may need to change your tires sooner if you are experiencing uneaven wear (some sections i.e. outer edges, tread depth is lower than others on the same tire).
Take it to a tire station and ask for a rough estimate on tread percentage. I will drive rubber to 20%, but sane people usually change out at 40%
when you have no tred left on them.
An old method and a good one is to get a regular matchstsick, break off the head and place it in the grooves of your tire. If the matchstick sticks out further than the rubber its time for new tires, if not you can keep your wallet in your sky rocket for a bit longer.
When you have no thread left and are running on wires!
Use the penny test. Put a penny upside down between the treads. If you can see the top of Abe's head, it's time to replace them.
Also, if the tires are 4 years old or more, I would change them.
Under normal city driving conditions, tires should last at least three years, less if roads in your area are not so well-paved.
Inspect your tires closely. If you notice any of these signs, for goodness sake, hurry up and change:
- exposed polyester threads or steel belts
- bulging on any tire surface particularly the sidewall
- one bald side/uneven roadwear
Some drivers won't replace tires while there's still a shadow of tread left but that's very dangerous particularly with a heavy load on a hot road surface or under slippery road conditions.
two things to consider when picking tires:
- consider the road noise (Yokohama, Dunlop, Michelin, Pirelli are 'quiet' types)
- some manufacturers still use polyester instead of steel belts (steel belts are safer). check out the tiny letters on the sidewall, it's written there.
I put Michelins on my car and the tread never wears off. They just get old and I have to replace them because of dryrot and cracking all over.
When the threading is very low (worn out), it sometimes called "balding"
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