THINGS TO CONSIDER WHEN BUYING USED TYRES

WHAT YOU SHOULD CONSIDER WHEN BUYING A USED TYRE

Looking up reviews about a tyre store is always a good start. Do they treat their customers well? Do they go above and beyond the basic level of service? Are they dependable and fair? If so, then they're worth looking into buying used tyres from. If they seem like they take cheap shortcuts and cause more problems for their customers than they fix, you might avoid them
Once you've determined a good place to shop, you'll want to take a look at the actual tyres.
Make sure you're looking at the correct sizes of tyres for your car. It's always a good idea to check your car's manual instead of assuming that your current tyres are the correct size because there maybe an alternative size also. If you don't have a car manual, you can also check for a metal tag in your driver's door jamb, your glove compartment door, or your fuel hatch.
Once you're looking at the right tyre size, then check the physical condition of the tyre for this possible wear and tear.
here are the hings you need to physically check
Tread Wear
Use a coin to figure out if the tyres have enough tread. Take a coin and put it in the middle of the tyre's tread. You want to be able to see the heads side of the coin, If the tread covers up to half, then the tyre has plenty of tread left. but proceed with caution.
Wear Distribution
wear distribution should be even across the face of the tyre. Be aware of wear that is only on one side of the tyre, is only in the middle of the tyre, is only on one place on the tyre, or is in spots across the tyre (cupping). Also look for bubbles or pockets of air underneath the rubber of the tire. Uneven wear diminishes the effectiveness of a tyre and can be dangerous to use.
Matching Treads
Try to find treads that match, whether this is replacing one tyre and matching it to your other tyres, or finding four tyres that all match each other. Having tires with the different treads can reduce the effectiveness of the tires as a set, causing more wear or dangerous driving conditions, at least try to find 2 treads that match.
Punctures/Patching
Check the sides (and insides, if you can) of the tyre for patches, plugs, etc. If a tyre has several repairs done to it, it's probably an indicator of a problem tyre.