You can sell used tires to a local auto body shop, online yourself on a marketplace like Craigslist (if they are in good condition), or to a company that recycles them into a new product. This is only if they’re still usable. If they aren’t, you have to recycle them (see below).
Generally, selling a used tire only gets you about $10-$25 per tire (depending on their condition), so most don’t even bother. If you have larger truck tires (in good condition), they might fetch you up to $60. You can find companies by searching online and calling them to see how much they’ll pay.
Be sure to check the quality of the tire before and do your research. The more you know, the better you can haggle with a shop or potential buyer online.
Note: Recycling old tires can actually COST you money, so factor that into your profit as well. For example, if it costs you $10 to recycle a tire but instead you sell it for $3, then you made $3 instead of spending $10, so you just netted $13!