If your vehicle's tyres are shredded or worn down so much that they're basically smooth, of course it's time to upgrade or change them. You don't want to wait until you have a blowout to replace the tyres on your vehicles, as driving on worn tyres is very unsafe. New tyres can also improve the overall handling and stability of your vehicle. Since vehicle tyres are so important, note when it might be time to change or upgrade them and how this can improve your everyday driving.
You need better control
Your current tyres can be in good condition, but they may be overly small for your vehicle or made with inferior rubber and other materials so that they don't grip the road properly. Tyres installed by a car manufacturer may be very basic, with not much depth to the tread, and the rubber on those tyres may also be thin and brittle so that they don't grip the road very well. If you need better control over your vehicle while turning or during a fast start, upgrade to performance tyres or to a reputable name brand, and this may make a tremendous difference in how your vehicle handles.
Your drive is loud
Tyres provide grip and traction, but they also provide insulation against sound. If the rubber on the tyres is very thin and brittle, or the tyres are very small, this insulation will be minimal. In turn, you may hear a constant rumbling, vibrating or other such noise while driving. Just as rubber helps to insulate sound in any other setting, higher-quality rubber on your tyres can help to block those outside sounds, making your ride quieter.
You've been driving in very inclement weather recently
While snow tyres are meant to give you added traction and grip on icy roads, their tread can get worn down easily by the resistance they experience when you drive in snow, mud and the like. Very hot pavement can also damage the rubber of tyres; if you've had a lot of unseasonably warm summers, or have been driving on hot asphalt lately, your tyres may have suffered damage.
It's also good to think about changing out your tyres more often if you go off-roading, drive in the beach, or otherwise drive over rough terrain that can damage the rubber and tread. Even excess moisture can soften rubber, so if you've been driving in any inclement weather or over rough surfaces, have your tyres checked for a needed upgrade and replacement.
For more information or to just get new tyres, visit a local tyres shop and check out your options, such as Toyo tyers.