Changes when replacing worn-out tires with new ones

Tires wear out with every kilometer driven. But the charm of tires lies in the fact that having a delicate balance of characteristics, it's never the case that all tire characteristics only deteriorate. Balance is balance, if one characteristic decreases, then another one necessarily increases. Today, we'll explore this subtle interconnection. 

To start, let's figure out where the decrease in characteristics occurs. 
The answer, of course, lies on the surface. As the tread wears out, the ability to drain water inevitably decreases, and consequently, the risk of stopping a few meters further than usual increases with wear. Also, one can't forget about aquaplaning. If you were driving calmly in the rain at a speed of 60-70 km/h on this vehicle, then as the tire wears out, it can easily aquaplane even at such a speed. 

However, there are plenty of improvements. 
Dry asphalt is directly proportional to the wet surface. There's more rubber in the contact patch, and consequently, the contact patch is more stable. That's why racing tires have such a massive amount of rubber and almost no water drainage channels. 
Also, the rolling resistance and noise level decrease significantly. The tire simply rolls easier when it has a smaller tread depth and makes less noise. 

Of course, the disadvantage of the tire's inability to maintain traction in the rain outweighs all the advantages. When switching to new tires, even of the same model, one should be prepared for an increase in fuel consumption and a less comfortable noise level.