More than narrow tread tires.
Minimum tread depth for all 4 tires is 2/32"
60% tread wear.
Many tires have tread wear indicator bars molded into the tread. When the tread is worn down to where you can see a solid bar of rubber across the width of the tread, it is time to replace the tire.
I assume you are referring to the tread. High grip will have a more aggressive tread design used in off-road conditions or in deep snow. They are called off-road tires or snow tires. The difference is in the tread design.
While it is good to use tires with the same tread and sizes, it is possible to use tires with different tread patterns, though you should be careful as the performance of the two tires may be different, causing your car to be unbalanced, endangering your passengers.
Because they have more tread.
Only aggressive tread new tires whine.
the tyres could blow and you may lose controle of your car
Slow down and make sure your tires have at least 2/32" of tread depth.
You can use a quarter to test tread wear on your tires. Insert the quarter into the tread grooves; if you can see the top of George Washington's head, your tread is too worn, and it's time to replace the tires. Ideally, you want the tread to cover part of the quarter, indicating sufficient depth for safe traction. Regularly checking your tire tread can help ensure safe driving conditions.
In the United States, the tread has to be 4/32 (3.17mm) or more on the front tires and 2/32 (1.58mm) or more on the back tires. rear tires can be retreaded but not the front "steer" tires.