The primary contributor of skin color is the pigment known as melanin. The quantity of melanin in the skin varies based on genetic factors and is also dependent on the degree of sun exposure. Melanin is produced by specialized pigment cells known as melanocytes.
Average new tires used on cars typically start with 10/32 to 11/32 of original tread depth. Tires are considered worn out. In most States when they reach 2/32 of remaining tread depth. Ans 2 - Here in Canada (and I'm sure in many parts of the US ) we get a lot of rain.
But age is not the only factor. Tread matters too. A worn tire can be just as dangerous, or even more so, than one that is simply old. While the minimum safe tire tread depth is 2/32â³, consider replacing your tires at the 4/32â³ mark, especially if you drive in rainy and snowy conditions.