This tyre pattern contains both asymmetric and directional features.
it is a tread
it is a tread
The tread of a tire or track refers to the rubber on its circumference that makes contact with the road. As tires are used , the tread is worn off , limiting its effectiveness in providing traction. A worn tire tread can often be retreaded. The word tread is often used incorrectly to refer to the pattern of grooves cut into the rubber . Those grooves are correctly called the tread pattern, or simply the pattern .
The pattern of the rubber part that meets the road.
Asymmetric
rubber with a tread pattern cut into in, available in black
Ones with a thick tread pattern.
No, it could be another asymmetric relation.
Hydroplaning occurs when the tires' tread is unable to expel enough water to maintain a rubber contact patch on the road. The function of tread is to allow the "high" part of the tread pattern to cut through by forcing water (and other road grit) into channels and grooves surrounding the tread blocks. When the water gets too deep for the tread grooves to cut through it and force it between the tread blocks, the "high part" of the tread blocks lose contact with the pavement and looses traction by hydroplaning.
Quite possibly you have tread separation. The outer layer with the tread pattern is separating from the core. This is a serious problem, you need to replace the tire.
The "tread" is the part of the tire that is supposed to touch the ground. A tire with no tread would be a tire that is not supposed to touch the ground. You may be wondering why tires have a pattern of grooves (a.k.a., voids) in the tread. They're for bad weather. The grooves allow rain, and (if they're wider) mud and snow to squelch out from under the tire so that the tread can come into contact with something solid on which to get a grip.