Like engine and other parts of vehicles the tyres are also important and in my opinion, not important but the most important as they face more beat than any other part. They are of various types such as winter tyres, summer tyres, all-terrain tyres and all-season tyres, etc. In this article, however, we are going to focus on one of the aspects of the tyres and that is about what tyre ply and ply rating is.
Over the course of time, the boost in the technology, Science, and Alchemy has even monopolized the automobile industry as well, and there has been quite an improvement in the manufacturing of tyres. The tyre is not just a mere rubber that is carved in a circle instead they are manufactured with the several layers of the rubber, cords of the steel and polyester and even other textile materials which are inlaid with the layers of the rubber and finally given a one-piece shape, i.e., tyres. These thin layers of the tyre are called ply.
Ply rating or load range is the number of the layers of the rubber on the tyre. They are mentioned on the side of the tyre and can tell how much load a tyre can bear at a specific inflation pressure.
Mostly, a common one is eight ply. Eight-ply means that a tyre has eight layers of the rubber. The ply rating can be same, or it can be different, in case of same let’s say if there are eight plys in the tread of the tyre then the side wall will also have the eight ply. However, in case of different ply rating, there would be different ply rating in the tread of the tyre and on the side wall as well. This can be further explained that a regular car and a light tyre have a four plys under the tread and two plys on the side walls. This kind of tyre will be 4+2 ply tyre and comes under that category of ply rating which has a different ratio of tread and sidewall ply. Now the question arises that why mostly there are more plys under the tread while less on the side wall? The answer to this is that this ratio or difference allows the strength while keeping flexibility in the sidewalls.
Higher the number of the ply is an advantage for a vehicle. The higher ply rating indicated that the tyre could bear this much load and greater the ply number then again greater the load range. However, one thing needs to be clarified that it doesn’t not necessarily means that if a tyre is six ply, then it has six layers of rubber rather it means that the tyre has a strength of the six ply. The table at the below will further explain this phenomenon.
That’s is from our side, drop your thoughts in the comments section below.