Posted by David on December 22, 1997 at 07:05:58:
In Reply to: Number and composition of plys in tread and sidewalls posted by Byron on December 22, 1997 at 00:58:41:
That information is also available in the liturature most manufatuers put out on their tire as well as on the tire itself, so it more like the average tire dealer doesn't know where to look to find it, not that they don't have the information. What is your qiestion in realtion to? Years ago the number of plies was directly related to the load carrying capacity of a tire, but today that is not the case. The material the plies are constructed of and how they are then constructed can serve the same purpose that increasing or decreasing the number of plies in a tire. The purpose either way is to increase the strength of the tire for the amount of air in the tire, the air pressure inside the tire is what actualy determines how much and carries/supports the load. A basic passenger car tire usualy consists of: One or two "carcas" or body plies, usualy made of polyester. They make up both the side wall and tread ply count. Then the belt or breaker package, which usualy consists of one or two Steel belts, they would be part of the tread ply count. The most commonly found next eliment would be nylon over the steel belts, also in the tread ply count. The nylon "cap" is not usualy found until you get into higher performance tires or those needing extra durability.
Composition of the tread and sidewalls is completely another subject. Both issues do matter but are usualy beyond the technicle understanding the tire dealer thinks the consumer wants to know about a tire, and they are usualy right. Is a tire going to do what I need/want it two, is the limit of what anyone asks the person selling them the tires. But they are both directly related to how well a tire performs. Your best bet is to contact the manufactuer directly if you need more information than the local tire dealer can provide you.
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