After writing the “Understanding ATV Tires and Wheels” post I receive a couple of emails asking about ATV Tire Construction or more specifically radial vs. bias ply tires. To answer this one must have a better understanding of the differences between the two types. I found the following on the Carlisle Tires website which helps explain the two types.
Ply rating and the belt type construction each have an affect on the tire’s pliability, stability and handling characteristics.
PLY RATING
Years ago, a tire’s construction was rated by the number of plies (or layers) within the carcass. This rating system was used when less durable material, (such as traditional rubber) was used to create the tire carcass. Because the material was less durable, it took more layers of bonded, fused material to increase the tire’s strength and longevity.
However, with the advent of new technologies and materials, a tire can be constructed with only a few (2 or 3) plies of material, yet have the same strength and longevity of a 6- or 7-ply tire. Hence, a new tire may have a 6-ply rating (based on the old standards), yet be constructed with only a couple of layers.
RADIAL vs. BIAS PLY
Bias ply tires are constructed utilizing plies or belts (typically rubber-coated plies composed of textile cords, usually nylon) that run diagonally (usually 30 degrees) from one bead to the other. One ply is set on a bias in one direction, and succeeding plies are set alternately in opposing directions crossing each other
Radial tires are constructed in two parts. First, a single layer of rubber-coated steel cables arch from one bead to the other to form the tire casing. Second, numerous rubber-coated steel belts are placed in the crown, under the tread, to form a strong stabilizing unit. Radial construction makes the tire more flexible, which reduces rolling resistance and improves fuel economy.
Which tire construction is best for you?
Strike a good balance of ply ratings for your tire. Too large of a rating can mean a stiffer, less pliable carcass. Too weak of a rating can mean too soft of a carcass, a weaker tire, one more susceptible to punctures.
Good information from the Carlisle Tires website.
I mainly ride the back country trails of Colorado and from my experience for ATV technical riding on rocks and hills I require a tire with good side wall protection and flexibility but I also want a tire that preforms well on the trails. In my opinion a radial tire, 6 ply or more is the best for my type of riding.
For you, the best type of tire may be different. Talk with others that ride the same terrain and style as you. Make your own educated decision on the type of tire that is best for you..
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