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Radial Bias

Pneumatic tires rely on high pressure air to support vehicle loads, with insufficient air leading to potential tire failure. There are two main types of tires: bias ply, which have layers that intersect at right angles and tend to wear faster, and radial ply, which have straight body plies that enhance stability and fuel economy. Proper inflation and inspection are crucial, especially for heavier tires, to prevent issues like zipper ruptures during inflation.

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10 views1 page

Radial Bias

Pneumatic tires rely on high pressure air to support vehicle loads, with insufficient air leading to potential tire failure. There are two main types of tires: bias ply, which have layers that intersect at right angles and tend to wear faster, and radial ply, which have straight body plies that enhance stability and fuel economy. Proper inflation and inspection are crucial, especially for heavier tires, to prevent issues like zipper ruptures during inflation.

Uploaded by

gauravtekwani
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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RADIAL AND BIAS PLY Tire Construction Basics Tread Cap Tread Crown Shoulder Shoulder It is important

to understand that pneumatic tires are high pressure air containers and the air inside of the tire is what
supports the load of the vehicle, not the tire itself. If a tire does not have enough air pressure for the
load being carried, the tire will over flex and likely fail. When dealing with light truck (LT), medium and
heavy truck tires with steel body plies it is also important to understand that when these tires are
operated in an under inflated or overloaded condition, the tire may be susceptible to a zipper rupture
during the inflation process and additional inspection of the tire is required. When inflating a tire, the
tire must be strong enough to contain the inflation pressure. Due to this pressure, tires are reinforced
with either fabric or steel body plies that wrap around the bead bundle. The bead bundle is a steel wire
hoop that holds the tire firmly against the rim and prevents the tire from leaking or slipping. Currently,
there are two types of tires in production: bias and radial ply. Bias ply tires have body plies that wrap
around one bead and run diagonally across the tire and wrap around the opposite bead. Bias tires will
always have at least two layers of body plies that wrap around the tire in alternating directions and
intersect in the crown at nearly a right angle. The nature of the flexing of bias tires allows for greater
distortion in the tread area, typically leading to a faster wear rate than radial tires, as well as lower fuel
economy. Radial tires have body plies that run straight across the tire at a 90-degree angle to the beads.
Passenger and many LT tires typically utilize fabric cords such as polyester, while some larger LT tires,
medium, or heavy truck tires are made with a single ply of steel cords. Underneath the tread are
multiple layers of belts consisting of fabric and/or steel cords to help stabilize the tire. These belts allow
the tread to maintain even contact with the road surface, which leads to longer tread life and better fuel
economy.

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