INNER LINER
The days of tubed tires are over. Today's modern tires utilize synthetic rubber instead—specifically butyl rubber*—which is virtually impenetrable to water and air.
However, over time, there will be slight air loss, so check your pressure every month.
CROWN PLIES (OR BELTS)
Crown plies provide the rigid base for the tread.
TREAD
The tread provides traction and cornering grip for the tire and is designed to resist wear, abrasion and heat.
CARCASS PLY
The carcass ply is the layer above the inner liner and consists of thin textile fiber cords (or cables) bonded into the rubber.
These cables are largely responsible for determining the strength of the tire.
BEADS
The beads clamp firmly against the tire's rim to ensure an airtight fit and keep the tire properly seated on the rim.
SIDEWALL
The sidewall protects the side of the tire from impacts with curbs and the road.
This is where the important details about the tire can be found, such as tire width and speed rating.
Related pages
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TIRE SPEED RATING & TREAD LIFE
The most common tire speed ratings, speeds and vehicle usage are as follows:View more -
READING A TIRE SIDEWALL
A tire’s sidewall is pretty much what it sounds like – the outer and inner “walls” on the sides of a tire, if facing a tire on its side. Every sidewall has its own unique information that is divided into four main sections:View more -
THE RIGHT TIRE FOR YOUR VEHICLE
Your correct tire size and tire pressure can be found in your vehicle’s owner's manual in the glove compartment or on the OEM sticker on your driver’s side door.View more