How Two Hundred Different Components Become Tires

You live in the county seat of Pima County Arizona and are in the market for new tires. You pull into any one of the multiple places that offer tire service tucson az and select your new tires. Have you ever thought about how those tires are made? 

Anatomy of a Tire

The BEAD or lip of the tire is a rubber coated steel band that seals the tire to the wheel. The BODY of the tire is a is a combination of a special fabric and rubber. The SIDEWALLS hold the tires together and contain important information about the tire like the speed rating. STEEL BELTS in radial tires provide puncture resistance and help the treads maintain contact with the road. The grooves in the tire known as TREADS are an amalgam of natural and synthetic rubber.

The Banbury Mixer and Milling The Process

The creation of the compound that will become the tire are blended together using a Banbury mixing machine. There are 200 components, that go into making a single tire. The mixer turns these ingredients into a resin.

Making a tire requires seven gallons of oil. To make the tire producing process more eco-friendly manufacturers use isoprene. Derived from trees isoprene is a cleaner alternative to fossil oils.

During the milling process, the resin is cut into strips. Each of these strips will become a component of the tire. 

The Tire Building Machine

All of the components of what will become a tire are stacked together. 

  • Beads
  • Fabric
  • Rubber
  • Steel belts
  • Sidewalls
  • Treads


The layers of material (plies) are placed on a spinning drum. The pressure exerted by the machine bonds the layers together creating a cylinder the resembles a tire. At this point, the tire is classified as “green” because it is uncured and without recognizable tread. 

Imprinting Treads

The cylinder that was created on the tire building machine is placed in a mold. Once inside the mold air is pumped into the tire. This inflation exerts pressure against the inside of the die imprinting the tread pattern. During the tread molding process, the information contained on the sidewall is added. 

Curing the Tire

Depending on the size of the tire the curing process takes anywhere from 15 minutes to an entire day. The mold used to create the tread is heated to 300 degrees F. This process turns the rubber compound into rubber and strengthens the bond between the tire’s component materials. 

The Final Quality Inspection

tire uniformity test guarantees that the tire satisfies both industry and government standards. During this process, the tire is mounted to a wheel and rotated on a surface approximating a road surface. Called a force variation test this procedure tests how the tire will behave on an actual car. Before the final visual inspection, the balance of the tire is tested.

 

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