Have you ever noticed the rubber nubs covering most of the tires on your car? These “tire hairs” are a mystery to some while sensible to those in the tire industry. If you’re wondering whether or not these little rubber hairs have a purpose, are supposed to be on your tires, or have an official name, we’ve got the answers for you.

Why do tires have small rubber hairs covering them?

cars, maintenance, tires, why do tires have hairs?

Tire Hairs on a Goodyear Tire | Wikimedia Commons

The rubber hairs on tires are a product of the manufacturing process. Before the tire is shaped and marked, its placed into a tire mold. The rubber is heated and expands to fill the mold and take on the tread pattern. This process presents a rise of air bubbles forming between the rubber and the mold, which would prevent the tire from forming correctly.

To fix the problem with air bubbles, tire manufacturers add small holes in the mold to allow the excess air to escape from the mold. When this air escapes, the air and a small amount of rubber escape out of these holes, creating the small nubs you see on the tires.

Do these tire hairs have an official name?

Although tire hairs sounds a lot more friendly than the official name, these little rubber nubs are called tire vent spews. Other names used for these items are sprue nubs, tire nibs, gate marks, or nippers.

What are some common misconceptions about the rubber hairs on tires?

cars, maintenance, tires, why do tires have hairs?

Tire Vent Spews | Wikimedia Commons

Some people believe the tire vent spews impact your driving performance, tell about the age of a tire, or have other misconceptions about these little items. Toyo Tires tells us some of the common myths associated with them are:

  • They are a good way to check the age and condition of a tire
  • They need to be removed
  • They should never be removed
  •  They are ugly

All of these are misconceptions and not to be believed. Of course, the ugly part is subjective.

Should you remove tire vent spews from your tires?

Now that we’ve answered why do tires have hairs, the next logical question is whether or not they should be removed. This is entirely a matter of personal preference and taste. The tire vent spews serve no practical purpose once the tire is out of the mold during manufacturing.

If you want to remove them, it’s best to do so with your hands, which some people find to be very therapeutic.

What does a tire date code tell you?

cars, maintenance, tires, why do tires have hairs?

Tire Date Code Example | Wikimedia Commons

Let’s add another piece of tire information with something that actually matters. Tires have date codes that tell you when the tire was made. The last four numbers represent that date. The first two numbers in a tire date code indicate the week, and the last two the year. An example would be a date code of 2910 which indicates a tire was manufactured during the 29th week of 2010.

Most manufacturers recommend driving on tires that are less than six years old. This means tires have a date code for when they were made and an expiration date of six years from said date.

Next, learn if Wal-Mart has free air for your tires, or learn more about how tires are made in this video below:


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