Q: What Are The Little Rubber Hair On New Tires?

asked by on November 12, 2015

What are the little rubber hairs on new tires?

Purchasing a new set of tires can be an exciting moment, though it may take some time for the sticker shock to wear off. You may have chosen the tires for your car based on cost, performance, or simply because of the look of the tire. When looking at your new tires you may notice a few things about them that seem odd. There are some characteristics of new tires that may have you asking why they are there.

When first looking at the tires you may notice little hair-like pieces of rubber protruding from them. These are typically seen on the sidewall of the tires, but they can also be found on the tread in many cases. Some people become confused as to why these are there and what their purpose is. The fact is that they do not serve any purpose whatsoever. These little rubber hairs are the remnants of the tire making process.

When tires are constructed, their inner carcase is first made. This is made of a series of steel belts and a steel bead which may also be coated with other metals to protect them from corrosion. Once the inner construction of the tire is built the rubber is molded to it. The inner makings of the tire are placed in a mold that typically consists of two sides pressed together. Once the mold is closed there are small holes that the liquid rubber is injected into. This rubber makes its way into mold and fills all of the empty space until the tire shape and construction is achieved. Once the rubber cools and solidifies the two sides of the mold are separated and the tire is removed.

The hairs that are on the tire are what remain from the small holes in the mold that the rubber is injected into. Many times you can also see a small line in the tire molding from where the two sides of the mold come together also. Many tire manufacturers will grind or cut the hairs off, but some leave them. Some of them may be ¼” or less, while others can be 1” long. If you find these hairs on the tire there is no need to worry about them as they will not affect the tire, and in most cases they will wear off or fall off over time.

Many times you will also notice colored circles on the sidewall of the tires. These colored circles assist in the proper mounting of the tire to the wheel. When the tire is installed the colored circle should be moved until it aligns with the valve stem on the wheel. This matches the heavy spot on the tire with the lighter spot on the wheel. This makes it much easier to balance the tire and will result in a better ride over time.

When you purchase new tires there can be unexpected occurrences. These can be the result of choosing the wrong size tire or the wrong brand. Seeing some imperfections in the tire, such as the rubber hairs, is nothing to be alarmed of. Doing some research prior to purchasing a new set of tires can also give you a piece of mind that you are purchasing the right tires for your vehicle.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Engine knocking and engine light on

Hello. If the Check Engine Light is on, then it would help to know what codes are coming up. The computer codes would help a mechanic find a starting point to determine the problem. From the description of the problem,...

Noise when put into reverse

Hello.

Steering doesn’t work very well, bad on the highway

Before giving any diagnosis, I would first suggest that you have you car checked out as soon as possible since this could be a safety concern. If you feel it is unsafe to drive, YourMechanic can come to your home...

A/C makes loud humming sound

The blower fan motor has something caught in it or the air filter is not in position and hitting the blower fan. Have the person or shop that did the work fix it. The filter may be out of position...

my front passenger side is making a metal grinding type noise do i need bearings replaced or should i get a second opinion

Hello, the hub bearing could be failing. I would not drive the vehicle until it is inspected for the noise. This bearing is connected to your wheel and tire. If you'd like, a certified Your Mechanic Technician can come to...

Low air pressure symbol stays on after pressure has been corrected

Each tire has a pressure sensor in the tire that has a battery built into the sensor. These batteries will last about 5 to 7 years before the battery goes bad. The sensor will need to be replaced to correct...

Grinding noise and backfiring during startup

The starter on this vehicle requires a shim, so its possible that got left out when the starter was replaced. This could cause starter engagement problems and the metal on metal noise you're hearing. Backfiring, on the other hand, is...

Knocking sound and steering column vibration - 2005 GMC Sierra 2500

Without hearing or experiencing the noise myself, it is hard to make an accurately diagnose this but GM has a TSB (technical service bulletin) that may address this concern. There are 3 possible causes from a body mount at the...

My tire went flat. Loud screeching noise since putting on spare tire.

It's apparent due to timing that something to do with the new tire is your source for unwanted sound. Something is making contact to something else that it should not be. You need to start by removing the spare tire...

Related articles

How Do I Take Care of My New Tires?
You’ve You’ve equipped your car with a brand new set of tires, replacing the old set of worn out rubber. They were noisy, and every time you had to brake hard, you were losing traction. Now you’ve spent your hard-earned...
How Does My Car Monitor Tire Pressure?
You’re You’re driving home from work and your steering wheel begins to pull. It gradually gets worse, then you hear a thump-thump-thump noise. You stop on the side of the highway to investigate, only to find you’ve got a flat...
How Do I Make My Tires Last Longer?
When When you buy a new vehicle or a new set of tires for your current vehicle, there is nothing like the experience of a quiet drive and confident traction. Unfortunately, that experience doesn’t last forever. Road noise begins to...