Why Do New Tires Have Rubber Hair on Them?

There are little rubber hairs that you see on every new tire. Technically, they are called vent spews, which gives away their purpose for being on the tire. Many people think these hairs play a role in noise reduction or indicate wear but their primary purpose is air ventilation.

Those little rubber hairs are a byproduct of tire manufacturing. In a tire mold, rubber is injected and air pressure is used to force the liquid rubber into all the nooks and crannies. In order for the rubber to completely fill the mold, small pockets of air need to be able to escape.

There are small vent holes in the mold so trapped air can find a way out. When the air pressure forces the liquid rubber into all the orifices, a tiny bit of rubber makes its way out of the vent holes as well. These rubber bits firm up and remain attached to the tire when it's removed from the tire mold.

Though they serve no purpose in your tire’s performance, the tire hairs' presence is an indication that a tire is new. Tires that have been in service for some time, coupled with environmental effects, will eventually wear off the hairs.


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

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

How to Fix a Flat Tire
Knowing how to fix a flat tire on a car is part of being a safe driver. Driving on flat tires is dangerous so it's smart to repair flat tires quickly.
How to Do a Tire Safety Inspection
Car tires are a big part of staying safe on the road. Check tire inflation, tread depth, and sidewalls to make sure they're in good shape.
3 Ways to Increase Your Car Tire Lifespan
Car tires last longer if you drive carefully and keep tires aligned and inflated. Regularly rotate car tires and check for signs of damage.

Related questions

Damaged suspension hitting curb
Generally, such collision repairs are performed by body shops but any certified mechanic will be able to inspect the front suspension (https://www.yourmechanic.com/services/brakes-steering-and-suspension-inspection) to find anything that has shifted with the accident. Any of the suspension components could be bent or...
severe steering wheel vibration at speeds above 60 mph, but not below 60, and severe vibration during braking.
If you can wiggle the tire side to side then you either have a problem with inner or outer tie rod ends (https://www.yourmechanic.com/services/tie-rod-end-replacement). You may have both of them that are bad. This will allow the side-to-side movement, but brake...
P0755 & P0700 error codes
The problem with buying used tires and not having them balanced is the potential problems they can cause. Most transmissions - or more specifically, the Powertrain Control Module (PCM) which controls the transmission and drive line - contain incredibly tight...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com