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Why Do Tires Have Those Little Hairs?

Summary:

Those tiny rubber things sticking out on new tires are a common sight, but have you ever wondered what they are and why they exist? Known as vent spews, these hairs are byproducts of the tire manufacturing process and reveal useful information about a tire’s condition.

What Are Tire Hairs?

Tire hairs, also called sprue nubs or nippers, form when molten rubber is pressed into a mold. Small vent holes in the mold allow air to escape, and the rubber pushes through these holes, creating hardened rubber hairs. All new tires have them, but their number and placement may vary.

Do They Matter?

These sprue nubs don’t affect tire performance and naturally wear off over time. Tread hairs typically disappear after about 100 miles of driving, while sidewall hairs can last much longer, depending on conditions like dirt, snow, or abrasion. Their presence often indicates a tire’s relative newness.

Signs of Tire Wear

When sidewall hairs are gone, it often suggests significant usage. However, worn sprue nubs alone don’t mean the tire is unfit for use. Look for deeper indicators like shallow treads, visible cracks, uneven wear, or exposed steel bands to assess a tire’s condition.

Tire Care Tips

Dealers often clean tires using soap, water, or commercial products like Tire Bright to enhance their appearance. Avoid using harmful chemicals like disinfectants unless under specific circumstances, such as preventing disease spread in unique environments.

By understanding tires and monitoring wear, you can better evaluate a tire’s condition and make informed decisions when purchasing or maintaining tires.
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