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LEARNING OBJECTIVES
LEARNING OBJECTIVES
Understand the role of tire tread in vehicle safety and performance, and learn how to inspect, interpret, and respond to various tread wear patterns.
By the end of this lesson, you should be able to:
Explain the importance of tire tread depth and describe how insufficient tread affects traction, hydroplaning risk, and braking distance.
Appreciate the importance of regular tire inspections and feel motivated to take proactive steps in ensuring tire safety and vehicle maintenance.
Demonstrate how to measure tread depth using a coin test or tread gauge, and inspect tires for visible wear or damage.
Tire tread plays a critical role in vehicle safety. It helps your tires grip the road, especially during rain, sudden braking, or on slippery surfaces. As tread wears down, the tire loses its ability to maintain traction, increasing the risk of hydroplaning and long stopping distances (Bridgestone, n.d.).
When your tires are bald or unevenly worn, you’re not just risking your safety, you’re also putting more strain on your vehicle’s systems.
UNDERSTANDING TREAD DEPTH
UNDERSTANDING TREAD DEPTH
Tread depth refers to the distance between the top of the rubber tread and the bottom of its deepest grooves.
Most road safety laws require tires to have a minimum tread depth of 1.6 mm. Once tread falls below this, it’s time to replace your tires.
WHY TIRE TREAD IS IMPORTANT?
WHY TIRE TREAD IS IMPORTANT?
Prevents hydroplaning by channeling water away from the tire.
Improves grip on wet, icy, or gravel roads.
Reduces braking distance.
HOW CAN YOU MEASURE IT?
HOW CAN YOU MEASURE IT?
TREAD DEPTH GAUGE
TREAD DEPTH GAUGE
A small tool that gives an accurate reading of your tread depth.
A small tool that gives an accurate reading of your tread depth.
THE COIN TEST
THE COIN TEST
Insert a 1-peso coin into the tread, with José Rizal’s head facing down.
Insert a 1-peso coin into the tread, with José Rizal’s head facing down.
If the hairline on his head is visible, the tread is less than 1.6 mm and the tire should be replaced. (Tire Discounters, n.d.).
If the hairline on his head is visible, the tread is less than 1.6 mm and the tire should be replaced. (Tire Discounters, n.d.).
TYPES OF TIRE WEAR
TYPES OF TIRE WEAR
Tire wear isn't always even. The way your tire wears can tell you a lot about how your vehicle is being maintained.
CENTER WEAR
CENTER WEAR
The middle of the tire tread wears down faster than the edges. This results in a flat strip running down the center, while the outer areas appear less affected.
CAUSES:
CAUSES:
Overinflation: Too much air causes the tire to bulge outward, concentrating pressure on the center.
Improper Wheel Alignment: When alignment is off, the center tread may carry more of the load than intended.
SOLUTION:
SOLUTION:
Check and maintain tire pressure according to your vehicle’s recommended PSI (found on the driver-side door frame or owner’s manual).
Have your wheel alignment checked during routine servicing, especially if you notice steering issues.
EDGE WEAR
EDGE WEAR
The outer shoulders (edges) of the tread are worn more than the center, often appearing rounded or smoothed out.
CAUSES:
CAUSES:
Underinflation: When tires lack sufficient pressure, they sag, causing the edges to absorb more stress.
Aggressive Driving: Taking sharp turns or cornering too fast can wear down the shoulders quickly.
SOLUTION:
SOLUTION:
Inspect tire pressure at least once a month and inflate to proper levels.
Adopt smooth driving habits—avoid fast cornering and sudden lane changes.
CUPPING OR SCALLOPED WEAR
CUPPING OR SCALLOPED WEAR
This wear appears as dips or “cups” around the tire surface. It’s often accompanied by a rhythmic thumping noise while driving.
CAUSES:
CAUSES:
Worn Suspension (e.g., shocks or struts): When suspension parts fail to absorb road impact, the tire bounces slightly, causing irregular wear.
Unbalanced Tires: If weight isn’t evenly distributed, tires can wear in patches.
SOLUTION:
SOLUTION:
Replace damaged or worn suspension components promptly.
Have your tires balanced and rotated regularly—ideally every 8,000 to 10,000 kilometers.
CAMBER WEAR
CAMBER WEAR
One side of the tread wears more than the other, creating a wedge-like or slanted appearance across the tire.
CAUSES:
CAUSES:
Improper Camber Angle: Camber is the tilt of the wheel relative to vertical. If it’s too positive or negative, the tire leans and wears unevenly.
Worn Suspension Components: Damaged control arms, bushings, or struts can throw off alignment and camber angle.
SOLUTION:
SOLUTION:
Get a suspension and alignment inspection. Mechanics can check for leaking struts, worn bushings, or loose bolts.
Fix or replace components before tire damage becomes severe.
WHEN TO REPLACE YOUR TIRE
WHEN TO REPLACE YOUR TIRE
Even if a tire isn't completely bald, it may still be unsafe. Here are signs it’s time for a replacement:
Tread depth is less than 1.6 mm.
Visible signs of damage, like:
Cracks or bulges
Cuts or punctures
Exposed cords or threads
Uneven wear that indicates deeper mechanical issues.
Age of tire: Most manufacturers recommend replacement after 6 years, even if tread appears okay.
REAL WORD TIP: If you notice any unusual vibrations while driving or hear thumping noises from your tires, it could be a sign of uneven wear. Don’t wait for a tire to go bald—these warning signs help prevent blowouts and accidents.
SUMMARY
SUMMARY
Understanding tire tread and wear is essential for every vehicle owner. Proper tread depth ensures grip and safe handling, especially in challenging driving conditions. Meanwhile, recognizing wear patterns like center wear, edge wear, cupping, and feathering helps identify underlying issues like incorrect inflation, alignment problems, or worn-out suspension components. By regularly inspecting tread and addressing uneven wear early, you not only enhance driving safety but also extend the life of your tires and improve overall vehicle performance.
Want to make your tires last longer? Discover how treadwear affects tire lifespan and what you can do to maintain them in this insightful video: "Tire Treadwear and Life Span Explained."
Want to make your tires last longer? Discover how treadwear affects tire lifespan and what you can do to maintain them in this insightful video: "Tire Treadwear and Life Span Explained."
Tread Carefully, Literally!
Tread Carefully, Literally!
Uneven wear, low depth, bald spots do you know what they mean? Take this quick quiz and see how tread-smart you are when it comes to tire safety.
Uneven wear, low depth, bald spots do you know what they mean? Take this quick quiz and see how tread-smart you are when it comes to tire safety.
LIST OF SOURCES USED IN THE THIS WEBPAGE
LIST OF SOURCES USED IN THE THIS WEBPAGE
Bridgestone. (n.d.). Causes of tire tread wear. Bridgestone Tire. https://www.bridgestonetire.com/learn/maintenance/tire-tread-wear-causes/
Tire Discounters. (n.d.). Tread wear education. https://www.tirediscounters.com/services/tires/tire-education/tread-wear
Tire, C. (2024, September 4). Tire Wear Patterns: What your tires could be telling you. Commercial Tire. https://commercialtire.com/blog/tire-wear-patterns-what-your-tires-could-be-telling-you/
Mike’s Auto Clinic. (2021, November 15). Tire treadwear and life span explained [Video]. YouTube. https://www.youtube.com/watch?v=f7dGO42R834
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