11 Signs and Symptoms of Bad Tires to Watch

A tire may look fine from a few feet away, yet feel completely different once you reach highway speed or drive through heavy rain. Perhaps the steering wheel has started shaking, one tire keeps losing air, or your truck no longer feels steady while towing.

Knowing the signs and symptoms of bad tires helps you act before a small tire problem becomes expensive damage or leaves you stranded.

The clearest signs of bad tires include low tread, uneven wear, cracks, bulges, exposed cords, repeated pressure loss, vibration, unusual noise, pulling, and weaker grip on wet roads. A tire with a bulge, exposed cords, serious sidewall damage, or tread separation should not remain in normal service.

1. The Tread Has Reached Its Wear Bars

Tread grooves give water somewhere to move when a tire rolls across a wet road. As those grooves become shallow, the tire has less space to channel water away from the contact patch.

The National Highway Traffic Safety Administration says tires should be replaced when tread depth reaches 2/32 of an inch. Tires have raised treadwear indicators inside their main grooves. When the surrounding tread sits level with those bars, the tire has reached its wear limit.

You can check tread in three ways:

• Use a tread-depth gauge.
• Look for wear bars across the grooves.
• Place a penny into the tread with Lincoln’s head facing down. If you can see the top of his head, the tread is around or below 2/32 inch.

Measure several locations across each tire. A tire may have acceptable tread in the center but be worn out along an inner shoulder that is difficult to see.

Tread depth tells you how much usable rubber remains. It is different from the UTQG number printed on some tires. Our guide to tire treadwear ratings explains what those ratings can, and cannot, tell you about expected wear.

2. One Part of the Tire Is Wearing Faster

Uneven tread wear often points to pressure, alignment, balance, or suspension problems.

• Wear on both outer shoulders: Often linked to underinflation.
• Wear through the center: May result from excessive tire pressure.
• Wear on one edge: Commonly caused by poor alignment or worn suspension parts.
• Cupped or scalloped patches: May indicate wheel imbalance, worn shocks, or loose suspension parts.
• Feathered tread: Often linked to incorrect toe alignment.

Always use the pressure listed on the vehicle placard or in the owner’s manual.

Do not install a new tire without correcting the cause. Otherwise, the replacement may develop the same damage. Regular tire rotation can help reduce position-related wear, but rotation cannot correct a damaged suspension or bad alignment.

3. Cracks Are Appearing in the Sidewall or Tread

Small surface lines can develop as rubber ages and faces heat, sunlight, ozone, temperature changes, and long periods of parking. Deep, widespread, or growing cracks deserve more concern because they may indicate that the rubber has lost flexibility.

Inspect the area:

• Between tread blocks
• Around the sidewall lettering
• Near the bead where the tire meets the wheel
• Inside the wheel well
• On the inner sidewall, not just the visible outer side

A tire can age even when it has plenty of tread. Michelin recommends annual professional inspections once a tire has been in service for five years and replacement by ten years from its manufacture date as a precaution. Vehicle manufacturers may set an earlier limit, so their guidance takes priority.

You can read the tire’s age from the final four digits of its DOT code. For example, 2524 means the tire was made during the 25th week of 2024.

Age alone does not reveal every tire’s condition, but old age combined with cracking, pressure loss, vibration, or poor grip gives you several reasons to arrange an inspection.

4. There Is a Bulge, Bubble, or Blister

A sidewall bulge forms when the tire’s internal structure has suffered damage and air pressure pushes the outer rubber outward. This can happen after hitting a pothole, curb, road debris, or another sharp impact.

A bulge is not a cosmetic flaw. It can indicate separation or broken reinforcement inside the tire body. Bridgestone advises drivers to have bumps and bulges inspected because they may signal internal separation.

Do not:

• Push the bulge back into place.
• Cover it with a patch.
• Keep driving because it looks small.
• Assume adding or removing air will correct it.

Reduce unnecessary movement of the vehicle and arrange for the tire to be replaced or professionally assessed.

5. Cords or Wires Are Showing

If you can see fabric cords or steel wires through the tread, the tire has worn beyond its usable rubber.

This commonly appears after:

• Severe alignment wear
• Long-term underinflation
• A tire rubbing against a body or suspension part
• Continued use after the tread reached its wear bars
• Overloading or running the tire while nearly flat

An exposed cord means the tire’s reinforcing structure no longer has proper protection from road contact, moisture, and impact. Do not continue using the tire for regular driving.

Also inspect the wheel well and suspension before replacing it. A new tire may suffer the same damage if rubbing or alignment caused the original wear.

6. The Tire Keeps Losing Air

A tire that needs air every few days or weeks has a leak, even when you cannot see a nail.

Possible leak points include:

• A tread puncture
• A damaged valve stem
• A leaking valve core
• Corrosion or debris around the wheel bead
• A cracked wheel
• Sidewall damage
• A previous repair that no longer seals
• Damage caused by driving underinflated

Check tire pressure before driving or after the vehicle has been parked for at least three hours. Use the pressure listed on the door placard or in the owner’s manual.

Do not rely only on the TPMS, as it may not warn you until the pressure is already quite low. Small tread punctures may be repairable, but sidewall damage, large holes, or damage caused by driving flat usually requires tire replacement. 

For more detail, see our guide to finding and maintaining the correct tire pressure.

7. The Vehicle Shakes or Vibrates

A steering-wheel shake, seat vibration, or pulsing sensation may become noticeable at a certain speed.

Possible causes include:

• An unbalanced tire-and-wheel assembly
• A bent wheel
• Uneven or cupped tread
• A tire that has developed an out-of-round shape
• Internal belt damage
• Loose wheel hardware
• Worn steering or suspension parts

Vibration does not automatically prove that a tire is bad. However, vibration may come from misalignment or a bent rim and may also signal tire damage.

Pay attention to where you feel it:

• Mostly through the steering wheel: The problem may involve a front tire or wheel.
• Mostly through the seat or floor: A rear assembly may be involved.
• Only while braking: The brakes may contribute.
• Only at a narrow speed range: Balance or tire uniformity may be involved.
• A sudden new vibration: Stop and inspect for pressure loss, tread damage, or a loose wheel.

Do not continue at highway speed when a new or strong vibration appears. Slow down smoothly and have the vehicle checked.

8. You Hear Humming, Thumping, or Slapping

Tires naturally create some road noise, especially aggressive all-terrain and mud-terrain designs. The concern is a sound that is new, becomes louder, or changes with vehicle speed.

A steady hum may come from cupped or feathered tread. A repeating thump may point to a flat spot, separated area, damaged tread, or tire that is no longer round. A slapping sound can occur when part of the tread begins coming loose.

Pull over safely when the sound starts suddenly or comes with vibration, steering movement, or visible damage.

Do not diagnose the tire by sound alone. Wheel bearings, brakes, suspension components, and road surfaces can create similar noises.

9. The Vehicle Pulls to One Side

A vehicle that drifts or pulls on a straight, level road may have:

• Unequal tire pressures
• Uneven tread depth
• A damaged or defective tire
• Incorrect wheel alignment
• Brake drag
• Worn steering or suspension parts
• Different tire constructions or sizes

Check cold pressure on both sides first. If the readings match the vehicle specification and the pull continues, arrange an alignment and tire inspection.

NHTSA explains that proper alignment helps prevent a vehicle from veering left or right and supports longer tire life.

Never correct a pull by randomly changing pressure on one side. That may hide the symptom while creating a new inflation problem.

10. Wet-Road Grip Has Become Noticeably Worse

A driver may first notice a worn tire during rain rather than on dry pavement.

Warning signs include:

• The tires spin more easily from a stop.
• Anti-lock brakes activate during ordinary wet stops.
• The vehicle slides sooner during turns.
• Steering feels light over standing water.
• The rear of the vehicle moves more than expected.
• Stopping requires more space.

Shallow tread cannot move water away as effectively, increasing the risk of hydroplaning and reduced steering or braking control.

Poor wet grip may also result from hardened rubber, incorrect pressure, unsuitable tires, high speed, or deep standing water. Check the tread and inspect all tires.

Our guides to tire traction ratings and hydroplaning explain how tire ratings, tread, speed, and water affect wet-road performance.

11. The Tire Has Cuts, Punctures, or Missing Tread

Road debris can cause damage that ranges from a repairable puncture to a structurally unsafe tire.

Inspect the tire for:

• Deep cuts
• Torn tread blocks
• Missing pieces of rubber
• Objects lodged near the shoulder
• Damage where the tread meets the sidewall
• Separation between tire layers
• Scrapes that expose reinforcement
• Damage near the bead

A screw in the center tread does not always mean the tire is ruined. A technician may be able to repair it after checking the puncture size, location, angle, remaining tread, and internal condition.

Damage near the shoulder or sidewall causes more concern because those areas flex as the tire rolls. An external plug alone also does not show whether the inside of the tire suffered damage while pressure was low.

Should You Replace One Tire or the Full Set?

Replacing one tire may be suitable when the others are fairly new and closely match its size, tread depth, construction, and load rating.

Replace a pair or full set when several tires are worn, cracked, unevenly worn, or no longer meet drivetrain requirements. AWD vehicles and dually pairs may require closely matched tread depth and overall diameter.

Dually Wheels carries vehicle-specific tires and wheels, but fitment should always match the vehicle manufacturer’s requirements and the truck’s real load.

Conclusion

Bad tires usually give visual or driving clues before they become completely unusable. Check pressure, tread, sidewalls, age, and all six positions on a dually, then replace or inspect any questionable tire before the next highway trip or heavy tow. 

For properly matched replacements and fitment guidance, review the tire and wheel options available through Dually Wheels.

Frequently Asked Questions

Can bad tires cause a car or truck to shake?

Yes. Uneven wear, internal damage, flat spots, or an out-of-round tire can cause shaking. Wheel imbalance, a bent wheel, alignment, brakes, and suspension parts can create similar symptoms, so a technician should inspect the full assembly.

Is a tire bad if it keeps losing pressure?

A repeating pressure loss means the tire-and-wheel assembly has a leak. The cause may be a repairable tread puncture, but it may also involve the valve, wheel bead, rim, sidewall, or internal damage. Have it tested rather than repeatedly adding air.

How often should I inspect my tires?

NHTSA recommends checking tread and pressure at least once a month. Inspect them again before long trips and after striking a curb, pothole, or road hazard.