Start with the signs that change the decision fastest

Inspect the tire in good light with the vehicle parked safely. Do not crawl under a vehicle supported only by a jack.

  • Look at the outer sidewall, tread grooves, and as much of the inner sidewall as you can see safely.
  • Check for cuts, splits, exposed cord or fabric, bulges, bubbles, or tread separation in addition to small cracks.
  • Measure cold tire pressure and note whether the same tire repeatedly loses air.
  • Find the DOT Tire Identification Number and read the manufacture week and year.
  • Compare all four road tires and the spare because low-mileage vehicles can age several tires at the same time.
  • Check the vehicle and tire manufacturer’s age-inspection or replacement guidance rather than relying on tread depth alone.

Tread remaining does not prove the rubber is still young

Tires change with time, heat, sunlight, ozone exposure, storage conditions, inflation, and load. A weekend car, RV, collector vehicle, or second vehicle can have plenty of tread while the rubber has spent years cycling through summer heat and long periods of sitting. NHTSA specifically treats aging as a separate issue from tread wear and lists cracks, cuts, bulges, and other physical damage as reasons a tire may need to be removed from service.

The DOT date code is useful context, not a stand-alone pass or fail test. Some vehicle and tire manufacturers publish age-based inspection or replacement recommendations, and those recommendations are not identical. Use the date together with condition, pressure history, storage, climate, and the manufacturer’s guidance.

Not every line in the rubber means the same thing

Fine surface weather-checking
Early age-related changes that appear shallow and do not expose reinforcement

This still deserves closer inspection, especially on an older tire or before a long, hot highway trip. Surface appearance alone cannot tell you the tire’s internal condition.

Deep or spreading cracks
Cracks that open visibly, repeat around the sidewall, enter tread grooves, or appear to reach deeper layers

Treat these as more concerning than cosmetic surface marks and have the tire inspected before continued high-speed use.

Bulge, exposed cord, split, or pressure loss
Signs that can indicate structural damage or loss of containment

Do not treat these as ordinary dry rot. Avoid driving farther than necessary for safety and use roadside service or the approved spare procedure when appropriate.

Stop and get help

Do not try to hide structural tire damage with dressing or sealant

A shiny tire dressing cannot restore aged rubber, and puncture sealant does not repair cracked sidewalls, exposed reinforcement, or a bulge. If the tire has a split, visible cord or fabric, a bubble, rapid pressure loss, or other obvious structural damage, do not use cosmetic treatment as a reason to keep driving. Have the tire professionally inspected and replaced when required.

Before a long Interstate trip, make the decision in this order

  1. 01
    Document the age and condition

    Read the DOT date, take clear photos of the cracks, and note any pressure loss or vibration.

  2. 02
    Check the manufacturer guidance

    Use the vehicle owner’s manual and tire manufacturer information for age-related inspection and replacement recommendations.

  3. 03
    Get a tire inspection if the cracks are more than superficial

    A shop can inspect areas that are difficult to see on the vehicle and look for related damage or abnormal wear.

  4. 04
    Replace as a matched fitment when needed

    Match the required size, load capacity, speed rating, and vehicle-specific replacement rules. AWD vehicles may also have tread-depth matching limits.

  5. 05
    Recheck the spare

    A spare can be older than the road tires because it may have spent years unused. Do not assume unused means fresh.