Flat spotting is a localized area with a different radius, stiffness or tread depth from the rest of the tire.
Flat spotting is a localized area with a different radius, stiffness or tread depth from the rest of the tire.
A parked tire can temporarily retain a shape when cold and recover after warming. A skid, impact or structural change can create a permanent condition that remains hot and may show visible tread loss.
Balance corrects mass distribution; it cannot restore missing tread or a permanently changed radius. Do not add excessive weight to mask a shape problem.
Temporary shape set may need only verification. Persistent flat spotting, excessive runout, exposed reinforcement or unacceptable vibration can require tire replacement and correction of the initiating vehicle condition.
What the finding means
A parked tire can temporarily retain a shape when cold and recover after warming. A skid, impact or structural change can create a permanent condition that remains hot and may show visible tread loss.
Balance corrects mass distribution; it cannot restore missing tread or a permanently changed radius. Do not add excessive weight to mask a shape problem.
Possible contributors
A visible pattern or measured condition is evidence, not proof of one component failure. Compare all tire positions and combine the tire findings with pressure, alignment, wheel-end and service-history data.
| Condition to consider | Role | Verification |
|---|---|---|
| Long parking or storage in cold conditions | Possible contributor | Verify with measurements and vehicle history |
| Wheel lock-up or skid event | Possible contributor | Verify with measurements and vehicle history |
| Brake or control-system fault | Possible contributor | Verify with measurements and vehicle history |
| Impact or structural uniformity change | Possible contributor | Verify with measurements and vehicle history |
| Wheel mounting or runout issue | Possible contributor | Verify with measurements and vehicle history |
Workshop inspection procedure
- Ask when vibration occurs and whether it fades warm
- Mark the tire-to-wheel position
- Inspect and measure the full circumference
- Measure radial runout and balance
- Check brakes after unexplained abrasion
Pressure, tire position, measurements, photographs and vehicle condition should be recorded before correction. That evidence makes the recommendation understandable and supports future comparison.
Service decision and follow-up
Temporary shape set may need only verification. Persistent flat spotting, excessive runout, exposed reinforcement or unacceptable vibration can require tire replacement and correction of the initiating vehicle condition.
Inspect the opposite tire and the other axle before finalizing the recommendation. When corrective work is performed, set a verification point so the workshop can confirm that new wear is no longer progressing abnormally.
Tread depth does not override a bulge, exposed reinforcement, suspected separation, severe run-flat history or damage outside an approved repair procedure.
Frequently asked questions
Can flat spotting be temporary?
Yes. Some tires develop temporary stiffness after parking and smooth out as they warm. Persistent vibration requires further inspection.
What can cause permanent flat spots?
Severe braking, long storage under load, tire damage or construction changes can create persistent radial variation.
Can balancing correct a flat-spotted tire?
Balancing does not remove radial shape variation. Measure runout and evaluate the tire and wheel assembly.
What should be checked after long vehicle storage?
Check pressure, visible deformation, age, cracking and vibration during a controlled road test.
Technical review edition · Published 17 July 2026.