Tire Conditions

In Center

Tread Wear

tire-condition


Probable Cause

  • Tires overinflated
  • Use of oversized tires

Appropriate Correction

  • Confirm cold inflation pressure matches vehicle’s recommended pressures
  • Confirm appropriate rim width and evaluate alternate tire pressures

On Both Shoulders

Tread Wear

tire-condition


Probable Cause

  • Tires underinflated
  • Vehicle overloaded

Appropriate Correction

  • Confirm cold inflation pressure matches vehicle’s recommended pressures
  • Confirm load being carried is within vehicle specifications, reduce as necessary

On One Shoulder

Tread Wear

tire-condition


Probable Cause

  • Wheel alignment does not match actual driving conditions
  • Worn or amaged steering/suspension parts

Appropriate Correction

  • Set alignment to most appropriate angles within vehicle’s approved range
  • Replace worn or bent parts and align

Heel and Toe Block Wear

Tread Wear

tire-condition


Probable Cause

  • Insufficient tire rotation for driving conditions
  • Tires underinflated, increasing drag and wear

Appropriate Correction

  • Rotate tires more frequently following vehicle’s approved pattern
  • Confirm cold inflation pressure matches vehicle’s recommended pressures

Irregular Cupping

Tread Wear

tire-condition


Probable Cause

  • Loose steering or suspension components
  • Tires and wheels out of balance

Appropriate Correction

  • Replace worn struts/shocks and other steering/suspension parts and align
  • Correct balance of tires and wheels

Circumferential Split/Star

Sidewall

tire-condition


Probable Cause

  • Impact break from road hazard or pothole
  • Tire sidewall pinched between road and wheel

Appropriate Correction

  • Dismount tire and inspect for interior damage, replace tire if damage found
  • Determine if wheel is bent by inspecting for runout, replace wheel if damage is found

Bubble/Bulge

Sidewall

tire-condition


Probable Cause

  • Tire sidewall pinched between road and wheel
  • Components contaminated during manufacturing

Appropriate Correction

  • Dismount tire and inspect, tire manufacturer’s warranty applies if no interior damage is found
  • Dismount tire and inspect, interior damage indicates road hazard

Ozone/Weather Cracking

Sidewall

tire-condition


Probable Cause

  • Frequent exposure to direct sun and hot temperatures
  • Tires exposed to ozone or harsh chemicals

Appropriate Correction

  • Evaluate service conditions and attempt to minimize exposure to sun and heat
  • Attempt to keep tires away from sources of ozone and chemical exposure

Abrasion of Both Sidewalls

Sidewall

tire-condition


Probable Cause

  • Driven on when extremely low on air
  • Driven on when flat

Appropriate Correction

  • Dismount and inspect tire for interior damage, replace tire if damage is found

Tire Inspection Procedures – It is necessary to examine an entire tire to identify the probable cause for any condition. For example, it is possibe that a sidewall bubble may have resulted from a road hazard or improper repair that could only be confirmed by inspecting the interior of the tire.

Highight the Tire Identification Code (DOT Serial Number) and all suspicious areas with a tire marker as you inspect the tire. Begin by inspecting all of the way around the cinrcumference of the tread area looking for punctures, cuts, foreign ibjects and any distortion. Then examine the outboard and inboard sidewalls looking for scuffing, cracks, bulges, breaks, cuts or weather cracking. Finally move to the interior of the tire looking for any innerliner penetrations, cracks, blisters or wrinkling.