IV - THE MAIN PROBLEMS

The 7 main defects

Damage

Impact

crown sidewall

DESCRIPTION

Crown damage with or without puncture and/or tears and

splits. Localized breaking.

CAUSES

External aggression either by running over sharp/blunt

objects or by rubbing against a foreign body.

DEVELOPMENT

Damage to a tyre by running underinf lated, breakage

of plies, product delamination.

CHECKS / ADVICE

•Check conditions of use.

•Check pressure used.

•Replace the product(s) concerned if the damage

is extensive and has reached plies or the carcass.

DESCRIPTION

Damage to sidewalls with or without puncture instead

of perforation and/or tears.

CAUSES

External aggression either by running over sharp/blunt

objects or by rubbing against a foreign body.

DEVELOPMENT

Rubber and/or plies broken on the sidewall, running

underinf lated.

CHECKS / ADVICE

•Check the conditions of use.

•Check pressure used.

•Replace the product(s) concerned if the damage

is extensive and has reached plies or the carcass.

crown sidewall

DESCRIPTION

Impact with plies broken on the crown

Evidence of impact are generally found on the tread

CAUSES

External aggression by running over sharpblunt objects

DEVELOPMENT

Rubber andor plies broken on the sidewall running

underinf lated

CHECKS ADVICE

Check conditions of use

Replace the tyre

Examine the other tyres on the vehicle

DESCRIPTION

Cuts extended to the carcass visible plies with or without

broken cords Pinching impact

Immediate break without pinching

CAUSES

Impact or pinching of the sidewalls after running over

a pothole or mounting a kerb for example

DEVELOPMENT

Rubber andor plies broken on the sidewall running

underinf lated

CHECKS ADVICE

Check conditions of use

Replace the products concerned if the carcasses

are damaged

Useful tip

When making visual checks pay particular attention to the tread area and the sidewalls. Look for unusual, excessive, or uneven

tread wear, foreign objects, bulges or deformation, signs of penetration, cracking of the rubber or any deterioration or damage.

MICHELIN MOTORCYCLE AND SCOOTER 180

Technical data