IV - THE MAIN PROBLEMS The 7 main defects

Cracks

Splits / Crown

crown sidewall

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 underinflated.

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.

DESCRIPTION Crown damage with or without puncture and/or tears and splits. Localised 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 underinflated, 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.

crown sidewall

DESCRIPTION Localized or widespread cracks in the rubber - radial, oblique or on the circumference - of varying sizes that may reach the plies. These breaks may be on all sidewall areas of the tyre.

CAUSES Visible damage in the flexed area.

CHECKS/ADVICE Types of surface of use: Roads, paths, accesses Speed load, pressure Inspect the other tyres on the vehicle Adapt pressure to use Replace the product(s) concerned if the splits are deep or have reached the plies or carcass.

DESCRIPTION Splits in the rubber on the crown, edge or base of tread, with or without radial or circumference tears.

CAUSES Conditions of use.

DEVELOPMENT Risk of contamination with damage to crown or sidewall.

CHECKS / ADVICE Check conditions of use: Replace the product(s) concerned if the damage is extensive and has reached plies or the carcass.

Technical data

MICHELIN 2wheel - 180