IV - THE MAIN PROBLEMS

The 7 main defects

Graining (competition range)

Marble

Tyre damage / Wear

CHECKS / ADVICE

1.Increase the pressure (1.8 bar maximum for the rear ;

2.5 for the front)

2.Choose a softer compound and adapt pressure to type

of use

3.Adjust the bike settings to make the rear tyre work

correctly

DESCRIPTION

Formation of deep wrinkles, visible on the internal or

external shoulder of the tyre.

CAUSES

The mixture is not warmed up, the tyre is outside its

window of use.

The mixture temperature is too low; grip is therefore not

generated.

Inner liner

CAUSES

Puncture, pressure loss, under pressure riding,

excessive load evolutions.

DEVELOPMENT

Run-f lat riding, tyre dislocation.

CHECKS / ADVICE

Damage can not be seen from the outside of the tyre,

in the case of puncture, the tyre must be demounted to

be checked internally. A tyre with marbling evident is no

longer f it for continued use and should be scrapped.

THE TYRE MUST NOT SHOW ANY SIGNS OF MARBLING

BEFORE REPAIR.

DESCRIPTION

The marble is a pleating of the inner liner. In the marbled

areas, the rubber is blackened on a width which can have

dif ferent sizes.

Type of wear

crown

DESCRIPTION

Uneven wear

Type of wear on crown sawtooth wear

in the rolling direction maxmin wear

evidence of wear on the shoulder railtype

wear

DEVELOPMENT

If wear is too pronounced risk of damage to

the crown plies

CHECKS ADVICE

Go over the history of the tyre mileage dates changed load frontrear

f itment etc

Check conditions of use

Check if the size is suitable and the one recommended by the manufacturer

Check inf lation pressure

Check the mechanical condition of suspension steering and wheel bearing

elements

Correct all mechanical anomalies on the vehicle

Do not exceed the recommended load

MICHELIN MOTORCYCLE AND SCOOTER 182

Technical data