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IV - LES PRINCIPAUX PROBLÈMES Troubles du comportement

La répartition des charges a une influence significative sur l apparition ou non de trouble du véhicule.

La présence d accessoires rapportés ou modifiés : Top-case, sacoches, carénage, para-brise, poignées, siège, roues non d origine, embouts de guidon non d origine

L état général de la moto :

Uniformité des roues à rayon, roues endommagées. Usure des roulements Fourche : alignement, joints, huile Colonne de direction Bras oscillant Amortisseur Cadre endommagé, points de fixation moteur

Mais le pneu n est pas toujours la cause...

Quand le pneu contribue a un trouble de comportement

Louvoiement Guidonnage Shimmy Vibration

NIVEAU D USURE Effet important Effet sensible Effet sensible Faible effet PRESSION DE GONFLAGE Effet important Effet sensible Effet sensible Aucun effet STRUCTURE : BIAS / RADIAL Effet important Effet sensible Effet sensible Aucun effet CENTRAGE : PNEU / ROUE Effet important Effet sensible Effet sensible Effet important ÉQUILIBRAGE : PNEU / ROUE Faible effet Aucun effet Aucun effet Effet important

Il n est pas toujours facile de déterminer les causes et origines des différents troubles de comportement. Les problèmes de comportement peuvent provenir des pneumatiques (type de pneu, pression inadaptée) et/ou d une évolution du véhicule (accessoire, chargement...). Le pneu n est donc pas toujours le seul à mettre en cause.

LES PRINCIPAUX TROUBLES DE COMPORTEMENT

LE Louvoiement LE Guidonnage LE SHIMMY LES vibrations

Mouvement ondulatoire, d amplitude variable, intervenant en ligne droite ou en courbe et débutant à une vitesse moyenne de l ordre de 140 km/h.

Mouvement latéral brutal de l avant (aller et retour de la fourche), ponctuel et très rapide, intervenant surtout en phase d accélération et déclenché par une excitation extérieure (bosse, raccord).

Oscillation latérale et entretenue de la fourche à faible vitesse (<100 km/h) en phase de décélération.

Elles apparaissent au niveau de l ensemble fourche / roue avant à des vitesses de l ordre de 90 à 130 km/h.

MICHELIN 2 ROUES - 176

Données techniques

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