October 15, 2009

Formato dos pneus


O formato dos pneus também é uma forma de garantir maior estabilidade e segurança ao automóvel, pois existem diferentes formatos para diferentes tipos de veículos, e para diferentes situações na estrada tal como as condições climatéricas ou velocidade.

Existem dois tipos de desenhos de pneus, os simétricos e o assimétrico. Os pneus com desenho simétrico podem ser bi-direccionais ou direccionais, no pneu bi-direccional a primeira instalação pode ser feita em qualquer posição, pois as ranhuras vão sempre ficar na mesma geometria, já nos pneus simétricos direccionais existe uma indicação nas laterais indicando o sentido de rotação do mesmo. No pneu assimétrico deve haver na lateral do mesmo uma indicação sobre a correcta posição de instalação, pois estes não podem ser colocados de qualquer maneira pois apenas podem rodar num sentido.

Depois de lido isto é importante dizer que se deve evitar mudar o sentido de rotação de um pneu ao longo da sua vida, porque a sua estrutura foi sempre solicitada em um determinado vector de força, se depois se trocar esse vector então o pneu passa a sofrer uma força contrária, o que vai fazer com que o material se desgaste e desagregue muito mais facilmente. Devido a este cuidado, os pneus assimétricos que possuem a indicação de lateral externa não podem sofrer o rodízio cruzado (em x), devendo-se apenas circular os pneus entre o eixo dianteiro e o traseiro do mesmo lado. O mesmo vale para os pneus simétricos direccionais e bi-direccionais.

Veja a vida útil do pneu

formato pneus mota

formato pneus mota

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