Domingo, Novembro 12, 2006

A substituição de somente dois pneus no automóvel

Preocupado com a substituição de somente dois pneus em seu automóvel e onde colocá-los, na frente ou na traseira. Diante de várias opiniões obtidas sobre o tema, meu irmão Rubem resolveu consultar a Pirelli. Vejam a resposta dada pelo Sr. Júlio Buchalla - Pirelli Pneus S.A. - Serviço de Atendimento ao Cliente - SAC - 0800 728 76 38 - Identificação: 43.142.
"Agradecemos seu e-mail e informamos que por ocasião da troca de pneus num veículo de passeio, o ideal é sempre substituir os quatro pneus usados por outros novos, o que ensejará o melhor desempenho global do veículo.
Neste momento, caso o pneu de estepe esteja em perfeitas condições, deve ser colocado para rodar, porque os pneus envelhecem com o tempo, mesmo se não estiverem sendo usados ou se seu uso é apenas esporádico.
Em função dos motivos vários (falta de rodízio periódico, diferenças no consumo de pneus entre eixo dianteiro e traseiro ou entre lados, maneiras de dirigir, etc.).
É normal ocorrer a necessidade de substituição de apenas dois pneus com menor resíduo de desenho, sendo prática comum de mercado, montar os pneus novos nas posições dianteiras.
Neste particular esclarecemos que os dois pneus novos (ou com maior resíduo de desenho) devem de preferência ser montados nas posições traseiras, independente do veículo ser dotado de tração dianteira ou tração traseira.
A instalação dos pneus novos na traseira trará como resultados:
1 - Melhor dirigibilidade e maior segurança em veículo sobreesterçantes que são aqueles com maior tendência de deriva nas posições traseiras, portanto mais difíceis de serem controlados;
2 - Otimização dos freios porque quando freiamos, a carga sobre o eixo dianteiro pode vir a ser o dobro daquela no eixo traseiro, o que justifica a necessidade de termos pneus com maior aderência no eixo menos carregado, para melhor distribuir a ação dos freios;
3 - Melhor desempenho em pavimentos de baixa aderência;
4 - Uma perfuração ou avaria num pneu dianteiro é rapidamente constatada e o controle do veículo é facilitado pela direção. Por esta razão os pneus novos ou os melhores pneus devem ser montados nas posições traseiras onde a percepção de qualquer problema dessa ordem é mais demorada e onde o controle do veículo também é mais difícil; e
5 - Nas situações críticas, como por exemplo em dias de chuva, uma eventual aquaplanagem em curva é muito mais perigosa nos pneus traseiros do que nos dianteiros.
Por todas estas razões é que os pneus devem ser retirados de uso e substituídos, assim que forem atingidos os indicadores de desgaste no fundo do desenho (saliências com 1,6 mm de altura). Nos casos de necessidade de substituição de apenas dois pneus em veículos de passeio, recomendamos a montagem dos pneus novos sempre nas posições traseiras.
À disposição".

 
 

1 Comments:

  • Sempre estamos aprendendo alguma coisa nova,agradeço a duvida do amigo e a resposta e justificativas
    do fabricante!
    Parabens!
    Paulo gusmão

    By Anonymous Anônimo, at 28/12/06 00:12  

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