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  1. Astra J/GTC
    Guys, I was kindly asked to start a new thread as I asked two questions on the last post....;) Would there be any problems aside from a slight difference in the speedo reading if I fitted 245/35/20 tyres instead of 245/40/20 which are on the car at the moment? It's an Astra Gtc Bi-Turbo. :confused:
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