According to my vauxhall dealer, my steering rack gas gone. The car is a 1.8 SXI and is only 3 months old. They are blaiming it on my 18" wheels and the extra sress they cause. However, vauxhall sell 8*18" wheels as an accessory that have an offset of 38, therefore theretically causing more problems and requireing an even wider tyre then my 215 because of the extra width. The knocking was already there before the whels were on but i only thought it was a problem when i compaired to another astra. The car has only done 3700 miles. Any opinions?