I was talking to my engineer recently and we spoke about many things involving one of my projects but he did say that it is in the best interests to keep the track legal as in no more than 26mm (I think, don't quote me look it up) wider than original. But if the track does exist outside this and it can't be remedied you would need to explain why it needs to be wider and prove that it is still safe and the suspension geometry is not significantly changed.
In my case I am aiming to try and keep it bang on stock but the fronts are going to wider with the Metro hubs I believe but we'll see.
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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T
