205 profile are the correct size to fit 7" rims which was fine with the MK1 but with the MK2 the rims were 7.5" wide so the correct size is actualy 215/40/17. MG were just tight arsed bast's and fitted 205's no doubt to save a couple of quid ! 225's will be too wide which in my opinion is worse than too narrow as the side walls get very stressed.
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