At present i have 2 Dunlop M+S on the back both with decent tread on them, however on the front I have some Kuhmo tyres which arn't marked what they are. I would like to fit at some point AT all round but for the time being is there any reason why I couldn't have a mix of M+S on the front and AT on the rear, i'll then fit AT to front when they need changing.