Originally Posted by BMW_Belgier
THIS IS SAFETY RELEVANT!
I strongly recommend you, not mounting 2 different kind (brand, model) of tires! This is not safe!
In my country it is even forbidden and, when caught, they will forbid you to drive your car!
That's what I was getting at. When I used to sell tires, we learned what happens when you do this. The way they react in the rain can be pretty dangerous.