Originally Posted by Nezek

You can mix if you have the same two tyres on front and same two on back, although keeping the same tyres all round is better for the traction, smoothness of drive, road noise control and general performance.

I have all four michelin pilot 2 sports on my xfire, the traction is awesome, the road noise is super-minimal and i get a really smooth ride! the only downfall is they cost £250 each :/