I'm looking at either the Yokohama Avid TRZ or H4S for a 2005 Civic (195 60 15). I understand the H4S is a directional tire so no cross rotating. What confuses me about the TRZ is that the tread pattern has an outer and inner block... OK so far, but also appears to have a 'directional' pattern so that grooves (or swipes) on one side of the car will curve forward while the other side will curve back. ( I hope I'm explaining this clearly) Anyway, this would seem to have an effect on the tires behaviour depending on which side it is mounted... Can someone explain this? Or should I just get the H4S to avoid further consternation...? Thanks.