I never cross rotate my tires. I had problems not all that long ago with the tires on my truck after the tire shop did that. One tire started to separate and could not be balanced a week later.

I don't see how you could cross rotate directional tires unless you dismount and remount them.

 

I think the Monster was referring to non-directional tires, which still make up a large part of the tire market both OE and replacement. In years past, steel belted tires were somewhat sensitive to being run first in one direction for several thousand miles and then made to run in the other. Bias ply and fiberglass-belted tires never seemed to have the same issue.


Unidirectional is with reference to the tread pattern. Wet road performance is improved over a nondirectional tire when it is run in the direction indicated. And poorer if you run them the wrong way. It's all about water evacuation - tossing water off the contact patch laterally being better than squeezing it toward the tread center and hydroplaning/floating the tire sooner.

Asymmetric tires have a specific non-symmetric carcass construction that means that one of the sidewalls is specifically intended to go on the outside (these are the ones that will have some means of identifying which side goes 'out' - be sure to mention this to your tire guy if you buy your tires online).

Tires can be unidirectional, asymmetric only, or unidirectional AND asymmetric.

Tires are hugely further developed than anything you could even find in the 1960's.


I'm not afraid to cross-rotate the BFG KDWS tires that came as OE on my '08 GT, but my new set of GY Eagle F1 Asymmetrics are same-side front to rear only.


Norm