At 05:25 PM 6/25/2010, Dave Mcneely wrote...
>Another question --  The owner's manual says to rotate the tires front
>to back and back to front, with no crossover.  That's like we used to
>do with directional radials, but most are not directional now.

Directional radials (like those with a "V" shaped tread, as popularized
with the Goodyear Gatorbacks) must be rotated back to front. Same with
older bias plys. It may be that the recommendation is based on the
required higher load range commercial (or reinforced) tires often being
bias ply at the time it was written.