---- Mike S <mikes@flatsurface.com> wrote:
> 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.

The OEM tires on my '91 VW Vanagon GL Campmobile were steel belted radials.  I don't know what brand they were, but they were radials, as described in the owner's manual.  Older radials were all directional, according to manufacturers, but now they are symmetrical.
>

--
David McNeely