> I have two used tires ( obtained at Mexican tire shop ) on the front of m=
y Explorer.
> 1/4 inch of tread is left. =A0I was driving on a dirt road that had rocks=
 on it from time to time. =A0The rocks were as large as 1 inch.
>
Was the road freshly graded by any chance.  In our part of the world -
Western Australia when ever the dirt roads are freshly graded it seems
to have the effect of leaving many rocks with pointy ends up.  So the
first few passes, vehicles seem to have a higher chance of getting
tire damage.  After a few passes the rocks are all laying flat again
and damage tends to reduce.

Best tires I ever used on a Land Cruiser was light truck tires with
split rims. I never ever had a flat tire with these.  I had to remove
the wide rims as they only supported what they called recreational
tires with no strength in the walls and if I went any where near rocks
I was up for big bucks.

--=20
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