I see you've got a 1965 Aztec, I don't know what the gross weight is, but
our '66 can't use the 6 plys because they are only rated at 1900 lbs each,
or 3800 lbs total, the 8 plys are rated at 2250 each, 4500 lbs total. As
far as all retractable gear aircraft not being able to use retreads,
that's
a myth as most retractable gear airplanes actually do use retreads ie. the
airlines. There is an FAA AC that advises when installing retreads on
retractable gear planes to do a gear swing and make sure they fit in the
wells and to be carefull that the sidewalls do not overswell do to heat
build up on take off runs. There is no mention of retread tires in our
POH
or in the manual for the Cessna R182 we flew.

We still haven't found any retreads and have ordered new tires which will
provide us with good cases for future retreading.



It's in the service manual that I have for the airplane, but then again,
that service manual was written 30 some years ago, so maybe retreads weren't
as good back then as they are now so there were more problems with the tires
getting stuck in the wheel wells, etc. The Goodyear tires that I ordered are
rated at 2550 Lbs for the 8 ply. I noticed that the Goodyear speed rating is
higher than those made by others, then again, I doubt I'll ever land the
Aztec at 160 MPH which is what they're rated for. If I land that fast, the
tires would be the least of my worries

--
Louis L. Perley III
N46000 - C152
N370 - PA-23-250