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Jim,
If your friend decides to purchase and install GY Marathons,
the equivalent size is ST225R/75-15. In 6 ply rating, that tire is rated
to carry 2540 pounds.
Personally, although A/S installs them and many are loyal to
them, I think the GY is overrated. GY claims that the ST has special
rubber compound to resist deterioration from the sun etc. etc. but the first set
on my '93 developed sidewall cracking at about four years of age although they
had been frequently treated to Armorall protectant and had experienced a
reasonable mix of use and idle time.
I bought a replacement set of GY Marathons from SAM's for the
'93 trailer but won't do it again. I put a set of GY LT 700x15 Workhorse
in 8 PR on my vintage trailer. The Workhorse tires are old-fashioned bias
ply truck tires and fit nicely within the fender wells of the '66 Safari.
When purchased from SAM's Club, they come with a lifetime failure and road
hazard warranty.
Oliver Fillipi, who writes on the list, advised recently that
Michelin still makes the XCA 700Rx15 truck radial tire. I am using a new
set of Michelin radials on my puller and find their performance and wear is
impressive. They ride much smoother at speed. Oliver says
it is because they are molded perfectly round, not approximately round as most
lesser tires are. I'll probably buy Michelins when I buy
again.
As with every other purchase, it is a personal
choice.
Harvey
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