You've got 12.5" wide tires on factory rims? That's gotta be pushin the
limit for width already, for a taller tire you're looking at pizza cutters.
Try something like a 35x10.5r15 Super Swamper SSR.
Obviously not factory wheels at 15", so we should assume he means he wants
to go back to the factory wheels (16") and put bigger tires on these
(discontinuing use of either the aftermarket or 80s body style 15" wheels).
I think I've heard a 315 width, but not sure of the ratios. Compare this
width 315mm to 12.5" and you'll find they're basically same width.
'87 was the last year for 15" wheels on 4x4's. When they changed the
body style, they went to 16" as well as a diffeent rim offset.
Now... the Blazer, Suburban and crew cab pickup didn't change to the
new body style until '92. So you will find factory 15" rims on them
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