Light Truck 215/85R16
The recommended rim width is wider than our original wheels/rims, but mounting that side radial on a 4.5" rim will make the tire taller (lowers RPM) and narrower (makes the tires look more "natural" for the old truck).
Some people argue that mounting on a narrower rim puts strains on the sidewalls. That might be true for Le Mans racing, but no one has posted experiencing side-wall failure.
One pair on my trucks are 12 years old - well beyond the "warranty" period.
Agreed. That size is a pit wide for the stock rims, but it is the closest you'll find. On the sidewall support issue, in my experience, it's more of a handling issue than a tire failure problem. At higher speeds (50+), the sidewalls lack proper support on a too narrow wheel, and this can lead to severe wander. However, for the typical use these trucks see, and the speeds generally run, it shouldn't be a problem.
