Originally Posted by kbauman92
For the past few days ive spent hours on TW and Tirerack reading reviews, and looking up prices on some 285/75/16 tires but every 285 i see in that size is a E rated tire and from what ive read there very heavy and ride rough, any suggestions or input from guys running "E" rated tires.
Anything would be helpful, thanks in advance.
E-rated tires really dont ride any more rough than any other tires. Where this misconception comes from is that the change in tire load rating usually coincides with a change in tire size or type, possibly overinflation, possibly failure to compensate for the lower inflation requirements of a larger tire.
One of the BIGGEST problems that lead to the misconception that large tires ride extra rough, is from those people who inflate their tires to the number specified on the side wall. A "P"-type tire will usually say something like 40 psi. A "C" rated tire, about 50 psi. An "E" rated tire, about 80 psi. Obviously, if you're (inappropriately) inflating to the sidewall rating, going from 40 to 80 psi is going to have a HUGE effect on the ride quality.
As a hypothetical example, if you change from the stock "P" tires and go up to "E" tires of the exact same size, the inflation spec in the owner's manual (probably about 30 psi) remains valid and the ride should be fairly similar.
Now if you're going with a larger tire, lets say its 25% wider, but the same height, you will note that there is 25% more tire touching the road, so it will actually support a greater load at the same pressure. In other words, it will ride more harsh. In this instance, you would want to select a lower inflation to compensate.
Now there is one critical element that has to be considered when selecting a lower than factory inflation: lateral support. Larger tires do not provide an increase in lateral support. The only thing that maintains your level of lateral support is the inflation pressure. If you run at lower pressure, you reduce lateral support, which increases the tendency for the tire to get pulled under when you're coming around a corner, possibly even collapse or pop the tire off the rim.
Summary: the effect of load rating on ride quality is minimal, as long as you follow the vehicle's specifications regarding inflation and don't go to far oversized. If you do go too far oversized, then your ride quality may decrease, but due to the size, not so much the load rating.