DRW Stability
Been reading the SRW vs DRW threads... I have never towed with a DRW and I'm curious what everyone means by "stability". Can you describe what you're experiencing that feels more stable. To say ...
Forum Discussion
RoyJ wrote:transamz9 wrote:RoyJ wrote:transamz9 wrote:
All 4 sidewalls on my dually flex just as much as the sidewalls on my SRW from side to side.
Each tire is still the same, but now that the force is spread out to 4 sets of tire sidewalls, the forces are halved compared to the SRW.
It's like putting springs in parallel - you effectively double your spring rate.
I will have to respectively disagree. The side wall does nothing for holding the tread from moving side to side. It's the air pressure in the tire pushing out away from the center of the wheel that keeps the tire from moving side to side.
It's actually a combination of both. All side walls have a natural stiffness, some (like a low profile runflat) are much stiffer than others (say a P-rated 225/80 tire). An E rated tire is stiffer than a C rated, because of thicker sidewalls. Think to the extreme case - put a bucket loader tire on a pickup, and it'll be perfectly stiff running 0 psi!
For EACH case, adding air pressure would increase its lateral stiffness further. A runflat at 35psi is stiff than when it's flat, an E rated LT tire at 80psi is stiffer than a C at 55 psi, all things being equal.
But that wasn't my point. Regardless if we agree where a tire gets its lateral stiffness from, 4 tires on an axle would always be stiffer than 2 tires on an axle.
An E rated tire at 50 psi is no stiffer than a p rated tire of the same size at 50 psi. The sides walls on all these tires are 4 ply. The differences are in the tread plys. If you put 80 psi in a passenger tire it will have no more movement side to side as an LT tire at 80 psi.
