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
transamz9 wrote:
The reason the EMT's has a better response is because even though it is the same size tire as the Michelin it actually has less air volume to allow the same flex because of the run flat lining inside the tire.
Take a look at a cut EMT:
The reduction in air volume is negligible. In addition, the same size EMT is physically larger than the Cup (the 325 EMT has same tread width as 345 Michelin), which further negates the slight decrease in air volume.
What is NOT negligible, is the obvious increase in sidewall thickness and construction. Which is the heavy contributor to flex.
Depending on the compound that is used in the granny tires and provided they are the same size and have the same air volume then yes you will get the same response with the same air pressure.
Again, go back to my NASCAR example of why two tires, both high profile, one maintains squareness at 2g lateral, at 30psi, while the other rolls its sidewalls, at .8g lateral, at 47 psi.
To answer your earlier question if I have ever touched a tire. I was a tire tech at our local Corp Goodyear store for 3 years and then went to Big O tires where I was the service manager so yes I'm sure that I have touched a tire or two. But I'm not pissin either.;)
Since you brought your profession into the mix, I will state mine. I am a mechanical engineer, with experiences in fuel cell power-train design, wood composites, and fluids. A lot of the work I do involve pressure vessels, the deflection of materials, and fluid bodies under pressure. So while I've never personally designed a tire, you can bet that I understand material deflection on a pressurized container fairly well!
I respect your experiences with tires, and I am sure you've felt a lot of them. But selling / servicing a product is not the same as designing something. And tire design is strictly an engineering profession.
I don't want to start a geek discussion, which is why I've kept the debate in layman's terms. But let me just say one thing: you cannot analyze the deflection of a pressure vessel (which an inflated tire is), by completely ignoring either the fluid body (air) or vessel body (tire carcass / rim). Unless, one is of much higher strength than the other, rendering the other body negligible.
