spartan said:
They do not have a three ply sidewall like the BFG, but I have cut and punctured several three ply BFG sidewalls over the years. I think the three ply thing is more gimmick than function or every off road tire would have it.
They were the best in their time, but have been surpassed.
My other hobby is high power rocketry, we use a lot of composite materials, the technology has advanced greatly in the last 10 years. When we order composite cloth, glass, Aramid, carbon, hybrid, whatever, we specify the thread count, weight, weave and a bunch of other details that determine the strength of the lay-up. By selecting the proper cloth and resins a thinner, lighter structure can be much stronger than a thick many layer one or even steel.
Tires are a composite structure, cloth and rubber, the same rules apply. 2 ply, 3 ply what cloth? If you look at big truck tire add copy some are advertised as
10 ply rated -
6 ply, why, newer cloths are stronger, that 6 ply tire may be stronger, more flexible, lighter and cheaper to make, buyers are looking for a 10 ply tire so the add guys put the 10 ply rated on them. Take 3 ply of nylon pantyhose and 1 of ballistic nylon and stick a pencil though them, I think the 1 ply of ballistic nylon will be stronger. The ply issue is only good add copy without data, probably sells a lot of tires!
I think it's goodyear that's loudly trumpeting their "new" Kevlar tires. Do they have a good belt of ballistic Kevlar that would do some good, is it Kevlar tissue, or Kevlar dust in the mix so they can advertise that they have Kevlar in them? As for the "new" thing, Aramid belted tires have been around for a long time, if you pay too much for Aramid from DuPont you get to call it Kevlar, Kevlar is just DuPont's registered trade name for Aramid.
Some testing would be cool, take sidewalls and tread sections from tires, stretch them in a frame, place that in a press and push a half inch rod or whatever into them, to see how much pressure it takes to permanently deform them and how much to poke a hole. Without data all we have is the testimony of other wheelers and advertising BS!
