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Was unable to use for Zwift. I was unable to calibrate it by getting it up to 23mph for a "spin down" due to it's drag. Max inflation appears to 65psi and it's pretty soft and balloon like when inflated. A waste of money for me.
This isn't a problem with the vendor, it's a manufacturing problem on Continental's side.
I've never seen such a variation before; this is after purchasing four of the same model now. The first two were from another vendor. The main problem was being out-of-round and varying side-to-side. (I could not return them because I had exceed the vendor's allotted period.). They had transitions of as much as a 1/4" drop over a three inch length. On a mountain bike with front suspension, it still ended up being pretty annoying on rollers (Note: I had the spokes aligned on the wheels, before I installed the tires; rotating them sans tires, they have no eccentricity/wobble.). Another aspect is they can be hard to remove without a tire iron. But with practice you can get them on without too much effort.
The plus side is that they are very quiet, but I've only have about four hours on them. The main point of buying the tires was avoid annoying my neighbors and feeding the neurosis of the dogs in the neighborhood ("What's that strange sound?? Why, I'll just bark until it goes away"). At this point, once the Conti's are worn, I'll try another manufacturer.
I'm keeping the two from this vendor because the out-of-roundness is still there but a much smoother transition (6" to 8") which is tolerable.