Unbalanced tires?

[BrianG]

I've had this happen too and it seems to be from installing the foams. Even though they feel even, they really aren't. IMO, it's a PITA to get them even somewhat balanced (maybe I'm just too impatient). Another reason why I want real air-filled tires, or at least foams that are pre-formed like the ones you can get for buggies...

[zeropointbug]

Yeah, cuz you should have seen the tires ballooning. Just imagine 3 feet of snow, then a driving start on the road onto the ditches (deep deep snow), then pulling full throttle (geared for ~45mph), and the tires grow to twice the size... it basically glides across the snow, it's quite a sight.

So, maybe it's because the tire balloons into a thin disk and bundles up the foam and perhaps wears the foam down?