Well another set of 296's bit the dust @22,270 miles. Noted a screw laying under rear of the car this morning, looked too new and shiny to be off Z but was taking a glance under to make sure. So I just happen to spot what appeared to be the early stages of a crack on rear drivers side. Pulled it off and sure enough a crack. Figured I better check rear passenger side as well. Surprise, surprise that side has a single crack as well but more advanced. TPM not triggered & tires were still holding pressure @ 36 psi. The hook is on the way to haul it off to the dealer - not taking any chances exasperating the situation. Just inspected them @ 20K miles about 2 months ago with no issue.
Let the fun begin! Hopefully not much of a battle as I have the BMW Tire & wheel Insurance and caught the problem before they deflated and self destructed.
Pasenger Side
Driver's Side
And away she goes