205 50 r17 runflat were standard on my bmw. Passed on them 88 thousand (summer 60%, winter 40%). There were strong blows, when I thought, well, that's it, the end of them, but they all endured, except for the last time, apparently the wear had an effect, but the blow tore the rear, and the front hernia. they didn’t lower it, I drove to the house, they lowered it there. There were punctures from self-tapping screws, but since the runflat did not take a steam bath and always drove to the tire shopSee full review