After a quick search, I found this
Quote:
https://m.reddit.com/r/BMW/comments/...lats_but_what/
In my case, it was unsprung weight. The fat sidewalls made the tires about 2x the weight of non-runflats. With a light car on a road with potholes (my daily route at the time) the extra mass was a challenge for the suspension to manage. Traction was so screwed, it felt like the tires were bouncing off the road.
On a smooth autocross course, they were fine. And the stiff sidewalls helped turn in. But the world isn't an autocross.
I've heard runflats have gotten lighter since then (2007), so maybe the problem isn't as bad.
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