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Lighter steering effort, not lighter weight. Adding scrub radius increases steering effort and bumpsteer. It matters a lot if you have PS disabled...
It's all degrees. lowering ride height by 1.5" or so has a far more minor effect on geometry than the drastic lowering and extremely negative static camber that usually accompanies the ultra low offset wheels.
There are plenty of improvements to be had with larger, wider wheels without radical offset changes. Grip still improves, tire selection still improves, unsprung weight still goes down, and even with a "mistake" +30 wheel, track width increases almost an inch.
I know what I want out of my car, I know plenty about chassis engineering, and I know I don't want wheels that don't fit in the stock unrolled/unpulled bodywork.
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