Have not compared to 10” rims. Car handles well at speed. One extra leaf each side, Bilsteins. There is some sidewall flex. When pushed real hard in curves or at Willow Springs, the left rear tire inside wall did kiss the leaf spring. Put a spacer on and it was cured. No downside noticed in real world driving. I like to push it in the Canyons on the way to L.A. to try to keep up with my pal in a fast and light A Body.