at ~26 lbs. I put on SSR Comps (17x8.5), so I saveed about 12lbs at each corner...My S4 was chipped/exhaust/suspension...anyway...I did not feel any difference in acceleration...although, I did feel a noticeable difference in cornering...I can't really explain it....could just be placebo effect...but cornering felt better with the lighter/wider wheels....