As long as he keeps the tire diameter the same, at around 26", and the tire/wheel weighs about the same, the above statement regarding "larger moment of inertia" does not apply. And based on all the coversation here, it sounds like he's considering a tire around 225/50R17 and is looking at some nice aluminum wheels. I bet the 17" wheel/tire package is no heavier than whatever came stock on this car. Is a 7.25" rear end the best thing in the world? Nope, but we don't even know what engine this car has, or its intended use. So it may be just fine.