I've got to go with Mattax on this. Weight transfer causes body roll, but body roll dosen't cause weight transfer. The main factors influencing lateral weight transfer are center of gravity height and track [ how far apart the wheels are from left to right ]. A lower the center of gravity and a wider track will reduce weight transfer. Since body roll dosen't affect weight transfer, why do we care about it? The reason is as I mentioned earlier, to prevent an undesirable camber change which reduces traction. Speed also affects weight transfer. Going slower will reduce it, but that's sort of self-defeating. Amxautox has given an excellent demonstration of both good grip, driving skill and how a rear bar on a rear drive car can make putting the power down early difficult. It's actually pretty common to see front drivers lift the inside rear in hard cornering.