Wheels

From the factory, most SK Foresters have a 17x7 wheel with +48mm offset and a 5x114.3 Bolt pattern with a center bore of ---.

I love my Enkei RPF1s. They are the same size as stock, 17x7, but the offset of +45mm means that they sit outboard by 3mm more than stock. That's about a 10th on an inch. I like these wheels because they are very lightweight and strong for the price. 

The parts of your car that are not supported by the suspension contribute to the unsprung mass. 

When you go from 0 to 60, your wheels and tires go too, but they also have to "spin-up." By keeping the mass low, we can minimize the required energy. They say that every pound of wheel/tire "feels" the same a xxx pounds of cargo weight.

Sorry, I'm still working on adding info.