When you go around a corner, the rear tires are rolling on two different arcs. The RR on one arc, and the LR on a smaller arc. The idea of stagger is to have both tires rolling rather than having one sliding. Both tires are going to be turning the same number of rpm's, so the LR tire has to be smaller to be rolling on the smaller arc. This spreadsheet will do that for you, calculate what your stagger has to be depending on the radius of the turn and the distance between the 2 Rear Tires C-C. As you can see from the illustration, both tires are turning the same number of revolutions but their circumference is different (stagger) so both tires are rolling. The second illustration is the formulas in each cell of the spreadsheet.