[Hardrvin]

^ Cusco tarmac diff would be another option. But as I recall they're a bit difficult to get your hands on and $$$.

 

[Hardrvin]

Though he does point a point...

But I'll counter that 1: it is convenient to have same size tires front and back for rotation and for the Suby AWD needing same overall diameters to avoid speed differences.

and 2: Width has different affects in different conditions. A wide tires is no fun in powder snow, but great on dry tarmac.