Apparently we have different definitions of solid rear axle?? In your post it says "features a differential rear-end with internal solid axles" A differential rearend is not a solid rear axle. There are 2 axles connected by the differential, thus allowing each wheel to turn independantly from each other (like a car). a solid rear axle has no differential, like a the old ATV's.
Never put your motorcycle where your brain hasn't already been.