I think there is something significantly different between the definitions of turn-radius vs turn-around diameter, but I am not sure what it is. NH claims that the real difference in performance is turn-around diameter. In their brouchure, they compare themselves to JD & Kubota, and JD has the largest swath of uncut grass during a u-turn. From their pictures, turn radius looks to be the radius of the circle that is made by the center of the front axle, while turn-around diameter looks to be the diameter measured from the center of the rear axle.
The biggest advantage & what in fact drive up the cost of SS is the Sensitrak system that lets you stay in 4wd while making tight turns. The clutch will release during a turn, thus sparing your lawn from damage.
The biggest advantage & what in fact drive up the cost of SS is the Sensitrak system that lets you stay in 4wd while making tight turns. The clutch will release during a turn, thus sparing your lawn from damage.