The 'S' Sinestro and 'D' Destro, Italian left & right respectively refers to the axle thread and in the case of the Pantera to the side the axle goes on. As the axle nuts sit on the inner side of the hub, this is opposite to convention for knock off wheels, but is designed sop that the nut is constantly in tightening motion with the rotation of the axle.
Julian
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