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@TheBrick(Tommy)
On the rear b.b with a same side drive the front chain pulls forward and the rear chain pulls backward, but on the same side, evening out the torque placed on the b.b in the horizontal plane.
On a cross over the pull in eacj direction is on opposite sides of the b.b hence puts more of a torque in the horizontal plane ( think looking from above) and hence more force onto the b.b bearings. I'm not very good at explaining it but if you draw yourself a little diagram it makes more sense.