A quick comparison of a NR with a second-generation Super Record: the distance between the derailleur mount and cage pivot is about the same at 75mm more or less; the distance from the cage pivot to the tension roller pivot on the NR is about 35mm while the SR dimension is approximately 45mm; the distance from the cage pivot to the jockey roller is about the same on both at 25mm, and the relationship between these three pivots is a right triangle with the cage pivot at the apex. (All measures are approximate: the SR is on a bike hanging from the wall and I don't feel like lugging it down right now.) Clearly, the SR can wrap more chain. In my very limited experience, the SR does work noticeably better on wider-range freewheels, but it doesn't have much more capacity than the NR. Neither would be my first choice for a touring or MTB set-up, though on road bikes with 42/52 chain rings and 14-28 freewheels they both do fine.