@bear
real / strong advantage ?
i guess not really.
ok you make some 1-2 hp at very
max. rpm caused by the bit less friction the smaller chain has on sprockets but what for on street?
ok and you reduce the entire weigth because the 520 is a little bit less heavy than the 530 - i guess 2 or 3 pounds. (btw - what´s the weight of the entire busa??????)
disadvantage by less milage you can ride with the 520 compared to 530.
the pulling force of a 520 is smaller than at a 530 - arround i guess 1.000 lbs - look for the mechanical numbers for both.
and it can be difficult to get the ratio YOU want for YOUR busa
in 530 size all thinkable ratios are more or less possible and! available!
in 520 size not (as far as i know at the moment)