· Eh Muh Gawd Becky!!
530 chain and sprockets are made with more material then a 520 so the 520 will save rotational weight. kinda like lighter rims. they generally put 530 chains on anything with more then 100hp because it was felt that all that torque and HP would break anything less robust but the technology on todays 520 chains is far superior to what it used to be. some will still argue that 530 is the only chain for big HP but whatever. chain brands are few and all seem to have the X-ring technology now so all are good. sprockets.....there are several manufacturers of sprockets but Vortex, Sunstar, and AFAM spring to mind as being good.