The 530 does weigh less and will drag less. To do things "correct" you should change the sprockets at the same time as the chain anyway. If you have to change sprockets you might as well do the conversion. Get a good quality chain and sprocket set, they are built more precise and will last longer. Do you really want to trust your life to a cheap chain made in China? No offense to you cafeken because I have bought the cheap chain off of ebay too when money was short. The thing I noticed was the initial chain stretch is terrible and soon the links start to bind. It will get you by till you can get a better quality chain. I like RK brand chain, and if you have the room I really like sealed o-ring or x-ring chains. They are more expensive but last longer. Just my thoughts.