I bought 520 conv. and changed my sprockets size and bought it from the same people. Good price but took about 1-2 weeks to get. The 520 conv means the chain and sprocket are going to be thiner.
But get a DID or RK chain and a O ring is good but a X ring is better.
Your bike or 1000cc bikes come stock with a 530 set up and 600cc bike come with 520 set up. But you can put a 520 on any bike.
I put the 520 on mine and I have not had any problems. It been 2500 miles.