If you have any interest in saving a little unsprung weight, then you can go to a 520. You need sprockets, too. I have a 520 on the DL 1000, use it at drag strips and track days and lots of highway miles and it works fine. There are various grades of chain, too. You can get a 520 that's stronger than most 525s. the sprockets are narrower, so they will wear a hair faster. Everything has a price. If you are going to change sprockets too, then why not save some weight?