I needed to clean the chain on my 520. I tried the Bike shop Chain Gang thing without much luck. I couldn't get it to hook onto the chain the right way, or so I'm guessing. The chain kept getting jammed. next I tried the cleaning solution included with the chain gang, but without the fancy chainwasher thingie attached. Not much luck with that either. Finally, I gave up on the bike shop cleaner and got out the trusty old brake cleaner purchased at Pep Boys. 5 minutes later I had a clean chain. The gunk just fell off. The chain hasn't been this clean since it was new. For anyone needing to clean their chain, skip the purpose made bike shop cleaners and save yourself some money. Brake cleaner is cheaper and works better.