All things being equal, a 525 chain should theoretically last longer than a 520, but 520 is a more popular size and you will have more gearing choices and probably access to higher quality chains. You can order steel 520 pitch sprockets and I dont think there would be a significant, if any, difference in chain life. I run a 520 on both of my litre bikes with no issues.
The chain tool you referenced is more than up to the job of removing/reinstalling your chain. I like to grind the heads off of the rivets to spare my chain tool some stress.
Bookmarks