^ Thats what I was getting at just a lil bit more straight forward.
on a side note.. A 525 chain is only 1.7mm wider then a 520.. but a 530 chain is nearly 3mm wider then a 520.. You "should" be able to use a 525 chain with 520 sprockets... they would just ride a tad lower on the sprocket.. I wouldn't trust a 530 chain on 520 sprockets.. thats just too wide. Typically a 525 chain will be about 1500#'s more tensile str. Just my take on that. But as Tyler mention.. I dont see a need for a 530 chain. There has to me some other issue. I've only broke one chain and I was 100% at fault.