I bought a used bike, and it needs a new chain (I hadda take a link out of it to be able to adjust it). The sprockets look good though, no bent teeth, no "sharpened" teeth... thing is, the original size chain for the bike is a 532... and I have no idea (or way of knowing) whether the chain on there is 532 or 530. First question is, is there an easy way to tell a 532 chain from a 530 and the more important question is: do the same sprockets work for 530 and 532 chain. I don't want to have to replace the sprockets, but I *really* don't want to guess the wrong size on the chain and then have to buy ANOTHER chain along with sprockets from ruining the works with mismatched stuff. The bike had 30,000 miles on it when I got it, so I *know* that it's not the original sprockets and chain on there, but the guy I bought it from isn't the one who replaced the stuff, so there's no way of finding out what size chain was used. Help? Please?