Re: wrong chain
the last number is the amount of links and a few to many isn't a major problem as they can just be chopped off, however the first number is to do with pitch/weight, the higher the number the bigger/beefier the chain will be, a number of racers will down grade to a 520 setup to save weight, or for something like a superduke/speedtriple it'll come standard with a 530.
it is possible to fit either a 520 or a 530 to an SV, but you'll need both sprockets and chain matched (as in all have to be the same number), but I wouldn't bother, take it back he's sold you the wrong one, the sv was designed for a 525 and that's what you should be fitting.
Cheers Mark.
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