a 530 chain is 5/8 of an inch per link, or .625 inches per link. Your sprocket size is nominal, so no extra length needed to wrap. If your stretch is definitive at 6 inches from the countershaft to the axle line then the 130 should get you there, as that's 26 more links than the standard chain, 13 for each side of the run. That's 8 inches per side of extra chain, so you will be chunking a few. BTW, when buying chain for your hard tail, make sure to get 2 or 3 extra master links. You may find you need to drop a link or two after the chain stretches, and you don't want to be looking around for a compatible link for days.