Probably to some people this might be a stupid question.

I'm changing my sprocket to 15/47, I'm looking for the chain that will fit that
set up. Will it be 520, 525 or 530?

Thanks in Advance

P.S. I apologize for the dumb question

 

depending on what series sprockets you put on the bike,i changed my f3 to 520 and installed 15/48,and had to buy a 141 tooth chain off ebay.i cut off about 5 links on that.

 

So, will I be able to use my stock chain?
Right now I have a RK X ring chain.

 

if you use the same series sprockets,it might work.i think stock is around 130 links,that may be a tad short.