I'm going to get a new chain for my bike and it looks like my rear sprocket is probably due... so the drive sprocket is most definitely due. Now I've read that the 750K2 had a 17T sprocket as opposed to the 18T on all the later models. The little bit of extra jump that the 17T drive offers appeals to me, but when I looked for the 17T drive on the microfiches, it said the K2 had an 18T.
Where do I get a 17T sprocket from then? Also, our bikes take 530 series chain, right?