Lo Pros, Represent

also thinking, as its a conversion i could drop the rear cog from 47:17t, to 15t or 14t and take a link out the chain, should be in the same spot without needing a half link.

You need to change the tooth count by 4 to equate to a whole link pair taken out of the chain, e.g. to 47/13. I'd want a gear like that to do between 24:30 and 25:00, that's for an average cadence in the high 80s.