Nagrom doesn't ride bikes he hangs out on the interwebs all day, if I were you I'd true tension the wheels tighten the crank bolts grease your seatpost headset and hubs, and the cog and locking when you replace them. I have Had a decent experience with my surly cog and lock ring, though they may be a little expensive for what they are. Keep in mind your stock chainring and chain are 3/32 so if you replace the cog or add a freewheel and the replacement is 1/8th inch you will have to buy an 1/8" chain, you can keep the chainring you have and I won't really make a difference.