These are the cranks i'm using:
The chainring is hard to remove and hard to find a smaller cog to fit them. (Why i'm after new cranks)
When I got my T-Bird it had 18:24 gearing, so I stayed with that.
I'm going to buy the echo crankas and 12t cog, then when I get enough I'll buy the profile wheel and 18t cog.
No more help needed really..