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@lae
Surly Dingle on one side, ENO double freewheel on the other. Four gears!
The ENO doubles are like £70 though.
Also I don't know if the tooth gaps are enough on the ENO double. Dingles go 17/21 which is enough for about a 20" difference, so enough for hilly areas. The ENOs only have a difference of two teeth which is about 10" difference.
With a double chainset and single cog/freewheel you can get a massive difference for a hill gear though - e.g. 34/40 chainset and 22/16 flip-flop gives 67" fixed and 41" free.