Recently I became the proud owner of a Moulton:-
Like all my other bikes, I like to 'personalise' it somewhat.
In this case the most obvious change is from the 17", pneumatic tire wheels to 20" (406mm) wheels with tires from www.airfreetires.com
Where I have become, temporarily, stuck is finding a Sun CR-18 28 hole rim but I hope to find one soon.
Scanning through several threads on these forums I haven't noticed any other Moulton owners but, if there are any lurking, have you made any interesting changes to your machine?