The 2/single speed 1 or 2 cog hub is already a weight choice, so I suppose the derailleur 3rd cog follows on that line..

suppose next they have to create a way to use the rightLever, for the IGH detents indexing the pulley pusher.

since the either or left shifter doesn't need a 3rd positon..


I think the 349 'kojak' is a 32 .. and the 5 speed hub is in 28 spoke, and same hub shell diameter to use the stock Brompton rim and spoke.

just that vendor aimed at the customer wanting the racier options.