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This seems to indicate that they come as 15mm as standard but might need a separate set of end caps.
https://www.bike-mailorder.com/con-tec-hub-powerhouse-hub-2-with-6-holes-black
https://www.bike-mailorder.nl/con-tec-asadapter-voor-powerhouse-naafdynamo-15-12
Am not so optimistic about all this now :(
spj7
One thing that came up last week is that the 650B wheel hubs are 15mm not 12mm, some spec or delivery error, not sure. Need to look into it.