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https://www.merlincycles.com/icetoolz-12-tooth-external-bottom-bracket-tool-121875.html
I'm looking at this. Maybe for the Prime too.
scultura
External BBs don't have the spindle requirements like BBs of old.
Look for BSA SRAM DUB BB (incidentally, thats what the Prime hub posted above I am trying to figure out the BB tool required) they will be 68/73, with associated spacers.
The cranks will have the spindle attached already, and you want a narrow wide chain ring to keep the thing aligned.
Watch out for boost spaced rear wheels, they need an offset chain ring for the wider rear.