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Rotor cranks that would fit are the 3DF, 3D30, 3D+, Flow. I guess their new 4-arm cranks too.
Unless you have a badly undersized BB shell width then those cranks would go on without any spacers and then just an adjustment of the preload ring. But In some cases you may need their 0.5mm plastic spacer on the non-drive-side to fill up some space.
Haha this is a nightmare! So do you know if I can use any cranks with the Rotor cups I have? Thank you.