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jonny
Obviously the research is being done at the racier end of the spectrum, but notable benefits that are transferable to promuting are the reduced footspeed (for the same cadence) and greater efficiency (less oxygen burned for the same power).
https://www.cervelo.com/en/engineering-field-notes/a-new-spin-on-crank-length
http://www.bhpc.org.uk/short-and-sweet-a-discussion-on-crank-length-by-mike-burrows.aspx
http://www.cobbcycling.com/crank-length-coming-full-circle/