Originally Posted by Wavshrdr
Don't forget to add the effects of the chain not being in a straight line.
Supposedly, the efficiency loss from cross-line offset and poor lubrication are negligible ... at least in a lab.
http://www.ihpva.org/HParchive/PDF/hp50-2000.pdf
Regarding the Nexus-8 internal hub weight, I find 1550 grams too.