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Head e-citybike, 28 inch,. Shimano Nexus 8. Apr 16, 2011 · My hub is the SG-8R31 which I think is the current standard model of the Nexus 8. The SG-8R36 being the premium redband version which is better in some way (possibly rated for off-road use, I'm not sure. The alfine certainly is for off-road use though and also takes a disc brake)..