Hi I was wondering if the 2 extra wires on the sw900 was a speed sensor and found this thread and a another saying it was lights.
I connected the red and black to a 52v battery and the brown and white where putting out around 45v and when I turned the lights switch on it dropped to 11.75v...
I found this
http://www.ebay.co.uk/itm/DNP-Epoch-Freewheel-7-Speed-11-28T-with-Removal-Tool-for-14mm-Axles-/152670199327?hash=item238bda5e1f:g:L6QAAOSwTA9X3TDK
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