Also don't forget about voltage sag as the batteries discharge. My bike is 72v nominal. Coming off the charger is around 78 volts and if I discharge all the way down to 10 volts per battery that is 60V (worst case). That is a pretty wide top speed spread to keep in mind. Here is the 4qd website I was thinking of. http://www.4qd.co.uk/faq/roadspd.html The Etek spec is 72 rpm per volt I think.
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