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Zero S 11.4 Owner - barging into an ended thread. - Sorry.
Zero Sells alternative drive sprockets - for more torque and less range, so going the other way would help. They also sell chain drives for the FX (off road) so you needn't worry about rocks.
I can't vouch for aftermarket voiding warrantee but the speedometer is user programmable to modify the ratios so the speedo stays reasonably accurate.
Torque is torque - be it off the line or after 30 mph - so the smaller belt is not being preserved by less power off the line. The smaller belt is because no abuse from clutch dumping. The less power off the line is for control (or so I'm told).
They have bluetooth programmable "economy" settings which allows reducing overall torque, top speed and regeneration. Setting the torque down to 10% and it lumbers off the line like a moped. I programmed mine for less regenerative braking for use in the rain.
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