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"Zero motorcycles are capable of 0-60 in 4 seconds partly due to the huge pizza sized rear sprocket I assume."
This statement makes a lot of assumptions. How do you know what the front sprocket size is? Vehicle top speed? Zero bikes are fast due to their battery and motor drive output. Gearing is how that power is translated. They would be faster 0-60mph if they were geared for 70mph instead of 80 or 100mph.
You have it backwards. If you gear it for a higher top speed, your efficiency is going to drop, and you will be stressing the motor more during getting up to speed.
If you are looking for best efficiency at top speed, then taller gearing may help a few %. But that is not real world usage. (90-100mph?) Terry Hershner changed to a slighter higher gear ratio, but that is because his goal is range at 70-80mph, AND he has a much lower load on his motor with the full streamlining.
Bottom line is that you want to gear your bike for the highest speed you will want to go, and NO HIGHER. Any gearing higher than what you will use is pure waste and loss in performance.
Electric motors do not work like ICE, where low rpm save fuel. Most electric motors are most efficiency around 80% of their top speed. So plan for that in your gear ratio.
On my converted motorcycle, I have it gearing limited to 66mph so if I ever need to use the freeway, I can. I actually rarely go over 50mph and avoid fast roads, so I would get better range and less motor heat if I geared it for 55mph. I spend a lot of time at 30-40mph.
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