Hi Andrew,
I have a single Etek, 48 volts (pc1200 hawkers), 400 amp Alltrax controller. I am running a chain drive direct.. At 50 mph i have a 100 amp draw (way to much!!) the ratio is 14f and 43 rear. I just thru the sprockets on that i had and now i have to get them closer to the 40 amps that i want at 50 mph. The best part is that the etek a common shaft for industrial stuff, and the honda rear i can get a whole bunch of sprockets
I chose the chain instead of a shaft bike due to loss. Chain drives are still the most efficient way to transfere power. I dont have the experience putting motors together so i cant help you there. good luck, GAME ON!
Paul.
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