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If you are going without a transmission i.e. straight on the diff then you want pretty much as high a ratio as possible, most EVers drive in second gear around town and third on the highway so you'd probably need a diff with a ratio similar to a normal diff + 3rd gear. I know forth is usually 1:1 but I haven't heard of anyone using 4th gear and getting any benefit from it. I'm using a single gear on my motorbike and I'm looking at 5 or 6:1, just based on the max rpm of the motor and my max top speed.
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