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Front hub motor FTW. If that's not cost effective (~$300 for a kit on eBay), then a freewheeling motor in line w/ the axle chain and a couple batteries in the basket on the back. Don't forget you need at least 45* tooth engagement for a good bite on the chain.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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