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It really depends on how fast you want to go and how step of hills you want to climb as to what motor will work.
A nice size motor is the motor out of reel to reel tape storage from the '70's and '80's but they are getting harder to find, I looked on SurplusCenter.com and didn't see any motors that would work well for a bicycle but they sometimes get stuff like that.
Personally I'd look in the trash for electric bicycles and electric scooters and use one of those motors, people buy them and either never use them and kill the battery or they drain the battery down all the way over and over again and kill the battery then find that the replacement battery from the store they bought it from is nearly as expensive as the bike that they bought so it gets tossed in the corner.
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