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Old guy from Ohio

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    Old guy from Ohio

    Hi. I'm a 71 year old retiree who wants to convert my daughter's bike to electric. The bike is a nice 21 speed with a heavy-duty aluminum frame. It has 700 type wheels. I have good mechanical and electric skills. I plan on short rides no longer than three-four miles. No big hills, only minor changes in grade. I am a big guy, 260 pounds, so I am going to build a little on the heavy duty side. I have a 44 tooth rear sprocket that I can attach to the left side of the rear wheel. That way I'll still have all 21 speeds available to pedal. I want to mount a 36 volt motor above the rear wheel and drop the chain down vertically to the 44 toother. I plan on using three 12 volt, 18 amp/hour batteries wired in series. Do I need a gear-reduced motor (480 RPM) or just a 2600 RPM without gear reduction?
    I plan on ordering everything (motor, batteries, controller, etc...) from Motor Scooter Parts in California. Andrew there has been very helpful, but I am still not sure what type of motor to get. Thanks for any help or guidance.

    ~Lee (Bullseye)
    Last edited by bullseye; 03-16-2019, 04:54 AM.

    #2
    Perhaps you have your reasons for building something that way, but if it were me I would be putting on a standard hub motor - either front or rear. There's a lot less that can go wrong with a hub motor setup. Also when you say 3 x 12 volt batteries, are you talking about SLA batteries? While they may be a little cheaper to buy, they will not last nearly as long as lithium and will weigh an awful lot. I would definitely go with lithium no matter what else you do with the motor.

    Also in your proposed design, you would have all the weight - batteries, motor, etc over the rear wheel. It will be quite unbalanced for riding.

    Just my humble opinion.

    Comment


      #3
      Originally posted by Fred View Post
      Perhaps you have your reasons for building something that way, but if it were me I would be putting on a standard hub motor - either front or rear. There's a lot less that can go wrong with a hub motor setup. Also when you say 3 x 12 volt batteries, are you talking about SLA batteries? While they may be a little cheaper to buy, they will not last nearly as long as lithium and will weigh an awful lot. I would definitely go with lithium no matter what else you do with the motor.

      Also in your proposed design, you would have all the weight - batteries, motor, etc over the rear wheel. It will be quite unbalanced for riding.

      Just my humble opinion.
      Thanks for your input and reply. I am going to mount the batteries low, only the motor will over the wheel height. Yes $LA - I am retired and Social Security doesn't give a rat's sprocket about my hobbies. ;-) My budget, daily, fairly short rides, my climate and my health are on which I based my decision(s). I've carried milk and groceries in a handle bar mounted basket and survived - well, at least I'm still here.
      Fred, I really want to know about the motor RPM. Thanks again for your thoughtful reply, Lee

      Comment


        #4
        Originally posted by Fred View Post
        Perhaps you have your reasons for building something that way, but if it were me I would be putting on a standard hub motor - either front or rear. There's a lot less that can go wrong with a hub motor setup. Also when you say 3 x 12 volt batteries, are you talking about SLA batteries? While they may be a little cheaper to buy, they will not last nearly as long as lithium and will weigh an awful lot. I would definitely go with lithium no matter what else you do with the motor.

        Also in your proposed design, you would have all the weight - batteries, motor, etc over the rear wheel. It will be quite unbalanced for riding.

        Just my humble opinion.
        Fred, I have reread your reply and rethought my project. I ordered a Bafang 48 volt front hub kit and a Greenergia Ebike Battery 48V 12AH lithium ion battery. My daughter bought the battery for me as a gift. I am grateful for your advice and guidance. Battery should arrive this coming Monday and the hub kit in two to five weeks - via Slow Boat from China Express. I've been pedaling around the area further and further each day preparing/training for the e-bike. Thanks again for getting me on the right track.
        ~Lee

        Comment


          #5
          Hi guys and gals! I'm a newbie here, a fan of electro bikes from Washington D.C.
          Need a guide on how to write essays? Find it on http://paperwritingservicesreviews.c...-write-essays/

          Comment


            #6
            Originally posted by Fred View Post
            Perhaps you have your reasons for building something that way, but if it were me I would be putting on a standard hub motor - either front or rear. There's a lot less that can go wrong with a hub motor setup. Also when you say 3 x 12 volt batteries, are you talking about SLA batteries? While they may be a little cheaper to buy, they will not last nearly as long as lithium and will weigh an awful lot. I would definitely go with lithium no matter what else you do with the motor.

            Also in your proposed design, you would have all the weight - batteries, motor, etc over the rear wheel. It will be quite unbalanced for riding.

            Just my humble opinion.
            Fred!

            THANK YOU for your sage advice. I am so happy with my Bafang front wheel drive kit and battery. It looks and runs great. The battery arrived promptly but the motor/wheel kit took months. Amazon really helped in getting Greenergia to deliver. The box was in shambles but everything was there - loose but okay. I had fun putting it together and it goes like a stripped-azz ape. I ride it everyday weather permits, mostly for fun, but I have used it for errands. Everyone who sees it is fascinated with its range and power.

            ~Lee

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