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    Conversion to electric motorcycle

    Dear ladies and fellows:
    I have been working for a couple of months to see if I can figure out a way to convert adownhill bicycle into an electric cargo bike that the California DMV will license as an electric motorcycle that can go on the freeway. My vendor says he can hook me up with a Crystalyte Crown Motor with a 24 mosfet Infineon controller that will do 70 plus mph with a 150 volts. I can't find a battery that size but maybe I can hook up batteries in series that will equal that. The guy at Power velocity told me he thinks that it is foolish to use a heavy Hub motor going that kind of speed because if you go through a pothole the inertia will really throw you . So there are so so many things to consider to build such a bike technically.
    I think the technical stuff might be easier than the legal stuff. The fellow from Power velocity also said that he's tried to get such a vehicle licensed and the DMV is very uncooperative. They say the bike has to have a motor and a clutch and their comment also is that the legality of riding on the freeway is between you and the policeman because it's really a gray area. I have to admit I had one highway patrolman on the phone one day and he was really scaring me.
    I guess I must be a glutton for punishment. But one reason I'm a vegetarian is to lower my carbon footprint so this project is also part of that same alignment. I might end up giving up. Anyone have any thoughts or encouragement otherwise?
    thanks so much
    bicyclemichaela

    #2
    I don't think this is a safe idea. Riding electric bicycles on the highway, even fast electric bikes, is probably not wise.

    If you really truly want to build an electric motorcycle to go 70mph you need to custom build the entire thing including the frame. Not a single component on the build should be a bicycle component. I have seen a custom build using old bmw motorcycle frame stuffed with repurposed leaf batteries inside the chassis, and other even more custom builds. It would take a whole lot of work.

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      #3
      Start with a cheap used already licensed motor cycle. Gets the carbon sputtering gas engine off the road; which reduces your carbon foot print far more than converting a bicycle.

      Power and Energy: Rough conservative guide: figure 25Wh per mile at 20 mph; 1/6 of the drag at 20 mph is friction (power proportional to speed) and 5/6 is aerodynamic (power proportional to speed cubed). Use a spreadsheet to figure out Wh per mile at various speeds from there. Then calculate battery size required.

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        #4
        Found the link I was referring to:

        https://drivetribe.com/p/r888-mk001-...Q8a8J-zUclvheg

        Click image for larger version  Name:	NJhFj4thQM2UJNEGTlFHFQ.jpg Views:	1 Size:	184.7 KB ID:	73655

        We have a new site up by the way that centers around electric motorcycles including conversions. Might want to give it a read if you're looking to do something similar.

        http://electricmotorcycle.com/

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          #5
          Originally posted by paxtana View Post
          I don't think this is a safe idea. Riding electric bicycles on the highway, even fast electric bikes, is probably not wise.

          If you really truly want to build an electric motorcycle to go 70mph you need to custom build the entire thing including the frame. Not a single component on the build should be a bicycle component. I have seen a custom build using old bmw motorcycle frame stuffed with repurposed leaf batteries inside the chassis, and other even more custom builds. It would take a whole lot of work.
          Do they even speed rate bicycle tires? 70 mph continuous would be a glorious blowout. +1 on at least using motorcycle wheels and suspension on whatever you choose.

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            #6
            On a bike? Really bad idea. Convert a motorcycle? Go for it.

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              #7
              Where I live (SF Bay Area), pedaling an ebike on the freeway would definitely get you pulled over by LE.

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