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  1. #1
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    1938 moped/motorcycle conversion

    Hello,
    I am considering to convert this little beautie into an electric motorbike:
    20190728_170930.jpg
    In those years many bicycle manufacturers built these vehicles, the 98ccm-engine from Fichtel&Sachs was the most popular motor.
    It is 2,25HP rated and has pedals, each has its own chain. So I have the choice to go for an electric motor to simply replace the ICE and keep the rest as it is (wold keep the bike's general appearance), or to search for a hub motor (which I do prefer because of efficiency and noise reduction and having space for the batteries in the frame area).
    One problem is to find a hub motor that fits into the frame, there is only 135mm clearance in the back end.
    I think 2kW is reasonable, maybe 3kW would be better in order to run the motor only occasionally with max. power.
    Another challenge may be to fit the motor into the 26"-rim. Custom-made spokes should be not the issue.
    All options open, comments and suggestions welcome!
    Thank You in advance,
    Markus
    Last edited by schelle63; 10 May 2020 at 0622. Reason: typing error...

  2. #2
    Senior Member Stevo's Avatar
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    I think you should check with American Pickers and see if its worth selling as is, then take the money and build a real electric motorcycle. Oh wait, you are in Germany...
    That bike looks like it may be worth something to an antique collector.
    Since its basically a bicycle, a hub drive would be a good choice, but a something like this may work too https://www.electricbike.com/lightni...mid-drive-kit/
    Last edited by Stevo; 11 May 2020 at 1121.
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
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  4. #4
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    Sadly, there are no hub motors that can pull 2-3 kW continuously with 135 mm drop out spacing. You could definitely do it with motors front and rear.

    https://www.ebikes.ca/tools/simulato...lse&bopen=true

  5. #5
    Senior Member Stevo's Avatar
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    I like the idea of a 2 wheel drive mountain bike. Warren, have you built any 2 wheel drive systems? Is it necessary to synchronize the two wheels?
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
    Current builds: eVOR.v3.4
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  6. #6
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    Stevo,

    I have not built a 2WD yet. If we get out of this pandemic someday, I will most definitely build my dream bike, a 60" WB, 2WD, full suspension recumbent low racer.

    https://www.ebikes.ca/tools/simulato...lse&bopen=true

    No synchronization required. Each motor has its own controller, and both are run from one throttle going through the Cycle Analyst. In theory each motor should deliver exactly the same power. In reality any tiny differences will mean one motor may be pulling a few more watts than the other, I suppose. This also works for multi-track vehicles. And it eliminates the need for a differential, as each motor will automatically turn at the speed needed in a turn. Yeah..electrics are amazing!

    http://www.evalbum.com/3367

    https://endless-sphere.com/forums/vi...hp?f=2&t=33429

    https://endless-sphere.com/forums/vi...hp?f=2&t=12500

    Well, this is timely! Justin the man himself will be doing a video on this very subject.

    https://www.youtube.com/watch?v=Ub4E...o_LBDnXP2PjNnR
    Last edited by Warren; 14 May 2020 at 1551.

  7. #7
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    Hi, thank You for the responses. I already figured out that the 135mm would be an issue.
    The thing with the antique collectors is that the bike may disappear and never see a road again. This is not why it had been built. With a modern drive, and keeping most of its classic appearance, it might run many km again.
    (Hmmm...2-wheel-drive...)

    Markus

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