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  1. #1
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    Advice on ebike conversion

    An 83 y/o friend of mine rides a scorpion trike with the 3speed hub and 10 gear cassette. Doesnt want to lose the gearing by replacing the rear wheel with a hub motor but needs some electric assist up the hills. Doesnt like the ride kick trailor. He needs a system that will drive the chain not the wheel in order to use all those gears. Any suggestions?

  2. #2
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    Try Ebikes.ca and their Stokemonkey mid-drive setup.


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  3. #3
    Senior Member rscamp's Avatar
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    Also look into a Bafang 8fun BBS02 crank drive...
    Rob

  4. #4
    Senior Member chas58's Avatar
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    Quote Originally Posted by rscamp View Post
    Also look into a Bafang 8fun BBS02 crank drive...
    +1. That is what he wants.

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    +2

  6. #6
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    Why do you guys prefer mid driver over rear or front hub motors?

  7. #7
    Senior Member rscamp's Avatar
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    Quote Originally Posted by vincent713 View Post
    Why do you guys prefer mid driver over rear or front hub motors?
    Crank drive has some nice advantages:

    - location of mass better for handling
    - gearing ratio is changeable to exchange speed for torque and vice versa
    - both wheels remain easier to remove for repair
    Rob

  8. #8
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    Quote Originally Posted by rscamp View Post
    Crank drive has some nice advantages:

    - location of mass better for handling
    - gearing ratio is changeable to exchange speed for torque and vice versa
    - both wheels remain easier to remove for repair
    Rob, you make a good point on the advantages of a mid motor. Do you mind sharing the disadvantages?

  9. #9
    Senior Member rscamp's Avatar
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    Quote Originally Posted by vincent713 View Post
    Rob, you make a good point on the advantages of a mid motor. Do you mind sharing the disadvantages?
    Sure. In the interest of fairness...

    - generally more expensive
    - more mechanical complexity
    - harder on pedal chain
    - totally dependent on the pedal chain (a series rather than a parallel drive)
    - not as simple to install and use
    Rob

  10. #10
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    Quote Originally Posted by rscamp View Post
    Sure. In the interest of fairness...

    - generally more expensive
    - more mechanical complexity
    - harder on pedal chain
    - totally dependent on the pedal chain (a series rather than a parallel drive)
    - not as simple to install and use
    With that being said, which type of motor do you prefer? I personally like the rear geared hub motors. I find it has good torque, light weight and looks more stealthy.

  11. #11
    Senior Member rscamp's Avatar
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    Quote Originally Posted by vincent713 View Post
    With that being said, which type of motor do you prefer? I personally like the rear geared hub motors. I find it has good torque, light weight and looks more stealthy.
    I like both and don't have a preference until the usage is defined. For example, a crank drive with a variable speed rear hub is a combo that is nice to use. With a derailleur, shifting - at least shifting in a way that doesn't shorten component life - gets more fussy and results in annoying short periods of no assist. The nature and abilities of the user are also huge when it comes to selecting the best option.

    I do recommend something like the eZee geared hub from Grin when people ask. Unfortunately, even geared hubs are heavy and don't work well with suspension. I do a fair bit of riding with no power assist so what I really don't like are direct drive hubs of legal power level - they are too heavy, they are relatively poor hill climbers and they have too much drag when not in use. But that's for me and my usage profile...
    Rob

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