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    Low/mid-power 20" folding bike build with 52v battery

    I have a Bafang middirve + 52v battery mountain bike build that I'm enjoying tremendously. Now, for my next project, I want to build a 20"-wheel folding rear-hub-motor e-bike for inner-city commuting. For my base bike I will probably use a Dahon Speed D7. My question is what kind of hub motor...
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    Mounting a li-ion frame battery upside down

    Some old full-sus bikes, like the 2002 speciazlied stumpjumper pictured below in the attachment, have bottle-cage mounting points on the underside of the down tube (in addition to mountin points inside the triangle). Such full-sus bikes have too small a triangle to fit a frame mounted "dolphin"...
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    10 basic questions about batteries and matching to motors

    I have a motor/controller combo that's rated 48V 750W 25A (it's the BBS02). Q1: Why don't these numbers match up? 48V * 25A = 1,200W =/= 750W. What is the physical meaning of each of these numbers? Does the number relate to the motor, controller, or both and how? I have a battery pack that is...
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    First e-bike for city commute, need you help, many decisions

    Hi ES. First timer here looking to electrify my bike. I recently moved to LA and refuse to commute by car. Living previously in Boston, I transported myself everywhere on a conventional bike. But distances are much greater here so I want to electrify my bike to transform it into a commuting...
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