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  1. J

    E-bike Powered by Tool Batteries?

    I was wondering if anyone has made an e-bike powered with batteries from any of the battery powered tools (e.g. Greenworks, Ego, Ryobi, etc). Seems like an interesting way to save on cost (if you already have the batteries) and make the power system modular (e.g. put in one battery pack for a...
  2. J

    Cycle Analyst v3 and TDCM Torque Sensor Question

    Is it possible to set the throttle/current in the CA3 as a function of both torque and cadence from the TDCM torque sensor? Here is what I think I would like to do: Current = MAX ( Torque * A , Cadence * B ) This way the torque sensing gets you off to a nice, quick start. But once you have...
  3. J

    TDCM Installation Help

    I just finished installing the TDCM torque sensor in my Trek 4500. The instructions specify a certain orientation of the bottom bracket spindle with respect to the crank arm (see image). However, the square taper on my crank is oriented 45° differently than shown in the instructions (see other...
  4. J

    EM3ev Contact Info

    Can someone PM me an e-mail address for EM3ev.com? I keep getting a "Forbidden: Permission denied" error when I try to use their online contact form. Thanks, Jeff
  5. J

    Bafang CST Motor - No load test

    I just received a Bafang CST motor from BMS Battery. I bought the 500W, 270 RPM motor: https://bmsbattery.com/ebike-kit/589-bafang-36v-cst-rear-driving-e-bike-motor-wheel-ebike-kit.html On the motor, it says: CST 36V500W 26 1506 7052-6 Is there any way to confirm that this is the 270 RPM...
  6. J

    Questions about Q128C Motors

    https://bmsbattery.com/ebike-kit/768-q128c-135mm-500w-rear-driving-ebike-hub-motor-ebike-kit.html 1. Is a 328 RPM @ 36V different from a 328 RPM @ 48V? Are they wound differently? 2. Which one (including the 201 RPM windings) would be the closest to the 500W Bafang CST @ 270 RPM? And how does...
  7. J

    First Build Info - Trek 800, Bafang SWXH

    Here's info on my first bike build in case people are interested or it helps others: Background - This is my first bike build. The motivation was to build a bike for my brother. He can only pedal with one leg due to an injury. This makes going up hills very difficult. So the goal was to...
  8. J

    Trek 800 Dropout Width

    Do people ever have too modify dropout widths to install hub motors? I'm looking at putting a Bafang SWXH on a Trek 800. The drawing for motor says the flat-flat dimension is 10 mm +0.0/-0.1. I'm measuring the width of the dropouts to be roughly 9.5 mm with calipers. I wiped both sides to...
  9. J

    Will This Combo Work?

    I'm looking for a simple set up. Will this motor and battery/controller combination work okay together? Does this controller limit the current in a throttle only application? Thanks in advance! I see that there are some redundant components between the two kits. I'm okay with that. 36V10AH...
  10. J

    Help Selecting a Kit/Components for First Build

    First time poster, 3 weeks of lurking. I’m looking for some guidance on a bike I’m converting for my brother. He can only pedal with one leg due to an injury. But he enjoys riding his bike and it’s a good form of exercise. However, he is limited to mostly flat roads/paths because he has...
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