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  1. J

    Wheel diameter to speed/RPM chart

    Good stuff. Anyone make a similar but for IGHs?
  2. J

    Li-ion Battery Voltage vs State of Charge

    wesnewell, thanks.
  3. J

    Li-ion Battery Voltage vs State of Charge

    Thank you. Yes, my first-order approximation is going to be useless at the ends. So, how to modify it so it's somewhat more useful?
  4. J

    Li-ion Battery Voltage vs State of Charge

    Am I doing this right? I have a 14S pack of 18650 li-ion cells. 52V nominal voltage. If a fully-charged cell is 4.20V, and if I "judgement-call" a cell at 3.00V to be fully-discharged, I get 1.20V from fully-discharged to fully-charged. In a 14S pack, that's 16.8 volts from discharged to...
  5. J

    Computer geeks, I need help

    Mark5 -- thanks.
  6. J

    Computer geeks, I need help

    Thank you. Windows Device Manager says that there is no driver for that device. Where do I find the driver? The article I linked says nothing about that.
  7. J

    Computer geeks, I need help

    Hi, I'm trying to program the controller for my Bafang BBS02 using the instructions found at https://electricbike-blog.com/2015/03/17/programming-the-bbs02-without-frying-your-controller-and-losing-your-sanity/. I'm using the Lunacycle BBSXX-PROG-CBL Bafang BBS02 and BBSHD Programming Cable...
  8. J

    Help solve a chain drop problem

    Thanks amberwolf. Because I shortsightedly ground off the derailer hanger from this frame I'll have to use a bolt-on derailer hanger to use any chain tensioner, DIY or store-bought. The more stuff I stack on the drive-side of the wheel axle, the more chance that the hub could get yanked...
  9. J

    Help solve a chain drop problem

    Very cool, m4k3r! But I don't think the tube will take up slack in my chain, I don't have a derailer and your bike does, so you have the chain wrap in the derailer to take up chain slack. That tube thing looks good to control the chain from flopping around but it's not a tensioner. I took the...
  10. J

    Help solve a chain drop problem

    How long before the chain chews :lol: through a ziptie and you hear the sound of a chunk of PVC pipe get sucked into your derailer? :lol:
  11. J

    Help solve a chain drop problem

    This chainstay-mount chain tensioner might be my hero. http://www.jensonusa.com/DMN-Chain-Tensioner-Chainstay-Mount
  12. J

    Help solve a chain drop problem

    Thanks, all. @Tommie and Woodlandhills: A chain tensioner is probably in my future. As is me continually asking myself why I cut off the derailer hanger from the frame before painting it. This, I think, is going to be one of those things that I will end up regretting. I can use an add-on...
  13. J

    Help solve a chain drop problem

    Hm. What I'm dealing with here is the "Horizontal dropout, short" as shown at http://www.sheldonbrown.com/fixed-conversion.html, about halfway down. But I cut off the derailer hanger, perhaps foolishly, thinking I would not need it. With an angle grinder I was able to elongate the dropout so...
  14. J

    Help solve a chain drop problem

    This is my first electric bike build. I am using a '90s Nishiki mountain bike frame with short horizontal dropouts, a Bafang BBS02 mid drive motor with a Lekkie Bling Ring, and a Shimano Nexus 3-speed hub on the rear, with stock 19T sprocket, flipped over so that the driveline is good. Under...
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