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  1. C

    Overvolting bbs02 troubleshoot

    Since this is now more of a troubleshooting thread, rather than mechanical, I am moving the last question of my other ebike mechanical thread, about overvolting bbs02(or more like overamping it with a new controller), here to the troubleshoot section. What I am trying to do is to hook up my...
  2. C

    Grinding noise in hub motor

    In one of my builds I have this weird grinding noise. The same as in this video. It only arises at the start when I throttle hard or go up a steep hill. Any idea what the issue is when this particular grinding noise arises?
  3. C

    M5 Display - setting magnets and PAS sensitivity

    So I have an M5 display, a 17mah controller(compatible with 36v and 48v) and a 36 volt battery on my ebike. It was originally a 48 volt battery on it but I switched it out. Everything is working fine now. But I want the PAS to help me for a longer period. When it kicks in. It is now kicking in...
  4. C

    Putting 36volt battery on a 48v controller?

    So I bought a used 36volt battery that works on my bracket. Before I had a 48v battery. Now, can I use this despite the controller being 48v15a? Seems to spin the wheel when I put the battery in. But maybe I would end up hurting the battery right? Controller looks like picture. Battery is...
  5. C

    Battery does not charge above 10% all of a sudden

    So I have been using this 48volt 18ah battery for quite some time now. But it has not shown any signs of diminishing amp hours or anything like that. Not anything that I have noticed. But today the bike just stopped all of a sudden. And the battery was showing like 5 max 10% charge. I had to...
  6. C

    Putting the gear sensor on BBS02 higher up towards the tube.

    So as you can see from my pictures the gear sensor gets kind of stretched when I put it all the way back on my fatbike, towards the sprocket/cassette. So could I just as well put it on the gear cable but a lot higher up? I am thinking under the upper bike tube, as I am proposing on the second...
  7. C

    Correct stem height

    This is not only EV per see. But I am putting on a new steering stem/handlebar bar on my bike and I wonder what a correct height should be for a fatbike I am going to run on on trail for the most part? And also what would be a good width for the steering stem? 70-76 cm? How can I stand over the...
  8. C

    BBS02 not running on PAS

    https://www.veed.io/view/0b960c85-711e-4cbb-ba21-b28f68926e0d?panel=share So I have this bbs02 I am building. Thing is the gas throttle makes the chain go forward. But the pedal assist does not even make the chain move. Looks like this above when I am turning the pedals. Thing is the chain...
  9. C

    Bafang crank/pedal-arm not turning the drive chain

    So I have installed a moification kit from golden motors to fit my bafang mid drive kit. And to make the axle longer and fit my fatbike. Now, seems the throttle is working as it should. But because of some reason the pedal arm is not moving the drivechain forward. Kit is this one...
  10. C

    Correect height for a new rear derailleur(linkglide)

    So I am building a new bike with some linkglide and bafang parts. I am now in the process of putting on the chain and a new rear derailleur. The bike is built almost from scratch so I have no old rear derailleur height to compare with. What would you say is the correct height for it to be...
  11. C

    Could a cell explode?

    When shorting a cell during a battery build for example.. When the cell is at 3,7 volts before the build. Or when you do something wrong in general that could lead to shorts an so on. Could the cell actually explode? Sending shrapnel into your face and potentially hurt your eyes? Or is that...
  12. C

    Putting the chain line right important for a bafang diy?

    So as a few people have seen I am currently on a crusade to understand what I need to do to finish a bafang bike. Several of them actually. Since I got a hold of a few ruined motors. Now, I have changed nylon gears, pas sensors and all kinds of hassle. I also have used a modification kit to...
  13. C

    Overvolting BBS02

    So I have been thinking about potentially overvolting the bbs02 with a new controller. Any idea how much it can take? I was thinking like maybe using like a max current controller of 45a. But maybe this is way too much for it to handle? It might only be able to take like max current of 30 or...
  14. C

    Possible to hook up a bafang mid drive motor with a new controller from CSC?

    So I have a BBS02. I am thinking about changing the controller to a more powerful 35amp controller that will be hooked to the bike externally, and fastened outside(externally) of the motor. To one of the tubes or something like other controllers are fastened. Anyone has done this and know if it...
  15. C

    What are flexible batteries?

    So I found this drill battery. https://www.aliexpress.com/item/1005005816538414.html?pdp_npi=3%40dis%21USD%21US%20%2490.00%21US%20%2428.80%21%21%21%21%21%402103253416986579750572401e3b87%2112000034451546577%21im%21%21 Says on the pack 60 volts but at the left also 20. Is this a flexible...
  16. C

    Bafang display shuts itself off

    So on my other bike I have a bbs02. Everything works fine. Only thing is the display shuts itself off sometimes when cycling. Seems to be nothing wrong with it except for this. I just have to turn it on again and then I am able to ride it again. Any idea why this happens? And if I can do...
  17. C

    When you had a cell go bad. What was the main mistake you did?

    I wonder what mistakes are to be avoided that other people have already made when making their lithium battery packs? What happened to you when you had an accident or a cell that went burning or something like that? And how do you avoid that mistake when building your battery packs nowadays? I...
  18. C

    52 volt higher range?

    So a 52 volt battery of 18ah will have a higher range than a 48volt battery of the same amp hours, namely 18ah? Why is this? I have read that this is the case. But if they are both put to their highest speed limit should they not loose their current around as fast? Or will the 52 volt battery...
  19. C

    Build two wheel drive without cycle analyst

    So I watched Micah Tolls video here where he talks about making a two wheel drive but keeping only one battery. I would like to try this. But I wonder if there is any cheaper alternative to that cycle analyst used in his video? And also what happens if I do this using only throttle. Will it go...
  20. C

    Trying to put back wheel on bike - makes strange sound

    Hi So I am trying to put a backmotor-wheel on a bike-frame that I have. 28 wheels. I have a sw900 display available and the controller I have has the metrics as in the screenshot here. The battery is a 36 volt battery from an old bike I had. I am now trying to see if they are all going to work...
  21. C

    Sw900 p14 realted to controller

    So on one of the bikes I have my controller is as the picture 35+- which is a good powerful controller. Battery is 48 motor is 1000w. Now, on the sw900-display on the bike there is a p14 setting, in the parameters, that is "the current-limiting of controller". This is now set to 20. But as I...
  22. C

    27,5 rear wheel on 29 bike frame?

    So I am going to put a 27,5 wheel on a 29 bike frame. Because the only rear motor wheel I have at home now is a 27,5 wheel. This should be okay, right? Will it look weird you guys think? Perhaps I should also change to 27,5 at the front? Or could I just as well just keep the 28-29 wheel there...
  23. C

    Bafang 750watt motor making strange sound (and not working)

    So today after a slope I was at a traffic light. Then I tried to get my Bafang motor-driven bike on the highest gear without pedaling going over when it turned green. So then it started making these strange sounds. And perhaps now it is defunct. Any idea if this can be salvaged by opening the...
  24. C

    Fatbike with mid drive good drivetrain kit?

    So I am going to try to get an acceptable drivetrain kit that works for a new fatbike with mid drive motor I am building. Not too cheap, not too expensive. Just affordable but can work for some time. I am thinking of a kit with 10-speed. Not sure what you guys think. Would it work? Is ten speed...
  25. C

    Controller and volts

    So I am trying to understand basics of controllers, amps and batteries. So for example if I have a controller of max current 45A.. And a battery of let us say 48 volt and 20ah. And then I switch battery, but keep the same controller, to a 72volt battery 20AH. Will this have an effect on the...
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