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  1. S

    Brake failure resulting in airborne bakfiets

    I think moisture/water/vapor droplets in the air in tube can cause extra large increase in pressure with temperature. Another possible good reason for using nitrogen in tires which is normal I believe in formulae 1 cars (as well as 'Divvy' bikes etc).
  2. S

    Crack developing on ebikeling rim sidewall-- need to repair

    Re above, I often put on a thick pair of gloves and with both hands (a hand at each side of wheel) squeeze the opposite pairs of spokes. I then retention the wheel spokes as they loosen after this. I then repeat again (and again) and retention if necessary. This has worked for me with 14g spokes...
  3. S

    Aluminum Wire Wound Resistors for Load trials

    I usually put my load resistors into a bucket of water if necessary ( voltage was low 50 volts ) I am not sure about those particular resistors but there is a discussion here that might be of interest.
  4. S

    rear hub motor roadside flat repair

    There is a tube available by Gaadi that can be fitted without removing the wheel.
  5. S

    What makes these cheap Chinese chargers so dangerous?

    If I may add to what you said, most/many multimeters anyhow are only specified/guareenteed as accurate at best to about 1% plus one least significant digit. I think you would need a more accurate lab type instrument/meter or calibration reference voltage to measure more accurate than this .
  6. S

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Sorry, it does not have custom firmware.
  7. S

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    It is indeed phase current. It circulates through the motor. Freewheeling/flyback current adds to the battery current and increases torque. As far as I know, at any moment, Phase Current=Battery Current + Flyback Current. Anyhow that my understanding. I have a 9 fet controller and it works great.
  8. S

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Dont forget that extra 'freewheeling/flyback' current over and above battery current is generated caused by collapse of motors magnetic field with PWM and this circulates through (usually I think) the lower set of 3 fets through the body diodes. Doubling up on these 3 FETs as say with a 9 FET...
  9. S

    Are BMS wires junky??

    Just a thought. Sometimes a light thin wire is better in this application in that if it does short, it will burn/fuse quickly and do less harm. I have used thin fibreglass sleeving that was useful as some of the balance wires had to cross over adjacent nickle strips.
  10. S

    Battery speed boost

    Your suggestion reminds me of the 'End Cell Switch' that was used on old 50 volt strowger telephone switch power supplies to boost the battery under load during power failures. Anyhow, it could be implemented something like below in your case but I'm not sure if its a good idea. It would be...
  11. S

    Dumb question: why are there e-power cutoff brakes at all?

    In Europe, there is also a requirement under EN15194 as quoted below. They may not be required with certain torque sensors as they may cut off the power quickly within 2 meters.
  12. S

    Automatic 80% soc cutoff charger?

    I have put diodes in series with charger output that seems to work although it does slow up the switching 'on' of the finish green light. You would probably need two in series.
  13. S

    Attempt: TSDZ2 torque sensor repair, not work :-( any ideas?

    As well as transmitting data, the coils also transmit a small amount of power for the hall sensor in the spindle (like a transformer). Is it possible that the coils turns/turns ratio is different from the original setup as this could possibly result in wrong voltage or insufficient power going...
  14. S

    New Circuit Breaker

    Circuit breakers will typically carry multiples of its rated current for a certain time before it trips (e.g double its rating for 50 seconds)and for this reason I would try to stick with the 63 Amp breaker or only go up one step (e.g 80 Amp) if this is necessary.
  15. S

    PAS does not work but throttle does after KT-LCD upgrade

    C1=2 is setting on last kit I fitted by default and worked. (Previous kits had C1=7). Greenbikekit says C1=6 I think as quoted below for KT-V12L. I hope it helps. https://www.greenbikekit.com/intergrated-e-bike-pedal-assist-sensor-kt-v12l.html
  16. S

    Rear hub motor keeps breaking spokes

    Just my opinion but the spokes look too long at the j bend and are probably too hard and strong to bend and wrap themselves nice and tight around the flange like lighter 14g spokes do when they bed in after prestressing. (I do this using leather gloves to tighten/stress opposite parallel pairs)...
  17. S

    Rear hub motor keeps breaking spokes

    I can see the above works well with single cross. But my motor was a 250W geared 122mm diameter with 2X cross spoke pattern (700c) with the inside cross very close to hub. It looks that will be very untidy in this case with one spoke pushing heavily on the other spoke close to the hole. Will it...
  18. S

    Rear hub motor keeps breaking spokes

    My own experience is that there is way too much dish/offset on some rear hub motors relative to the flange spacing. For example, my first rear hub had 42mm flange spacing with 8mm offset (13g @ 2X) and this gives a tension ratio of 29:13 which is ridiculous (imo). In this situation, its almost...
  19. S

    Suggestions on strong 26" rims and spokes for 1000w hub motor

    I live in Ireland (EU) and no problem buying Ryde rims when they are in stock which is not always the case. I have bought rims and spokes from bike24 on a number of occasions but there are other suppliers...
  20. S

    Unequal power left and right legs

    That's exactly the case with my 36v TSDZ2. I end up using the throttle most of the time. I have the standard firmware that came with bike. Maybe custom software might help, I dont know. My legs tire easily without throttle, as torque sensor need pressure on pedals. I much prefer my hub motor...
  21. S

    New "TSDZ2 Torque Sensor Central Motor"

    I am going to suggest that there is a reference that only requires a clock or stopwatch (and a throttle/way to activate motor at full speed). When the magnets loose strength, there is a reduction of the magnetic field and this has similar effect as field weakening. i.e. 1 Reduction of torque. 2...
  22. S

    New "TSDZ2 Torque Sensor Central Motor"

    Would it not be the case that an unrestricted demagnetised motor would run faster with no load (increase RPM) due to weakening of the field? I have noticed that an older high mileage hub I have appears to run about 10% faster with no load measured with speedo by lifting wheel off ground and full...
  23. S

    2x Speed = 8x Power?

    Hi. My understanding is that its a mistake to treat wind resistance like friction, which is often linear. When a cyclist runs into air, he puts the air particles into motion, very much like a snooker ball striking another. There is a transfer of Kinetic energy from the cyclist to the particles...
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