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  1. Q

    6 Bolts or Splined adapter for Bottom Brackets ?

    Hello, I want to use a standart BB (tapered, isis - doesn't matter) as jagshaft. This would require a way to mount sprockets on both sides - unfortunately, cranks only come with 104 odr 130mm bcds, which is too large for small sprockets. So milling a crank is not really an option (besides...
  2. Q

    Drum and Roller brakes

    Looking for a good alternative alternative to disc brakes. They do the job and stop wheels on all our bikes, include the heavy cargo, but at what cost: I find myself constantly readjusting wheels and bending back rotors because they keep grinding on the pads. It seems one hard break a full power...
  3. Q

    Motor cable exit potting ?

    I'll probably have to swap cables on the new g0hs motor and could use some help. 1. The existing cable is very well potted. How can I best pull it out ? 2. What potting material is recommended to seal the motor cable exit ? I have rtv silicone laying around and epoxy. First one seems too weak...
  4. Q

    The high power front hub thread

    Hello, So far, besides that one long john the kids love, I've only build lightweight front driven ebikes (FWD) uprights and would like to move to stronger stuff, to climb steep hills. Hence I would love to collect infos and advices on high power (1000w) front hubs here, as there are many...
  5. Q

    1Kw GEARED hubs finally here: New Bafang g0hs.1000.dc

    New bafang motor: rm g0hs.1000.dc At 5.5kg this thing should be a beast! Check out the data pdf. M14 axle, side exit - all the correct design choice. Only that exotic julet 11pin cable sucks. A 1019 would have been much better. Ordered one; will try to post some pictures upon arrival.
  6. Q

    DH Fork clamps as torque arm ?

    Hello, Has anyone tried to mod one of those DH forks with dual clamps to fit a M14 axle motor ? The idea would be to increase the clamping slot to 10mm to be able to slide in the motor (mill or careful filing), and than stick a custom made shim (M14 to 20mm) on each side of the axle before...
  7. Q

    bafang g310/11 vs aikema 128

    I'm interested into the differences between those two motors: - bafang g311 (front)/g311 (rear) - aikema q128 sx (front) / cst (rear) Construction seems very similar, since both use dual reduction gears though the 128 seems a bit beefier (2.8kg vs 2.6kg) and is a few years older. Did anyone try...
  8. Q

    Electrify this ?

    I found this little jewel second hand: 16" front wheel with a dyno and 20" rear wheel relaced with an alfine 8 IGH. Slapped a bbs02 in and it worked fine... but I grew to dislike sharing pedal power with a motor and would like to move to something different. Since I want to keep the new...
  9. Q

    Please help me understand this

    Hello, I've been playing around with ebikes.ca's motor sim, and stumbled upon this. How is it possible that a 9c 212 with only 56 poles reaches nearly the same climbing efficiency of a 10% slope than the infamous bionx D with 88 poles ? Sure the 212 has twice the stator width than the bionx...
  10. Q

    cav3 + phaserunner config questions

    Hello, Long time diy builder, but pretty new to this cav3 + phaserunner stuff. Could use some help. The setup is rather simple: long john, front fh212 dd hub, phaserunner, 2x 13s5p batteries and a torque sensor. Motor autotune worked fine, torque sensor also. Overall, the cargo bike moves, but...
  11. Q

    Help me repair a Lyen Chie Infineon Controller

    Hello, I have one of those elderly infineon controller, repackaged by the german seller ebs. Worked fine but my new front hub motor was running backwards. So I went through the trouble of figuring out the right phase / hall combination, when it suddenly stopped working. No idea what went wrong...
  12. Q

    New geared hub motor trend: go big!

    Has anyone followed the latest trend of chinese GEARED hub motors ? It seems bigger and heavier is the new motto. Here 2 examples: - The Bafang H640 5.5 KG! Seriously. - Hengtai/hentach: 5.9Kg! Hengtail also makes that famous nylon/metal gears which are supposed to be stronger. I guess...
  13. Q

    New freehub for bafang hub motor

    Hello, Has anyone ever replaced the freehub unit (where you mount the cassette) from a bafang g360.500 hub motor ? Mine turns out to be so wobbly that the chain keeps falling of the smallest sprocket. Replacing it with a better model would certainly help a lot. I'm used to cheap freewheel...
  14. Q

    Coil Spring connectors ?

    Hello, Has anyone come up with a practical way to use spring coils as serial connector between cells in large battery packs ? It's quite common in cheap 1 to 4 cells holders, but I have never seen a large pack built with such a system. The reason I'm thinking about building one is because the...
  15. Q

    New Mahle Motor ?

    Has anyone followed the hype around the new mahle motor ? Looks to me like a fancy induction motor. Other than that, how on earth is this thing supposed to be more efficient than a pmsm motor, using wireless power transmission and 2x induced magnetic fields instead of 1. Any feedback is most...
  16. Q

    Nexus 5 IGH experience ?

    Hello, Has anyone tried the new shimano 5 speed internal geared hub with a bbs02 or hd ? Is is as smooth and quiet as an alfine 8 ? thanks for your time, qwerkus
  17. Q

    FH212 DD hub repair

    I have a strange problem with a nine continent FH212 motor. One of the halls died due to a short and I replaced all three with brand new ss41. Closed everything, tested each hall with a 5V psu and all seemed good. Phases not shorted either (no resistance turning the wheel when the controller is...
  18. Q

    Fuses behind a BMS: what's the point ?

    I keep seeing packs with an automotive fuse sitting behind a bms, and I wonder what's the point. Even in a pure redundancy scenario, a proper bms will trigger an OCP way before the fuse would melt, and die if the OCP fails. Even in that extreme case, the main discharge would be instantly cut...
  19. Q

    FEM Dropout analysis - max force ?

    Hello, I'm trying to setup a simple FEM static analysis of a bike dropout to figure out metal breaking point. Model is done and software seems to work. Though I could use some help with the physics. For an instance, what's the max. force a 12mm hub motor axle edge would put on a dropout face...
  20. Q

    EU only - Legality ? Share your experience.

    As ebike numbers increase, more accidents happen. As a results, several EU countires have pushed so called anti-tuning laws forward, like France recent L317-1: https://www.bike-eu.com/laws-regulations/nieuws/2020/03/e-bike-tuning-now-banned-in-france-with-30000-euro-fine-10137459 This type of...
  21. Q

    Controllers ?

    Guys - we need a reliable cost effective controller solution. Those chinese controllers (KT, Lishui and else) are a pain to work with and keep frying (at least for me). On the other end we have premium GRIN stuff and ASI or Kelly which are great but not really cost effective on a cheap ebike...
  22. Q

    Recommended battery / BMS tester ?

    Anyone knows a good piece of hardware to analyse a battery pack, including bms errors ? Right now all I'm doing are charge cycles with periodic manual voltage measurements and, well, not much actually to check for bms defects! Either it works or it meets the e-trash bin...
  23. Q

    bbsXX torque sensor hack

    After years trying different motors, I still think the bbs02 is the best/simplest solution for large wheel diameter (26"plus) bikes that have to climb hills. It simple (motor + gears + controller all inside the casing), quiet and super sturdy for a decent weight. The only major drawback in my...
  24. Q

    E-Trike Design: Balloon Tires vs Dedicated suspension

    Hello, I'm working on a Delta trike and was going for a full suspension dual wishbone design, when I realized for that price I could build 2x sturdy FWD Deltas without suspension but larger tires instead. Here the current status of the fully: Expected advantages are: comfort, better...
  25. Q

    System keeps shutting down

    So now that the motor is finally spinning in the right direction, the bike is nearly finished, and I took it out for a test ride. Unfortunately, it keeps shutting down. There are 2 types of different shutdowns: either the controller just cuts power but stays on, or everything shuts down. In the...
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