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  1. J

    My Kona Stinky build

    Hi over the years I've owned a couple of ebikes - I worked 25 miles away from home so started with a BBS02 Cube hardtail, the drive failed so built another one and that went too. So I decided to scrap the kid drive idea and bought a cheap DD hub and fitted that..then bought a EEB clone frame and...
  2. J

    Suggestions for motor to fix up my bike

    Last month I got knocked off my bike by an old man that wasn't looking where he was going. My bike came down with a crash and wrecked the motor. I would like to fix the bike up because I enjoyed riding it, although have relocated so don't need it to do the 25 miles that it used to to get me to...
  3. J

    Bike light technical question

    With the nights getting darker I've noticed that my cheap front light just isn't cutting it. I've seen some much better options on Amazon and Ebay but they come with their own (seperate) battery packs. An example is one that is 7.4V 8000mah. Call me lazy but I'd like a solution whereby I can...
  4. J

    Why would battery connector melt?

    My new build has been running smoothly for about 3 months now, but on the way into work today the bike intermittently lost power, the voltage indicator showing a temporary (2 second) drop in voltage. I made it into work and had a quick look around the bike and it appears the problem is from a...
  5. J

    Charger causing tingling sensation through bike frame

    I'm 95% through a new project of mine - my battery is an 18S 24Ah Lipo pack and I've just wired a new connector to a brand new 75V Li Ion charger. Plugged the charger in and it's charging the bike fine and dandy. I go to put my bike lights on while the bike is charging and I can feel a weird...
  6. J

    Replacing my Lipo setup

    Hi all, My setup consists 14S2P Multistar Lipo 16ah giving me 51.8V 32AH nominal. My controller's maximum current is 40A and at this level there's normally a voltage sag of around 3V. Today I noticed while going up a long hill that the voltage sag was much worse than usual and that the cells...
  7. J

    Torrential weather caused weird problem

    Why is it that I always get problems with the bike when the weather is at it's worst?! I thought I did a good job of weatherproofing the bike but maybe that's not the case. Today we had around one month's worth of rain in 12 hours, and I think (but am not sure) it may have something to do with...
  8. J

    Confused about thru axles

    Hi all, I have a question about thru axles - I'm on the lookout for a full suspension frame and it seems most that I'm finding feature thru axles on the front forks and rears. Now from my research, most of the frames I've come across simply have a hole in the rear of the frame, which I'm...
  9. J

    Parallel Charging Lipo question

    Hi I found a thread on here a while back where someone built a 18S2P pack consisting three 6S bricks of Lipo twice. They built a harness so that they could charge all bricks in one go by altering so that the pack broke down into 6S6P (I think). My question is, I am thinking about building a...
  10. J

    Fitting hub motor to downhill frame (no dropouts?)

    Eyeing up a frame, and this one has popped up - but I can't figure how I'd fit a hub motor to it as it doesn't look like it has dropouts. Would it be possible? Here's a photo of where the axle goes - Thanks Jon
  11. J

    Balancing two parallel lipo packs

    Hello, I have built two lots of 14S1P Lipos (comprising 6S, 4S, 4S), and would like to join the two separate packs in parallel to give me 14S2P. Is it a case of just ensuring that the total voltage of each pack is the same (ie. 57.6V charged), then connecting them together using my parallel...
  12. J

    Do lipo batteries lose capacity slowly over time?

    Hi, I am running 14s Multistar 16000mah lipo batteries and was wondering if they will gradually/slowly lose capacity over timr or if they'll fall of the cliff one day? I charge them to 94% and keep them above 22%. They are 10c rated but my controller never pulls more than 2c (most of the time i...
  13. J

    Bafang BBS02 with external controller

    Hello all, in my quest to develop a more efficient bike, I have dug out my BBS02 mid drive and fitted it to my daily commuter. Now, the controller is dead - I know that - so I've hooked it up to my external controller that came with my 48v 1000w hub motor kit. The hall connectors have been...
  14. J

    Will a hub motor in a 20" wheel increase range?

    Hi all I currently run a 48v hub motor in a 26" wheel and get around 24 miles out of a 16ah Lipo pack averaging 24mph - my route includes several inclines. If I fitted the motor into a 20" wheel will this increase my range? Will the increased torque result in less wasted heat on the hills and...
  15. J

    My Cube Analog Disc Commuter

    Hi all just thought I'd post a bit of info about my bike. It's mainly used for commuting, although I try to use it instead of the car whenever I can. My commute is 22-25 miles (each way) and has a few 2-400ft climbs. I use it in all weathers. The bike is nothing special but here goes. 2011 Cube...
  16. J

    Simple Lipo Charging solution

    I'm considering putting together a 12S2P Lipo pack consisting 4 x 6S bricks @ 8000mah, giving 44.4V @ 16000mah total. I know it's probably going to be easier going with another chemistry for ease of charging, but (in theory), would this solution work - - Two bricks connected permanently in...
  17. J

    What would cause a charger FET to blow?

    Hello all, I have a 48V 4A charger that I get my money's worth out of - it's used daily to charge my commuter bike. Earlier this week I plugged it in as usual, there was a spark from inside the charger and it tripped the RCD that it was plugged into, and the main house MCB too. I checked...
  18. J

    Adding screw terminals to pre-screw terminal Headways

    Following on from my recent post, I've discovered it's nigh on impossible to source the pre-screw terminal 38120 headway cells that are already fitted in my battery pack. I like the idea of using the screw type cells as I assume they'll be much easier to maintain than spot welded types if there...
  19. J

    Battery shuts down when connected to controller

    Hi all, I have recently purchased a 48v LifePO4 battery to connect up to my 48v 1000w rear DD hub motor. I have previously used a 48v Li Ion battery which worked fine. I have fully charged the new battery to around 56v but when I hook it up to the controller nothing happens. I have checked the...
  20. J

    BBS02 750w Er 12 Code

    Hi all, Was riding to work the other morning, hit a bump in the road (nothing major, just enough to jolt the bike) and the motor and screen cut out completely. After a long walk (uphill) home, I got my multimeter and checked the output of the battery and found that there was no power at all...
  21. J

    48v 20th LifePO4 battery on ebay

    Hi all I'm building a new ebike to replace my 750w BBS02 mid drive Cube Analog. I have the bike - a Norco Shore 2 DH bike and will be fitting a Crystalyte HT3525 motor once they are back in stock. My question is this - I have found a battery on ebay that looks pretty good but my knowledge...
  22. J

    Replacing BBS02 controller with external 6FET

    Hi all, I have been happily running a BBS02 mid drive install on my Cube Analog for the last 1000 miles when last week it died on me. Electrical diagnosis is pointing towards the controller/mosfets failing. Rather than (attempting to) by a replacement stock controller, I have been reading up on...
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