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  1. K

    Are Cell Spacers Necessary?

    For my next battery build I’ll be looking to stuff as many cells in an EEB frame as possible. I used the standard 21700 cell spacers in my last build but obviously not using spacers would allow a lot more cells in total. I’ve seen people hot glue cells together, then fish tape parallel...
  2. K

    DMHC Controller Tech Sheet

    I have just received a kit from MacmotorTech that comes with a DMHC controller. It looks like it's this: http://www.e-dmhc.com/product?id=10 It's tiny for an 18fet controller! I can't find any tech sheet for it, so I don't know what the max voltage is, I want to use my 52V battery so...
  3. K

    First Hub Wheel Build

    My first thread in a long time..... I'm about to build up a rear wheel (for the first time) using a Mac motor and I will have noob questions I hope the elders can answer. I've never done this before and would have preferred to pay someone else to do it, but the options these days are limited...
  4. K

    Low Power All-In-One?

    Does anyone know of any small low-power all-in-one motors available? Something with the battery and controller inside the motor? There are a few all-in-one's, but they all appear to be larger or more powerful than I would like. Looking for something stealthy that can fit behind a disc rotor.
  5. K

    Mac Side Plates Issues

    I've been running Mac motors for years quite happily with the only issue being replacing a clutch on one motor after a few thousand miles. However, recently the side plates having been coming loose due the screws holding them on, either snapping off the screw heads or just falling out. I've...
  6. K

    Fat Bike Front Fork with Rear Mac Motor?

    Hi, I notice that fat bike front forks have 135mm spacing like standard rear spacing. Has anyone used a rear Mac motor in a front fat fork but run in reverse? If so would the disk brake align with the mount?
  7. K

    First Battery Build 21700 Molicel P42A

    After much deliberation I'm going to build my first cylindrical cell battery. I've been using LiPo very happily for 12 years so I'm very familiar with putting them together using 6S packs. My current 32AH battery made from four 16AH Multistar LiPo is still going after four years, cells never...
  8. K

    Enduroebike Batteries - Anyone bought one?

    Has anyone bought a battery from enduroebike.com ? Prices are reasonable, they use a cell I’m not familiar with Boston Swing 5300mah. Just wanted to know if anyone had any experience (good or bed) ordering from them and specifically if you’ve bought a battery. Thanks
  9. K

    Em3ev no longer selling Mac Motors

    Hi, I’ve searched around but can’t seem to find a thread on this subject. No Mac motors on Em3ev website so I contacted them and they have stopped selling Mac motors! No idea for how long. This is huge as far as I’m concerned, i’ve been buying Macs from them for years. Is there anywhere else...
  10. K

    40Ah Battery Options

    Hi, It will be time for a new battery soon. I’ve been running Multistar 16000mah in 12S2P for a 32Ah 50.4V HOC battery in an EEB frame with a Mac 8T 40A controller since 2016 and to be honest they are still going strong 5k miles later. Although I do notice when it turns cold it really affects...
  11. K

    Hookworm 2.50 Source

    Hi Guys, I've been buying Maxxis Hookworm 2.5 tyres for my bikes for six years now, however, I've just gone to get some more from my usual sources and everyone is either sold out or has a few left but at double the normal price. Has the 2.5 been discontinued do we know? Does anyone know of a...
  12. K

    Kudos Build IV

    I've ordered one of these ebike frames from em3ev which is on it's way, so I thought I would start a build thread. http://em3ev.com/store/index.php?route=product/product&path=47&product_id=209 I think there's a few of us now waiting on the frames to arrive. Roadrash built up this frame...
  13. K

    What Smartphone Apps Do You Use?

    Edit: Suggested Apps List iOS GPSLite MotionXGPS Endomondo MapMyRide Travel SpeedTracker - Ad Supported and Ad pop-ups CycleStreets Runtastic Road Bike / Pro Strava Android OsmAnd CycleStreets ------------------------------------------------------------------------------------------------...
  14. K

    How to measure controller shunt resistance for CA?

    Hi, Well after 3 years of ebiking I've decided to order a Cycle Analyst. Thing is the controller I'm going to connect it to, I painted and so the value that Paul at em3ev wrote on it is no longer legible. I did make a note of it 2.5 years ago but it's been lost since then. So how do you...
  15. K

    LiPo Internal Resistance - When to Ditch?

    I've been trying to find out at what internal resistance a LiPo cell is considered to be past it and should be binned? Can anyone help ? Cheers, Kudos
  16. K

    My Mac Andersons Melted

    I took the bike out the other day to find the motor making a terrible straining noise and power was well down. Thanks to this forum I knew to check the connections first. I grabbed the phase connectors and straight away noticed that two of them were very hot. I tried to pull them apart but...
  17. K

    Anyone tried EM3EV new bottle mount batteries?

    In my on going quest to find a clean looking setup I noticed that the new bottle mount batteries from em3ev look the part. http://em3ev.com/store/index.php?route=product/product&path=35&product_id=161 However, I haven't yet seen any builds on here using them. Has anyone tried them and would...
  18. K

    Charging 7S Lipo

    Hi Guys, You can get 7S lipo from HK that is essentially a 4S and a 3S stuck together with the appropriate 4S & 3S balance leads. I have a 10S iCharger 1010b+ and regularly charge 10S lipo which has two 5S balance leads. It's important to test the balance leads to see which is the 'lower' and...
  19. K

    Controller Questions - Advice Needed

    I have one bike with a HS3540 motor. I also have two Crystalyte Controllers, one is '48V' which I use with my LiPo 12S batteries and the other '72V' which I use with my LiPo 20S battery. However, the 48V controller died after water ingress in heavy rain, which only left me with the higher...
  20. K

    Can I recover drained lipo?

    Somehow I managed to not only leave my lipo battery connected on my bike for a few days, something I never do, but also left the controller on, a double stupid mistake. So anyway my 20s lipo battery made up of two 10s nano-techs register less than a volt per cell. My cellog won't even power...
  21. K

    Cree Light 2.1mm male to 2 female y splitter cable

    Does anyone know where I can get a ready made male to two female 2.1mm connector lead so I can run two cree lights off one battery? The best I can do is a male to male...
  22. K

    The problem of the clean build

    Lots of people ask me to build them an ebike and so far I have resisted, but I am continually questing for a setup which I could give to the average guy. The conundrum is that everything that makes the DIY ebike great, more than 18mph top speed, longer range than commercial bikes, cost. Also...
  23. K

    Heavy Rain Malfunction

    I had to ride 5 miles home in extremely heavy rain and driving wind last night. My bike had been left outside slightly sheltered but still getting rained on. Straight away I noticed that throttle response seemed a bit odd and not linear or immediate. As the ride went on throttle response got...
  24. K

    Which Battery is this?

    Someone asked me to take a look at their electric bike because it isn't working well, it works by pedal assist but doesn't seem to be assisting much. I took a look at the battery and even though it's been charged it was only ready about 0.4 volts. They actually have two of these bikes and tried...
  25. K

    26" MTB Forks with IS disc mount

    Hi, I have miguelleart's front torque arm which I want to use for a 2WD in the future. I need 26" MTB forks with IS mount but I'm finding it really hard to find. Suntour make forks with IS mounts but I can only seem to find 700c forks. Annoyingly CRC were selling some Marzochhi TXC 2 2008...
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