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  1. D

    Bafang 250w Fat Bike Hub-motor Problem

    I've been helping a guy fix his bike. The battery is fine, it's almost new, as is the rest of the bike. The story is that he fell off the bike and it lost most of its power. I'd estimate the power as around 100w, like it's stuck on level 1. It has independent throttle and PAS. The power is the...
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    Commutation speed KT controllers

    A friend of mine builds cargo trikes. He uses a special motor that's attached/integrated to the differential. It has an output speed of 200 rpm and 10:1 reduction ratio, so 2000 rpm motor speed.He doesn't know how many poles or magnets. He tried the 12 FET KT Sinewave controller (S12S from...
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    New Tiny Motor from Xiongda

    I got the info about these motors from Xiongda today. It doesn't show on their website or anywhere else yet, AFAICS. 1.4kg is significantly lighter than a Q100. I've ordered a couple for testing, so should be able to report more in a couple of months. They would be suitable for anyone who wants...
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    BMSBattery orders

    Anybody ordered anything in the last month? I placed an order about a month ago. I've sent three messages including one through Paypal, but I don't get any replies. I must have about 30 orders in the past, but not had this before.
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    Controller for Ezee motor.

    A friend wants her very old throttle-only Ezee bike converted with a proper PAS and a LCD (ideally). I tried a couple of KT controllers, which both worked perfectly, but backwards. when I alter the wiring to go forwards, the motor runs too fast, like 50 mph, with both controllers. I tried...
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    Reverse motor help needed

    Background: I have a Q128 front geared hub-motor that I want to run at 14S for about 35mph. I needed a disc brake, but the Q128 doesn't have a mounting for a disc, so I had it machined to accept one, but somehow something got mixed up and the disc ended up on the wrong side, so I need to run it...
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    Conversion of Trek Top Fuel 9.9 Carbon Fibre

    A friend of a friend owns a fast car business. His road cars can reach speeds of over 250 mph. he wanted his $6000 Trek MTB converted, and he didn't want it limited to 15 mph. It's not an easy bike to convert because it has front and rear through axles that prevent a hub-drive conversion, and it...
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    BBSHD Error Code 08

    I've just connected my new BBSHD. At the moment, I only have the LCD and the battery connected. I'm getting error code 08 after about 10 seconds. that's without doing anything (stationary). Any ideas before I contact the supplier? I have 5v on the throttle connector.
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    Fitting a BBS02/BBSHD to Trek Carbon Fibre Frame

    A friend has asked me to help him convert his Trek Top Fuel 9.9, which has a carbon fibre frame: http://mountain-bikes.gearsuite.com/l/3154/2012-Trek-Top-Fuel-9-9-SSL Hub-motors are out of the question because the rear axle is a through axle of some sort - no drop-outs. I was looking at...
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    Reversible Clutch

    A few people have posted that they wanted to run a geared motor in the opposite direction. I was playing with a Q100H, when I noticed that the clutch is completely symmetric from one side to the other, so it's a simple job to reverse it. The threads go right through and are equally chamfered on...
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    Battery Charging

    Many OEM bike suppliers advise you to plug the charger into the battery before switching the charger on at the wall. Does anybody know the basis to this instruction? On all the batteries that I've tried that, you get a nasty spark when you connect, which I guess is capacitors in the charger...
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    4-wire PAS

    In my last order from BMSBattery, I got one of their 20A sinewave controllers that goes in the 09 bottle battery. It comes as a kit with included LCD, PAS, etc. The PAS doesn't function. I opened up the controller compartment to see four wires joined to the pcb from the PAS connector, so there...
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    Disassemble a Magic Pie 3

    I'm trying to fix a Magic Pie 3, which has had salty water in it. I have removed the covers. Now I need to remove the stator from the rotor and later reassemble them. I'm a little worried about damaging the magnets when I reassemble it. Does anybody have any tips for how to do this? Before I...
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    BMS for Lipo

    Some people were asking about a BMS for Lipo. I can't find the thread now so I started a new one. I was just browding the BMSB website, when I spotted this new product. I don't know any more than what it says in the listing but it looks promising. 10S - 16S and 50A discharge. Who's going to...
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    Motor Wire Repair on Xiongda motor

    I slipped off on ice. The bike went down and cut the motor wire. leaving me with a difficult repair. Here's what I did: Remove the freewheel from the motor with a freewheel removal tool. I had to smash it round with a lump-hammere. I was hoping that the side-plate would unscrew with it because...
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    Charger Shorting

    I have this charger that had a short in it somewhere. It kept blowing the fuse as soon as I plugged it into the wall. There are 8 components tied to the wall with plates and screws. I thought that one of the plates might be touching a component's leg as they come pretty close, but I couldn't...
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    Controller Speed Limit

    Some controllers have wires that you can connect to limit the speed to 15 mph. How does the controller know the speed if diferent motors have different numbers of magnets and poles and there is no external speed sensor, or is just an approximate speed limit , which is different for each motor...
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    First build, commuter from scratch - advice appreciated!

    The problem with used laptop cells is that you need to test them individually for capacity before using them, which takes a long time. Often, they're worn out, which means that they charge up to 4.2v OK, but they have massive sag and go down very quickly. You only need one cell- group with bad...
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    Waterproof throttles

    My new thumb-throttles arrived today. They look pretty good and have a nice feel. Though not 100% sealed, there's a lip all the way round and the only other place water could get in is through the trigger shaft, which is underneath, so it's highly unlikely water would go in, and in the unlikely...
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    Q100 and Q100C internals

    I stripped down these motors to compare the differences. They're both 201 rpm versions.. The cores with their side-plate can be exchanged between the hubs. The main difference is the width of the core. The Q100C is much narrower, which must affect the power and torque. They're the same...
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    BMS Question

    I'm trying to repair a battery that has one cell much lower than the rest. Looking at the BMS, the positions for the bleed resistors and transistors are empty. I've seen a few BMSs like this. How do they balance the cells, or don't they? The cost of those components would be nothing. Why do...
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    Xiongda 2-speed motor

    I opened one up today, and this is what I found: It opend like a Q100. You remove one of the three screws and replace it with a cap-head screw and washer, then you can lever it round counter-clockwise with a wrench. Inside, it's nearly the same as a Q100. It has two-stage planetary gear...
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    New Crank-motors

    There were new crank-motors everywhere at the Shanghai show. I didn't ask about the power, but I think that they were all for the European markets, i.e 250W. MXUS had one similar to the8Fun one 250 -500w, 24v - 48v. Dapu The Bofelli has een around since the last show. It requires an OEM...
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    2 Speed Xiongda hubmotor

    I have the Xiongda 2-speed motor with internal gearbox. This is to me the most exciting thing since I've been involved with hub-motors. No fancy marketing BS. The technology works and could be adapted to any hub-motor. It's only a 15amp controller, but it can climb steep hills without pedalling...
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    Controller Shunt Experiments

    I measured the voltage drop across the shunt in my controller when 10 amps was flowing from the battery. It was 44mV, so the shunt is about .0044 Ohms, which sounds about right. I cut the shunt and soldered on a 44cm loop of 14g wire, which would have approximately the same resistance. Like...
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