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    How to remove spindle on BBS01?

    Hi everyone, I'm trying to get to the bottom of an issue I'm having with a Bafang BBS01, and I can't seem to get the bottom bracket spindle out. All of the instruction videos assume that there's a 4-tab nut on the outside of the unit. That's not the case with mine: What you're seeing is a...
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    Max current for 9-pin motor connectors

    What is the maximum current (and voltage) that the standard moulded 9-pin motor connector can tolerate? I'm talking about this connector: I searched around on the forum, and got unsubstantiated answers between 12 amps and 30 amps. I didn't find any reports of a failure of this connector. I...
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    Roller brake front motor - whines under load

    I bought a small geared front hub motor - I think it's a Bafang - from a chinese alibaba vendor: It's not a motor I've ever worked with before. I'm pairing it to this controller and an LCD from BMS battery...
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    How to eliminate pulsing/cogging on Bafang BBS

    I've played around with a few different BBS0X's, and in general I've found that they're pretty smooth, quiet, quality units. However, the pulsing/cogging in the lower PAS modes at low motor RPMs is driving me crazy! I find this problem is much worse on the BBS02 - I purchased mine (a 36V 500W)...
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    Cute Q100H - not reassembling properly...

    I'm using a Q100H mid-drive for a customized utility bike. I had to cut down the axles, and in the process stripped a screw that then required complete disassembly of the motor to properly fix. The motor seems locked up as I'm putting it back together. Notably, the planetary gears seem to be...
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    Best RC motor for lightweight utility bike build

    Hey all, I’m leading a team of mechanical engineering students building an ebike for a senior capstone project. I live in the pacific northwest (USA), and a recent survey found the top 5 barriers to bicycling in this area are: 1) The weather 2) Places I need to go are too far 3) The hilly...
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    DIY Ebrake sensor - which reed switch?

    Hi, I'm trying to figure out the best way to get ebrake functionality without having to use an actual ebrake lever. I'm tired of these cheap levers, and of course you can't use them for hydro! I've searched the forums for the reed switches folks from here have used, but pretty much all of them...
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    Connecting 10S Li-ion and 12S LiFePO4 in parallel

    Hi, I have an older 10S Li-Ion pack, and a new 12S LiFePO4 battery that I'm currently using 1 at a time on an ebike. Both are 36V nominally, but the LiFePO4 battery has a higher voltage throughout its discharge cycle, and a larger capacity (about 12 amp-hours vs. 8 amp-hours). That said, I'd...
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    Best/most reliable "mini" geared hub motor?

    I run a small electric- and cargo-bike business, and recently started carrying some "250W" geared hub motor kits. They're pretty amazing - at 36V, they give a nice push, they're stealthy and light, and they're efficient. Customers have been reporting 20-25 miles to a charge with 36V, 8.5ah! I'm...
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