this post was submitted on 03 Sep 2025
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bike wrench

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Sorry, might be a stupid question, I have literally no idea about bikes!

What I'm looking to do is figure out whether there are any modern-ish ebike motors on the market that I could swap my current motor with (I'm assuming I'd be swapping all the other innards to fit that motor too, so dw about battery compatibility and the like). All I know about the current Motor is that it's a 250W Panasonic motor from around 2011. I asked the mechanic at my bike shop whether I could just toss one of those Bafang conversion kits on the bike but he said the way that my pedals sit within the motor would be incompatible with that and I'd need to get an actual ebike motor, not a conversion motor.

So now I'm trying to find information on current Panasonic motors and what sort of frames they need to fit, but I'm having a hard time because I have no idea how to even call this kind of spacing on the frame. Does anyone have an idea on what to call it/describe it as? Or is is a proprietary thing that I'd need a welder to rework? (Totally an option if push comes to shove, I know a guy)

Some more pictures from as many angles as I could get into (should I be getting measurements of any of these?):

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[โ€“] ExtremeDullard@piefed.social 1 points 1 week ago* (last edited 1 week ago) (1 children)

They're anything but standardardized ๐Ÿ™‚ In fact, that's why you choose them - either because your bottom bracket isn't designed for a motor, or your hub is special or something and won't take a motor either. Usually they come with universal bracketry, but most of the times you're better off getting creative to mount then.

Most of the ones I installed, I installed in my velomobiles because not much is standard in velomobiles either. I usually install a second chainwheel on the left-hand side by threading a new pedal hole in a right-hand side crank and mounting it in reverse, then I install a RHD mid-drive motor to drive the second chainwheel. That way, the regular transmission is totally unaffected. If I want to get really fancy, I also install a second derailleur in reverse to derail the chain off the second chainwheel on the left and totally disconnect the motor, if I want zero drag on muscle-power alone.

All of this is custom hackery obviously...

EDIT: here's an old video I made showing the left-hand side chainwheel and custom disconnector for the mid-drive motor:

https://www.dailymotion.com/video/x3bxatr

For your bike, I'm pretty sure you'll have to go down a similar creative path if you can't find original replacement parts. All that stuff looks custom OEM.

[โ€“] python@lemmy.world 1 points 1 week ago

Makes sense, thank you for the thorough answer! I'll get some exact measurements of my bracket then and see how that compares to the layouts of the different motors out there ^^