I finally took my ebike for a test ride.

[PCeBiker]

Not at all how it works...

I think it is, and I shall try to prove it with some empirical data.

And why you're concerned about rpm has me baffled.

It all stems from my motorcycle days.
I remember a kid on an RM 80 that didn't know the motorcycle had more than one gear (or how to shift for that matter)

He just hammered the gas, dumped the clutch, and revved the Living Snot out of it, leaving a Huge blue cloud of two-stroke smoke behind him.

My dirtbike didn't have a tach but I knew how to shift gears and to not bog the engine.

My street bike 🏍 did have a tach and I really did need it.
I couldn't tell for listening when I was near redline.
I would rev it out just listening for what I thought was red line (10,000 rpms) and check my tach and I was barely over 5,000 rpms.

The damn thing was just Fricken Screaming at 10,000 rpms but I knew it was safe because I had a tachometer.
(I used to get it up over 80 kph in second gear, then tap it all the way into 6th gear in one shift)

My car was the same.
I Always looked at my tach.

I drove it very conservatively and rarely went over 3,500 rpms.

Ever month or so, I'd get it fully warmed up, then run it up to redline (6,500 rpm) in first and second gear to blow out the cats and give it a good cardiovascular workout.

I Hated hearing it scream.
I had to stare at my tach and trust it.
It sure sounded like it was gunna Fricken Blow up !!



I suppose a gutless electric ebike motor is different, but I don't know why the motors rpm appears to be proprietary information?

You want efficiency... Stay in the lowest gear possible.

I guess that's easy enough.

It's not like I can over-rev it and blow it up ?
It is voltage limited.

But who know?
I'm sure I can blow it up if I put my mind to it.

 

[PedalUma]

A guy had a motor that was shuddering and had almost no power. I told him he needs a new motor. I installed it today. A Bafang hub. The final step was turning off the battery and connecting the motor. It wouldn't connect. I checked the new pins. Perfect. Nadda. What it was, was that a pin had broken inside the female side. Which reminds me of a joke. That connector arrives tomorrow and I will solder it in.
Here is the joke: A leper visited a street walker. When he was done he said. Keep the tip.

 

[PCeBiker]

A guy had a motor that was shuddering and had almost no power. I told him he needs a new motor. I installed it today. A Bafang hub. The final step was turning off the battery and connecting the motor. It wouldn't connect. I checked the new pins. Perfect. Nadda. What it was, was that a pin had broken inside the female side. Which reminds me of a joke. That connector arrives tomorrow and I will solder it in.
Here is the joke: A leper visited a street walker. When he was done he said. Keep the tip.

So did you sell him a new motor when the problem was a broken pin making intermittent contact?

Here's a tip,..

Keep the old motor.
It's probably fine.
Just needs a new cable.

 

[Gionnirocket]

You can not over rev' an electric motor in this application... But you can bog it down.
The latter should be your only concern

 

[PCeBiker]

You can not over rev' an electric motor in this application... But you can bog it down.
The latter should be your only concern

OK, I'm done exploring that 🕳


I won't be bogging my motor.
I have lots of gears to choose from, and with a 20 mph speed limit, I should be able to stay off my 11t sprocket, especially with my 52t chain wheel.

In a way, I will be bogging my motor starting from a stop with 1 amp, but it's only an amp, and I'm sure the motor will shut me down if it is putting out power but the motor isn't rotating.

My hub motor monitors the speed magnets in the motor housing to make sure the motor rotates.
I get about 3 seconds of power before the motor shuts down due to lack of rotation.

I'm sure the BBS02B has a similar function inside the motor.


I still want to check my chain wheel RPMs with a fully charged battery and a discharged battery for curiosities sake.

Easy enough to do the test.

 

[PedalUma]

So did you sell him a new motor when the problem was a broken pin making intermittent contact?

Here's a tip,..

Keep the old motor.
It's probably fine.
Just needs a new cable.

He purchased the new motor. All the symptoms said, new motor. We couldn't even see the pin issue when brightly lit and took a zoom image. He will keep the old motor as a reserve spare. I could totally splice a pigtail. What is funny is the big beautiful eBike shop downtown does not have a multi-meter, or own a soldering iron. I just noticed that in my second sentence I used two words next to each other one normally would not associate together, Lit and Bright.