Rear Dropout Torque Sensor

DubP · Mar 31, 2020

Hi guys,

I just picked up an old BH EasyMotion Neo City cheap. I discovered it has this sweet PAS sensor in the rear dropout. It seems like it's actually a torque sensor. Does anybody have any info about this sensor?

My apologies if this is exhaustively covered in another thread. I searched, but...

DogDipstick · Apr 1, 2020

Looks like a Sonders style Tq sensor? IDK thou I dont have a Sonders just have seen pics of them.

999zip999 · Apr 1, 2020

Some little thing that jumps around inside I don't know if it's ball bearings or some kind of shaped piece of metal but sometimes it sticks and you got to take a little mallet and tap it and that usually starts working again.

silence · Apr 1, 2020

idBike TMM4

amberwolf · Apr 1, 2020

999zip999 said:
Some little thing that jumps around inside I don't know if it's ball bearings or some kind of shaped piece of metal but sometimes it sticks and you got to take a little mallet in tap it and that usually starts working again.

what does any of that have to do with this thread?

999zip999 · Apr 1, 2020

That's how some of them work. The factory rep told me directly that sometimes you just have to bang it a little bit if not working. Or the possible fix.
He was from stormer I believe.

999zip999 · Apr 1, 2020

Silence great find.

DubP · Apr 2, 2020

Thanks for the info! The Idbike sensor looks exactly like mine, and the website gives specs, so now I know it's a 5V sensor with a 0-5V analog signal. Two things I'm wondering, would I be able to wire this directly to a CA V3, and what the pinout is for 5V, GND, and signal. The controller doesn't work so I can't just check voltage. The wires coming from the sensor are red, yellow, and blue (right side of connector in pic below). Any thoughts how to snoop it?

albe3 · Jul 6, 2021

DubP said:
Thanks for the info! The Idbike sensor looks exactly like mine, and the website gives specs, so now I know it's a 5V sensor with a 0-5V analog signal. Two things I'm wondering, would I be able to wire this directly to a CA V3, and what the pinout is for 5V, GND, and signal. The controller doesn't work so I can't just check voltage. The wires coming from the sensor are red, yellow, and blue (right side of connector in pic below). Any thoughts how to snoop it? IMG_20200401_155035.jpg

I also have a BH bike with rear dropout sensor, it works with a load cell that measures the deformation caused by the chain tension (https://www.youtube.com/watch?v=EJnCtd9qXog&t=301s). the wiring is RED (5 Vdc), YELLOW (gnd), BLUE (signal).

DubP · Apr 17, 2022

albe3, thanks for your response. I obviously missed it when you originally posted, but I still have this bike sitting and was still kinda planning to test out the sensor. Now I'll go ahead and try it with the pinout you suggested.

Voltron · Apr 17, 2022

Pretty sure it's the same as the Stromer uses, so searching some Stromer threads might have info too.

Pic of what's under the cover plate. Theres a tiny Allen screw/spring assembly accessed thru a hole on the forward edge of the dropout that's a sensitivity adjuster.

Rear Dropout Torque Sensor

DubP

10 mW

DogDipstick

100 kW

999zip999

100 TW

silence

10 W

amberwolf

Administrator

999zip999

100 TW

999zip999

100 TW

DubP

10 mW

albe3

1 mW

DubP

10 mW

Voltron

1 MW

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