Stromer uses TMM sensors from manufacturer I|D Bike for chain force measurement. The functionality is here described. Numerous models were used throughout Stromer's model history.
Which sensor is installed?
The sensor installed can be viewed in Omni:
- Omni → Menu → System → About or
- Omni Service menu → Sensor type → (active type = red check mark)
Designation:
TMM = Torque Measurement Method
Pxxx = Designation in OMNI
SPx = Sensor designation
If you have any further information or additions, please let us know via the comment field or the Contact form.
I don't know if it will help anyone, but here's a report from me: I fitted a new torque sensor and it works perfectly with the specified mounting torques. Then I fitted the Supernova M 99 pro (not the II, as it needs 12 V - the old one can handle the 48 V of the battery and no converter is needed). There is an SAE plug directly between the battery and the controller near the bottom bracket. So I got an SAE extension cable, cut it and then reconnected it and also connected the power supply for the lamp. I then inserted it between the motor and the controller. There was an error message, but this disappeared after a restart. Contrary to the description, the lamp also goes out when I switch off the Stromer. It does not stay lit for 5 minutes. I now switch the high beam from the right, which I can live with. The lamp is a clear performance gain compared to the standard Roxim.
Now we just need the weather to cooperate! Thank you very much for your support; it helped me a lot.
On the topic of „Light: Conversion front light to Supernova M99 Pro / Pro 2“stands:
„The disadvantage is that the light continues to shine for 5 minutes after the Stromer stops before it automatically goes into standby. “Stromer stops„ means the Stromer's “standby mode„ or locked state. Standby does not mean off. If the Stromer is switched off, the Supernova Pro will also turn off. I will clarify this in the text.
I have a Stromer ST3 with the SPL042 sensor. The support keeps cutting out (and the headlight brightness varies!). I'm now looking for the correct torque specifications for the sensor and the thru-axle to rule out the error. I've chosen 40 Nm for the thru-axle and 10 Nm for the 2 screws of the sensor. Thru-axle first at 40 Nm, then the sensor at 10 Nm. No change. Are there other specifications for this sensor type?
Greetings Thomas
Hello Thomas
The error pattern doesn't necessarily point to the sensor. The variation in lighting could indicate an electrical problem (short circuit). One candidate among the ST3s is the Roxim Z4E Pro front light. There was a batch with problems: See here.
The torque specifications for the thru-axle are here described. The ST3 Pinion has 30Nm for the two TMM sensor plate screws and 30 Nm for the thru axle. The screws for the belt opening have a tightening torque of 10Nm.
Great - thanks a lot for the quick reply! I was so frustrated yesterday that I just ignored the issue for a while.
Today I'm attacking again, I can work with the answer. I have a chain drive, but that shouldn't make any difference regarding the tightening torques, should it?
The tightening torques for the ST3 chain and the P218 (SPL042) sensor have been adjusted. For the axle, 30Nm applies, and for the two screws of the TMM sensor plate, 15Nm each. I also have an ST3 in this configuration and use these values – it runs very well.
Top – thanks again! Can I simply disconnect the Roxim to rule it out as a source of interference for the erratic drive?
Yes, that is possible. The lamp has a JST connector in the stem.
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