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I posted this bike about 18 months ago, but I was having trouble with it (and noted this in the initial ad). However, just over a year ago, I had the torque sensor replaced and upgraded to the latest compatible Omni C unit. Since the repair, the bike has worked perfectly - none of the previous...

Has anyone else had trouble getting your Stromer to issue a "New Code" QR code for pairing bike to Omni app? I've got a Stromer ST2S and my dealer recently replaced my torque sensor. It looks like they also updated the Omni C firmware because I found that my iOS Omni mobile app was not...

Hi - I'm curious if you ever sold your ST2S? I'm thinking of selling mine and wondering how the US Stromer market is these days.

Question for this thread. I just cleaned up my TMM4 sensor on my ST2S. I was surprised to see that the fourth screw in the photos above (the one NOT circled in a color) also threads into my TMM4 sensor. The sensor has threads for the rack screw. My ST2S TMM4 sensor definitely has four mounting...

While this may be true - when the sensor output randomly jumps from around 1V no load to around 0.2V no load, that’s not sensitivity. That’s an issue. One that neither I nor the Stromer tech support folks have been able to resolve. My suspicion is bad sensor but given the way they are wired it...

Yes - I've definitely done this (more than once).

Hi ryeo - interesting. I rode my Stromer a few weeks ago and had issues with the torque sensor. These days, I know enough to go into the right secret menu to reset its zero voltage, but this is more than just a shifting output from a sensor. When working, the sensor output is around 1V unloaded...

Yeah, that was this bit that I was referring to: "a Stromer TSB (that I’d have to dig up) on lubricating the head mating surface of certain sensor mount bolts. I’ve done it all"

@ryeo I’ve had intermittent issues with the torque sensor. I un-installed, cleaned and re-installed the torque sensor. I did receive a replacement sticker but when I uninstalled, that didn’t appear to be a significant issue. There is a Stromer TSB (that I’d have to dig up) on lubricating the...

@pmags - congrats, when I was researching bikes a year ago I LOVED the Domane HP+. Enjoy!

@rdv - I would be a little cautious about your power math. I tested the SL1.1 motor as well as the latest from Bosch (Gen 4 or something - can’t remember the details since it has been about a year since I was in research mode) and eventually ended up with a used Stromer and its 500W nominal /...

@Spicule yes, I believe so, and that was my hope / plan. However, I struggled to find a crank arm / spider power meter that was compatible with my ST2S. And I did not want to put ”roads” cleats on my Stromer. Garmin now has the Rally-line of pedal-based power meters, so those will probably work...

Thanks @Ravi Kempaiah - I pulled the rear wheel and cleaned up the sensor a bit. The sticker is starting to peel off (ordered another one from Stromer USA). It is handy to know the service menu secret handshake as now I can at least check on it if things are acting up.

I posted about a torque sensor issue I had back in early March here: https://electricbikereview.com/forums/threads/torque-sensor-question.41234/ Yesterday, I encountered a similar, but different, issue. After the March issue, I have made a practice of calibrating the torque sensor before almost...

@bluecat your final analysis is not correct. If the speed drops from 39 km/h to 20.7 km/h and the total power (300 W = 200 W motor plus 100 W rider), then the torque must increase. So the RPM will have dropped by 20.7/39 = 53% of its previous value and the torque must increase by that same...

"Now ask him to change the assist levels, but keeping the 100W own power. As a result, he will be faster or slower" - correct. If assist is increased, rider will be faster. If assist is decreased, rider will be slower - holding all other variables constant. "and with the formula above, his power...

“The RPM are not a given value, its variable which can change independently from the other values in the equation.” Ah @bluecat but it is a known value. It is a direct drive motor so RPM is locked to bike speed (unless the rear tire is slipping). In the case of the ST2S, the 26” x 2.0” tires...

Thank you @Johnny. It’s funny because my whole drive home I was thinking about the fact that my Stromer tends to add 500-600 W (on average) to my ride. With my missing 2*Pi that would have been over 100 N-m, and I knew the motor couldn’t do that.

Ooops! Missing 2*Pi (Thanks to @Johnny for the correction.): 8 N-m at 300 rpm is NOT 250 W. It is more like NOT 40 W. 300 rpm is 5 rps so 8 N-m at 5 rps is just 40 N-m/s. Multiply by 2*Pi to get 251.3 W. This is what I get for trying to do math in a ski resort parking lot ;) And I think you...

Thanks for the detailed feedback all. I have been meaning to try a few hills without the battery and see what it is like. I know that there is a short steep hill up to my house, and I have tried to climb that hill without assist, and I’ve quit each time :( @Johnny - how would you go about...