Are you saying manually changing the circumference gave you a faster speed before cutoff or it just thinks it’s doing a certain speed when cutoff? But it’s really only doing 25klm anyways?Hope u get well dude, an interesting fact about the cut off speed I realized and now remembered I also need to edit in my review somewhere back in this thread. I was seeing different cutoff speeds with my bike in different modes. Usually it was a bit lower than 25kmh.
Don't know what others were/are using for measuring speed, but I used my thrusty Garmin Fenix 6 watch that I had connected with the bike.
I always thought the speed I see on the watch was GPS speed, well the truth was far from reality. The show speed was the speed based on the connected bikes wheel circumference settings in the cadence/speed sensor. Will explain further...
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The first time I became suspicious was when mid ride I glanced at the watch saying "wheel size calibrated" or something like that. I was like, ok great, didn't bother with it to much.
Well the next ride was a fast one, pushing hard, where I thought the bike had gone crazy, it was assisting up to 27kmh when it cutoff.
Then I started to deep dive into my Garmin and the bike sensors and also did some testing. To my surprise the cadence/speed sensor of the bike has a setting for Manual or Auto wheel circumference calibration in Garmin, that was set to Auto. As this is an mtb it is possible that the Auto calibration on rough terrain isn't very accurate. That's exactly what happened, The saved settings were wrong an so was the displayed speed. During my first test attempts with different max out wheel circumference settings I even thought I have free tuning, as the speed shown was close to 38kmh...but comparing it to GPS speed that was around 25ish I realized the point of everything. It crazy how the mind works when it's fixed on an idea.
I have then set the sensor calibration to Manual and manually entered the correct circumference and since then the cutoff speed was always the same. It is possible that this can/did happen with other cycling computers or third party devices connected to the bike,...etc...
Maybe someone will also have a revelation like me...