Hi
What speedo are you using to show correct speed on your deristricted EBikes
Firstly, I do not have or want a derestricted bike.
After once hitting 40KMH on a hill trying to find out how fast my dog could run (faster than 40!), that was enough for me.
On my first e-bike, there was no speedo, so I went and bought one for a normal bike, which I was lucky enough to be able to both test on an accurate 1 kilometer road marking (for a sports event years ago!), and adjust in the speedo firmware to be pretty exact on both speed and distance.
It cost very little. Under 10 UK pounds is the memory!
The adjustment was made simply by adding a variable in millimeters, of the distance covered by one exact wheel rotation.....therefore it takes into account both tyre size and pressure.
Andy