Today I installed a Volspeed V4 on my 2021 Orbea Wild FS. It was a piece of cake to install and I can set the assistance speed anywhere between 15.5 to 27.5 MPH. Very easy to turn on and off. I was surprised you can actually engage it while you are riding. Set mine at 22 MPH, which is fine for my style of riding. I’ll update this post if anything goes wrong. I still have 6 months warranty on the Bosch gen 4 CX and would just remove it if I needed to make a warranty claim. I didn’t have to remove the crank arm and completed the job in around 15 minutes.