No idea Stefan. Was free wheeling down a hill, changed gear, heard a boom and it was all just hanging there a mangled mess. No doubt everyone will be shouting User Error at me, but it’s my 2nd Vado 4 and I did 4K miles on the first one without any gear issues, this one has done less than 1k. I note that they did change the gears from the 2017 to 2020 model.