Does Radbike publish IP ratings for the various bike models anywhere?
https://en.wikipedia.org/wiki/IP_Code (https://en.wikipedia.org/wiki/IP_Code)
edit: I found this article for the radrover 6 stating it's IP65 rated:
https://electricbikereview.com/rad-power-bikes/radrover-6-plus/ (https://electricbikereview.com/rad-power-bikes/radrover-6-plus/)