I bought this bike 2 months ago and the torque sensor has failed twice and been replaced under warranty each time. I thought this hole might have something to do with the torque sensor failures but this is a copy and paste of the response I received from the company:
Rize Bikes (Rize Bikes)
Jun 16, 2020, 10:04 AM PDT
Hello Bill,
Thank you for those photos. I've spoken to my tech guy, and this is the email I got from him:
"Jay,
The hole at the bottom is not melted from the torque sensor. It is purposely there for maintenance and torque sensor installation. There's usually a rubber cover with an acrylic adhesive (black) to protect it from heavy weather elements. We have removed it twice, since we had to replace his torque sensor on two separate occasions. It must've came off during the ride home, because I know 100% I placed it back on, but that's no problem I have extras in the shop. The bike a ridable, I would recommend not riding in rough terrain or heavy rain, where chunks or dirt or rocks can enter through that hole. Again, the hole is meant to be there, you can check the bikes in your showroom and you'll see the other City has it as well."