I'm on my second rim now. I just got this new rear rim about 2 weeks ago and broke the first two the other day. The spokes always break on the left side, the side the motor is on. I have a Staton Robin Subura friction drive. I was told by the local bike shop larger spokes are not an option, they are not available. Has anyone else had this situation? In 2400 miles on bike and motor, I have broken around 12-15 spokes.