Regarding TQ motor grind growl, mine was getting worse and worse and more easily reproducible from 50 miles to 70 miles, but I still had a hard time reproducing it at the local bike shop, and getting them to reproduce it before taking it in. I was fairly certain from other posts that it would need a motor change-out because I thought it was pretty mechanical issue, maybe the sprag gear, as somebody mentioned, not completely disengaging. Or maybe some production part out of tolerance. The shop said they did some software updates, and said something about finding that something, similar to the chain ring, but not the chainring , which was supposed to be torqued to 60, that they found was only torqued to 30. Apparently there are more than one service bulletin, that the shop first told me about. After their service they were not able to reproduce the problem, just now in a parking lot outside the shop I was not able to reproduce it either so maybe it's fixed. I don't know, maybe they don't know either, whether it was the software stuff they did or the retorquing that has worked. I guess it's possible that the software does control the sprag gear or freewheeling mechanism engagement and disengagement ? The shop also said that Trek recommended that after 150 miles the motor would get quieter. My guess is that that is a confused statement, somebody's hearing the actual quiet sound of the motor and complaining about it and Trek says just to wait. I don't think that would be true of the kind of sound that I was getting. My type of sound can be found in two or three videos on YouTube searching for 'Trek TQmotor grind noise". I have a specialized turbo levo SL, a trek rail ,and also now this fuel EXE, and the EXE is wonderful ! ( assuming it's back to its silent condition). ( there is something that looks to me like a metal sprag gear in the exploded view of the motor)... im sorry , it's called sprag clutch. On the exploded view the smaller metallic gear on the far right looks to me like a sprag clutch component that might account for the rattling grinding sound if it's not disengaged.