Re: Could this possibly be safe?
If this is ground out too big for your particular frame, you may have to do some creative filling in with a short piece or two of Junk down tube to fill any space or to make the down tube bigger in that very important mount. The motor mounts should have a good solid grasp to prevent tourqe twist. That is the objective here.
I have had to make a motor fit a big tube bike and used the method pictured in your post to make it happen. I never had to make a motor fit a smaller down tube, which is what I understand you need to do.
Last edited by allen standley; 07-19-2016 at 06:07 AM.