Re: Video of safety issues
I know the factory drills holes in them to mount water bottles and uses an insert to secure it with alot. I've seen one bike that had 3 water bottles on one bottom tube (2 on top one on bottom)
There ought to be some standard to go by not just guess and hope it works. Thing about those being drilled they are designed for peddling not extreme biking or motorization. I do see your point I think my old schwinn varcity could have been drilled it was like made of iron practically!