Originally Posted by
unterhausen
those kind of noises are for when you're obsessively trying to hear them while shaking the bike. Riding, you probably are not going to hear anything. I would reinforce the hole in the downtube
Yeah, but I'm like that

That said, I think the hole leading into the down tube from the bottom bracket shell is large enough that I could push some bubble wrap in there (or something like that) that would keep the wire off of the tube.
Any suggestions for how to reinforce the down tube? I don't think the hole will be very large -- perhaps 5 mm in diameter. But, then again, the only Cross Check I've ever seen fail crumpled right about where the hole will go.