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I had a cycling nightmare last night. I saw a bubble in the paint on my top tube. When I touched it, it collapsed as the metal has rusted through. The more of the top tube I touched the more of it collapsed until nearly the entire upper part of the tube was gone.
I found a picture I took a few years ago of pre-spring riding in subfreezing temps with wet roads where the water freezes on contact with bike. I only had one ride like that this year but didn't take a picture.