Resurrecting this old thread because I saw these sand-filled tubes today in a building downtown and thought that they would be just the thing to prevent pinch flats. Just strap or glue these up against steel plates, so your wheel will get a bit of cushioning instead.
Road construction firms need to place these up against those big steel plates over holes in the street. pic.twitter.com/jpGXYoPcNG
I don’t think so. The plates are typically about an inch-and-change thick. These sand tubes need to be the diameter that, upon being squished by passing traffic, become only as thick as the plate, effectively forming a tiny ramp a couple inches long, thereby avoiding getting a pinch flat. They do not need to be, and should not be, significantly thicker than the plate.