Having read a thread on thorn resistant tubes, I noticed a number of posts mentioning that the tubes are heavy. They are ten times as thick as an average tube (or so it's advertised) and so I imagine ten times the weight. I wonder, though, how much difference that will make. Both my bike and I could afford to shed pounds (in my case, many pounds), not ounces, and so I'm inclined not to worry at all about a few extra ounces. But tubes are rotating weight and so this may mean more than I think. Will I even notice the difference while inching up steep single track?