Machka, I agree with you and I don't think it's that easy to say what does or doesn't cause cramps. Why do I have night cramps when I take a day off when I'm in really good shape? That happens like clockwork. Why do I have thumb cramps? A top American woman cyclocross racer had to take part of a season off recently when she couldn't get rid of cramps, that wasn't likely an overuse problem. The other examples aren't overuse issues. I suffer badly from overuse cramps in the spring, usually not later in the year. The overuse cramps are easy to diagnose and fix, ride more. Others, you are lucky if you find something that works. The nice thing is that a lot of things that work, probably because cramps are some weird nervous system thing that doesn't really have a purpose in sustaining human life.