Originally Posted by retiredengineer

Sometimes the data has unexpected revelations. On one ride I measured leg angles on myself and the rider I’ve called “Good Rider”. We both measured within some of the recommended ranges, but - looking at the raw sensor data - I was shocked to see the erratic motion of my friend’s leg. He had a serious crash and hip injury many years ago, but I never saw this leg motion as anything except normal. (I think he needs that hip replacement he keeps telling us about.)