Sometimes it's the little things that matter. Like today, I noticed this scraping sound. What? Tire rubbing on the rim? Pedals? What could it be. I looked down and noticed a rough patch of fabric on my jogging pants near the upper hip. (wearing them over some compression shorts). They are a light grey so I can clearly see that the fabric is suffering some sort of abrasion. I pedal. Scritch. Scritch. Scritch. Then I see it. The velcro on the zipper seam of my open jacket is falling on my hip with every pedal upstroke, and then un-velcro-ing on the downstroke. Argh. This explains it. Now I remember these strange wear marks on all my biking shorts on the right upper hip. Mystery solved. Phew, feels better.