Pro tip: I mounted my panniers backwards for 3 months and blamed my knees
I kept getting sore knees on my 7 mile ride to the office in Sacramento and figured I was just getting old. A guy at a red light asked why my panniers were hanging off the back edge of the rack instead of sitting over the axle. That extra weight behind the rear wheel was making the bike wag every time I pushed hard, so I was fighting it with my legs the entire ride. Moved both bags forward that night and the knee pain was gone in about 4 days. Anyone else figure out a dumb setup mistake way too late?