Ha! I'm less than 86 and pretty active (walk/bike/hike/yoga) with no knee/hip issues so far and hope to be as active as you are in my 80's tooNo, I have noticed no clunkiness at lower PAS levels; in fact, mostly I ride in PAS 1 or 2. Bike is an Ariel Rider C class with a Tongsheng motor and Nexus 7 IGH. I do try to maintain a cadence in the 70 rpms (for which I use PAS minimally, but mostly gear selection). It may be relevant that I am a really old guy (like 86 yo). Maybe e the clunkiness of knees and hips drowns out the clunkiness of the motor, though.