BTW, another reason I was (am?) considering the full change is to change the crank length. The stock arm is 175 mm, and I wonder if it would be easier on this old man's knees to go with a shorter crank. I've read several posts online (e.g., BikeDynamics - Bike Fitting Specialists - Crank Arm Lengths) that suggest a shorter crank makes higher cadence easier. I have improved somewhat over these two months to an average cadence of about 80 rpm, but much faster makes me feel like a fishing bob. Of course, it might just mean I need to raise or adjust my seat--before I leave for a tour in May, I think I will see about a professional fit.