Originally Posted by
Athens80
Another possibility is that your rear derailleur hanger is slightly bent. A bent hanger could result in the derailleur being properly aligned with the smaller cogs but out of alignment with the larger cogs on the cassette.
Your shop can check the hanger alignment for you if you don't have access to the
tool yourself.
Thanks. It had been suggested in a former thread I started when I was tuning the bike. I figured being she had less than 150 miles(literally), and the RD hanger 'looked' OK, all was good but guess it's worth a check. Honestly, as mentioned in my OP, I'm a tad bit OCD. Maybe just to satisfy my curiosity I'll ride it over to the shop and see what they say. I am incredibly oversensitive, both to smells and noises!!