Just an update (for those interested). I really appreciate all the advice.
I rested until Saturday morning, then went with the Proteus group ride. It was a nice easy pace for 18 miles. My knee gave me very little trouble. I got home from that, choosing not to try the faster, longer ride that morning and decided I needed to ride more. I took a easy little 10 mile trip up to REI, where I found a Garmin 800 sensor package on sale! (couldn’t pass it up
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Sunday morning I took another 10 mile, somewhat off-road (on a road bike lol) trip around Bethesda. Again, the knee complained very little. Magically, this morning most of the pain is gone. I just have a bit of IT band pain, which is really typical for me. I continue icing and stretching, and I’m mostly convinced I didn’t actually rip or tear anything. I started to have some pain in the other knee late last week, very similar to the pain I was worried about. I realized that it had to be plain old arthritis pain, and not an “injury” of some sort. The other knee started to hurt because I was walking with more weight bearing on the good knee. I think the little twinge I felt in the kneed that day was my IT band not happy with the longer mileage of the day, and riding with my knees out a bit. I’m concentrating on keeping those things in (AERO!).
getting old sucks.