I found a flaw in our beloved bike...
Long story short, on New Year's Day we had a group ride. I was following a Tenere and saw his brake light come on for an extended period of time and then noticed a nice smell of cooking brake pads. I flagged him down and we checked it out. After some thorough investigatin' we found a rock that was intermittently getting wedged in between the rear brake pedal and the guard for the rear brake lever. The rock was sitting in the hole in the frame for the swing arm pivot. He never noticed it so it must have just been dragging the brake, but his pads were cooked and it was starting to eat the rotor a little.
Rock was here:
I got home and got to thinking...
Then I went to Lowes. Got a 1 1/2" x 1 7/8" x 1" rubber stopper. Found on the nuts an bolts aisle.
Had to shave a little off the length.
No more rock catcher. Fits snugly but not so tight that it wouldn't come out with a knife.