Originally Posted by pgoat
I am figuring that these sudden breakages are being caused by my recent use of a rear rack and 'trunk' for the first time ever, + a 32h rear wheel. I normally have used a 36h rear (and sometimes 32h front) for decades with no issues. i guess the extra 10 pounds or so was the straw that broke the camel's back.
I doubt adding a rack and carrying stuff there instead of on your back did it.
In an earlier post you said this wheel is original from 1993. After 14 years, you might expect one to go, just as a matter of course. Given you had to ride the wheel with the broken spoke, then with the rather interesting interpretation of "true" by the first shop yesterday, I'm guessing the spoke opposite yesterday's broken one simply got overstressed.
The spoke at 5 o'clock pulls against the spoke at 11 o'clock. When you take one out, I wouldn't be surprised if that caused problems with the other.