I'm currently cycling through Patagonia, and have broken 10 spokes during the last 2000km. All of them in the back wheel on the left side. 8 of them were the ones that pull when you pedal. My wheels have 32 spokes. Only about 600km were on paved roads, the rest on gravel ranging from bad to very bad.
The weird thing is that only the ones on the left side break. The drive side are supposed to break more often, right?
I'm thinking maybe they got damaged when I flew to South America with the bike. In this case, I only have a few more to replace and then they should stop breaking. Or might there be another reason? The wheel has been trued 2 times during the trip and it didn't seem to help.