Yesterday I rode a trail and broke two spokes which were on the same side next to each other relative to that side at around the same time after hauling down a trail with some exposed rocks. I usually rode a tire with larger knobbies at less pressure(50ish lbs). This time I rode a tire with much shorter tread and at just over 70lbs of pressure to minimize rolling resistance. This was my first time riding such a high pressure on my back wheel. Thinking about it now, the tire didn't offer as much give. I trued up my wheel alignment and spoke tension a few rides back after breaking a spoke. Over the last three years, I've broken a half dozen spokes on this wheel. After breaking two more yesterday, I'm ready to order a whole new set of spokes/nipples to rebuild the wheel. For my own edification though, would that tire pressure have made any contributions to those spokes breaking? They broke around the same time. I wound them around an adjacent spoke and dropped my tire pressure for the ride back and didn't break any more spokes though I was putting more weight on my front wheel and unloading my rear wheel to be cautious I didn't end up walking.
Appreciate any input.