Agreed on Nuun if you are looking for electrolytes only. Zym is very similar. As far as an electrolyte/carb combo, I like First Nutrition EFS the best. It has a higher Na+/K+ amount than many others I've seen. There's also always the DIY route.
Here in FL, where you sweat just walking out the door, I always use electrolytes for rides >1 hr, and electrolytes and carbs > 90 min.



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