Originally Posted by
Blanchje
Id be looking at #1 first. Sounds like you need to pre-hydrate better and not wait so long to replace electrolytes.
I drank apx. 20 oz plain water pre-ride and had a bowl of oatmeal. The weather was cloudy with temps in the 50's F.
During that first 40 miles, because of the cooler temps and some drizzle, I likely didn't drink enough, maybe 16 oz. So you could be right.