Originally Posted by boneshaker
If you're having to stop frequently to pee you're probably taking in more water than your body needs.
Yes, but that depends on how often is "frequently" as well as individual body needs and physical conditions. I think lack of hydration is more often a problem than over hydration, though, especially as exercise periods get over an hour. A few quick pee stops and back to work on a long ride beats bonking, cramping, reduced muscle strength and mental fatigue. There are lots of articles about hydrating for endurance exercise, for example this one