Leg Cramp at high intensity

Sounds like you're not getting enough water. Also what kind of concentrations of Gu2o are you mixing in? Might be a good idea to have at least one bottle of pure water, it's absorbed faster. Usual practice is 24-30oz of water per hour, depending upon the size of your bottles, that may be 1-2 more than you're consuming now.

The effects of dehydration actually affects your brain well before it makes you cramp up like you've been experiencing. You run into a vicious catch-22 circle where your brain can't even tell it's getting dehydrated and you don't feel thirsty, thus not drinking and making the vicious circle spiral downwards even faster.

Then the muscle-cramps sets in as electrolyte imbalances causes improper neurotransmitter function. They're not recycled in the synapses properly. Potassium & magnesium is important for proper operation of your muscles and sodium's important for carb absorption. A lot of runners chew on salt tablets, you can probaby do the same with a drink-mix.

If the cramps are caused by lactic-acid from extreme exertions on the other hand.. the track guys like to do bicarbonate-loading.. You ever noticed near the end of the TDF stages, the riders sip on those little half-size cans of soda? I betcha there's more in there than just Pepsi... 😉

very good post^.
I agree.
You arent hydrated enough.

Try some sport drinks to. Typically work much better then just plain water especially for cramps.