[bchatt]

I have read that when muscles are simply pushed beyond their "normal operating range" they will cramp. The theory being that training and conditioning can extend the "normal operating range". Assuming hydration and mineral replacement is kept up, the performance of the various muscles we use when riding will improve hugely the more we ride.
Roost, have you noticed if you are cramping less as the season progresses?
For myself anyway, I know at the start of the season, even though I drink heaps, I get lots of cramps - but after more regular riding through the summer, the cramps "barrier" is usually pushed out to say 4 hours.