There could be many reasons why you are cramping from potassium deficiency, caffeine use, lack of sleep, lack of fitness, lack of hydration, bike fit, heat. Start eliminating your choices.

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Cervélo S2 2012 Red
Great minds think alike... sadly, so do the mediocre ones.

how does quinine work ?

Maybe we should ask Michele Scarponi about recovering from cramps during the race.

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I never took drugs to improve my performance at any time. I will be willing to stick my finger into a polygraph test if anyone with big media pull wants to take issue. If you buy a signed poster now it will not be tarnished later. --Graeme Obree

yeah, please go ask him to join this thread

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weight concerned = good, weight obsessed = bad!

Also, learning how to ride when you're at your limits is important.

At the end of your next long and strenuous ride, find a 3-5 minute climb and drill it as hard as you can. Try to keep yourself right on the limit of cramping. Not only will a few of these intervals help your body adapt, but it will also teach you a lot about how you can moderate your effort at the limit so you don't tip over the edge into 'both-legs-spasm-and-flip-off-the-bike-into-a-ditch'.

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Snacking on carrot sticks - Where did it all go so wrong?
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Finsbury Park CC

Solid advice in here. Wasn't aware that cramps could occur because of all the factors listed above.