Join Date: Mar 2006
Location: Atlanta, GA
Bikes: Kona "The King", Kona King Kikapu, Litespeed Ghisallo, Kona Unit 2-9
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Your pedal stroke should involve some ankle movement (pivoting) as well. I see a lot of riders with a locked ankle which keeps muscles in the calves constantly active rather than pulsing on & off. Eventually the muscle will fatigue and with that be more prone to cramping.
There are certainly a number of other causes too: low hydration, depleted electrolytes, a northeasterly breeze....cramps are tough to diagnose and one of the issues that seems to be surrounded with more myth than science.