Joined: Jun 2005
Posts: 9,625
Likes: 40
From: South of Raleigh, North of New Hill, East of Harris Lake, NC
Bikes: Specialized Tarmac, Specialized Roubaix, Giant OCR-C, Specialized Stumpjumper FSR, Stumpjumper Comp, 88 & 92Nishiki Ariel, 87 Centurion Ironman, 92 Paramount, 84 Nishiki Medalist
Absolutely a lack of hydration with electrolytes is the cause of the OPs cramps. The fact that it occurrs at around the same mileage and it's after considerable ride time is the significant clue. My "cramp fail" point is 32 to 38 miles. If I don't hydrate and hydrate with electrolytes, I fail at 32 to 38 miles. It's happened enough that I know I have to drink water with "elete" brand electrolytes in it to continue. On a typical ride, I drink a large water bottle with 20 drops of elete added by 20 miles. If I do that, no cramps, if I don't cramps occur at the predicted time. Actually, drinking just water without the elete electrolytes doesn't help that much, it just postpones the cramps a few miles.
OP, buy elete eletrolyte solution and use it.
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