I have a habit of swallowing a lot of air during the swim, which shows up on the bike as burps and farts. Popping a gas-x tab at the start of the bike helps a bit.

You could also be gulping down air when you drink, as others have suggested.

Do you ever have the problem in training, and if so do you ride hard immediately after swimming hard?

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-Mark Rebuck, http://www.markrebuck.com/

i get burpee with hydration tablets like nuun etc? do you add those to your mix?