It's possible that you need more salt - that can help settle the stomach a bit. What gel are you using on the run?

It's easy to bring a little tube of salt with you and take a bit early on or even just when your stomach starts to get a little sour.

Edit, if you are using only gels and powerbars on the bike without extra salt, I think it's very possible you need more. Gels don't often have much in them.

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Ed O'Malley
www.VeloVetta.com
Founder of VeloVetta Cycling Shoes
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