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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 09-20-10, 01:22 PM   #1
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Tube size for 700x34 tire: 28-32 or 35-38?

Probably a silly question, but I'm putting on new tires that are 700x34, 60-80 psi. Tube sizes at Performance are 28-32 or 35-38. I'm thinking the smaller size should be ok to expand to the 700x34 tire, but don't want it to be too thin.

These are the standard Forte tubes which I've used without problem for years on road and mountain bikes. I don't race, but do ride off road on some local mtn bike trails that have some gravel and rocky sections.

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Old 09-20-10, 01:27 PM   #2
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The 28-32 is more likely to pinch flat. The bigger size would also work.
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Old 09-20-10, 02:04 PM   #3
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Yep, the bigger one will be thicker when it's inflated. A good thing.
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Old 09-25-10, 02:58 AM   #4
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Smaller one - lighter, thinner, probably better if you're racing
Bigger one - heavier, thicker, probably better if you're doing utilitarian riding

They'll both work fine, I've run 23c tubes in my 32c cross tires before because it's all I had in my pack to replace a flat. Take a tube outside of a tire and inflate it sometime - they get big enough.
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