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Cyclocross and Gravelbiking (Recreational) 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 01-02-07, 01:13 PM   #1
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Tube size

Well over the holidays I got my first flat on my cross bike (damn puncture vine). Anyway when I was changing the tube I noticed that Trek had used road tubes (700 x 19-25) instead of cross tubes. I was told you could use a road tube in a emergency, but that you didn't want to use them in a cross bike for hard riding and racing. What are your opinions on this? I did two races with the road tubes in and never noticed a problem, but if they are more likely to flat or pinch I want them out of there. What is the general wisdom on this matter? Thanks.

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Old 01-02-07, 10:06 PM   #2
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a road tube is lighter, and if you have 30 mm tires or greater, you are more likely to blow out a tire when you get a flat. the smaller tube becomes stretched out almost like a balloon in larger tire size...I would use the correct size tube.
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