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Tube sizing

Violetta has 700×35 Schwalbe Marathon tyres.  I went to the LBS near my work the other day, and they didn’t have tubes for 700×35, but assured me that a 27 x 1 1/4 tube would do the trick.  I was skeptical, because he didn’t seem all that confident about it, but it turns out he was right.  Here’s an article from Schwalbe themselves, with a handy tube sizing chart.

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