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I want to get some spare inner tubes for my new road bike, but I'm unsure what size to get. On my tire it says the size is 700 x 25c and I know that 25 is the max width of the inner tube. So should I get 700x20-25c or 700x25-32c? I'm guessing 700x20-25c would be the safer option, correct?

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As long as it is in the range you are good. You can even cheat outside the stated range a bit. Too big and you can fold. Too small and you stretch. If it is spare you are going to carry on the bike then the smaller.

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  • Thanks Frisbee and @brendan. I'm going for the smaller one then.
    – Ruben
    Jul 29, 2015 at 4:09
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Either of those inner tubes are fine for that tyre. I'd recommend the smaller size since it's easier to get in the tyre without folds or twists.

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    And also a bit lighter.
    – Michael
    Jul 29, 2015 at 7:34

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