• Any reason not to use a 700x32-47 tube in a 29x2" tyre?

    Same diameter, right? Just the width of the 700C tube is more like 1.75" than 2" so it'll be more stretched.

  • it'll be more stretched.

    That's the reason not to do it, but it will be fine until something tries to poke a hole in it. The overstretch is well within the limits of the material in the absence of an external attack.

  • Any reason not to use a 700x32-47 tube in a 29x2" tyre?

    Well...

    I have a 27.5 x 1.75 inner tube on a 27.5 x 2.6 tyres, I just can't be arsed to change it.

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