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.
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.
@hippy started
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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.