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  1. #1
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    Tire / tube question.

    Would it be ok to use a 700x47 tube with a 29x1.9 tire ?

  2. #2
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    Reputation: J.B. Weld's Avatar
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    yes.

  3. #3
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    Yes it would, you can also use 26" mtb tires in 29" tires. They stretch around the rim just fine.
    Former bicycle mechanic for 8 years, current soil scientist.

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  4. #4
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    Ok .. thanks very much for the confirmation.

    How far up can I go with a 700x47 tube ?

    I also have tires that are 29x2.0 and 29x2.1 ... I wonder if the tube is fit for those sizes ?

    Thing is that I cant find any specific lightweight 29" tubes but I have seen some very lightweight 700 and 26" tubes that might work.
    I already have 700x47 that weigh 95 gr.
    I have also seen some lightweight 26" latex tube that migth work.

  5. #5
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    You could use those tubes on wider tires, probably up to a 2.5 but I wouldn't recommend it- nor would I use a 26 inch tube unless you enjoy getting more flats.

    Ideally a tube inflated just enough to give it shape will completely fill the tire. A skinny tube has to be overinflated quite a bit before it will even contact the inside of the tire. Think of a balloon inflated real tight. Touch it with a pin and it will explode. The same balloon barely inflated has to be pushed much harder with the pin to pop it.

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