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  1. #1
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    road tube for tubeless 29?

    Can I use 700x25 tubes for emergencies if sealant fails to stop a leak? Tubeless tire size is 29 x 2.0.

  2. #2
    AZ
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    That would be stretching it pretty thin for reliable use. IMHO. A 700x38 might be more appropriate for reliability.

  3. #3
    Former Bike Wrench
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    Well the tube will stretch but be extremely thin...your better off using a 26" tube which works fine in 29" wheels

  4. #4
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by thatdrewguy View Post
    Can I use 700x25 tubes for emergencies if sealant fails to stop a leak? Tubeless tire size is 29 x 2.0.
    Inflate one outside of the tire and see how it expands.

    Tubes increase in circumference much more than in cross section. A 25mm tube is not going to get big enough--especially at the valve--to work well in a 2" tire. I do not even like using a 700x40 tube. Ultralight 26x2.00 tubes work great, though.
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  5. #5
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    Sounds like I better carry a "mtn tube" rather than one from the road, thanks.

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