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  1. #1
    Lifelong wheel gazer ... BookFinder's Avatar
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    Tube size "wriggle room?"

    So klutz here managed to rip a tube at the valve while airing it up.

    Tire size is 700x23c

    Academy Sports carries a pretty wide range of stuff, but they are out of 700x23c's.

    Does the tube have to be an exact match, or can I install a 700x25/32c and get by with it?

    Thanks in advance.

    PS: I hate Presta valves...
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  2. #2
    Senior Member
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    You can install a 25c (mm) tube easily. Anything larger, such as 28 or 32 is going to be more difficult.

  3. #3
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    Easy answer is yes you can use a larger size. The problem is that the over sized tube will tend to bunch up at some point is the tire and cause a bump that will be noticeable. 700x 18/23 tubes are available at ALMOSTany good shop. Find another shop.

  4. #4
    Senior Member Retro Grouch's Avatar
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    Bicycle inner tubes commonly list a range of sizes, like 700 X 25-32 on the box. Given my choice, I'll select the right size.

    If the size that I need isn't realily available, I prefer to use a smaller size tube rather than a larger one. I've never experienced the "bunching up" issue that the other poster mentioned. The problem that I've noted is being able to cram a too large inner tube into a smaller tire. If you pinch the inner tube under the tire bead, which is easy to do if the tube's too big, you're likely to find yourself repeating the process shortly.

  5. #5
    Lifelong wheel gazer ... BookFinder's Avatar
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    Thanks for the feedback. It was worth the time to ask.

    I guess my next question is, "What is the toughest tube available?"

    My primary riding purpose is fitness, so I'm not worried about saving 7 oz on something like a tube. If it is thicker and will last longer, I'm all for it.
    '80's era Cannondale Police bike
    '97 Giant ATX 840 project bike (gave it to a nephew...)
    '01 Giant TCR-1 purebred road bike
    '03 Schwinn mongrel MTB

    Status quo is the mental bastion of the intellectually lethargic...

  6. #6
    Junkmaster
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    Truth is, the tube itself has very little to do with flat resistance.

    As long as the inside is clean and smooth, then flat resistance is purely a function of the quality of the outside tire. Tougher tires last longer.

  7. #7
    Lifelong wheel gazer ... BookFinder's Avatar
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    Thanks. I knew that, or used to.
    '80's era Cannondale Police bike
    '97 Giant ATX 840 project bike (gave it to a nephew...)
    '01 Giant TCR-1 purebred road bike
    '03 Schwinn mongrel MTB

    Status quo is the mental bastion of the intellectually lethargic...

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