Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    double diamond tram girl geoGraphicFTD's Avatar
    Join Date
    Mar 2007
    Location
    406
    My Bikes
    surly cross-check, cannondale CAAD8 optimo 1
    Posts
    610
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Tube Sizes: can I use a 23-28 in a 30?

    I'm getting various opinions on this.

    I went to a shop yesterday to get tubes for my 700x30 tire and realized an hour later after the shop was closed that the girl there gave me 700x23-28.
    Two people (one an experienced mechanic) told me this is no problem.
    Three people (one of whom said he used the wrong size before and it blew) told me to go back and get the right size.

    Is there a consensus on this?
    Quote Originally Posted by Brian
    I admire ladies that can post in SS/Fixie.

  2. #2
    biked well well biked's Avatar
    Join Date
    Jul 2005
    Posts
    6,883
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    It should be fine. Ideally, you should use tubes within the right range, but those should work, no problem. I've known guys who, in a pinch, have used 26" mtb tubes with 29" mtb tires (ISO 559 vs. ISO 622), and made it through the remainder of the ride. This is an extreme example, but it gives you an idea of what the typical tube is capable of-

  3. #3
    cyclist/gearhead/cycli... moxfyre's Avatar
    Join Date
    Oct 2004
    Location
    DC / Maryland suburbs
    My Bikes
    Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
    Posts
    4,172
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah, a 23-28 should work just fine in a 30.

    I often use a 19-26 tube in a 32, and it's not ideal because the walls inflate very thin... but it seems to hardly increase the rate of flat tires.
    My bikes | Linux and Python stuff | Photo gallery

    Sheldon Brown, I miss you. Thanks for the advice, ideas, humor, and infectious enthusiasm for everything bikes...

  4. #4
    sch
    sch is offline
    Senior Member
    Join Date
    May 2003
    Location
    Birmingham. AL
    Posts
    2,614
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Mostly a problem on very light tubes, not usually sold in upto 28mm
    sizes. Problem only if the tube has small nicks in it, usually in the
    mm size range that thin out on inflation and pinhole. Some tubes
    have these, some don't, probably has to do with manufacturing
    processes and handling. Not common but happens which is why
    most people get away with size mismatches.

  5. #5
    slower than you Applehead57's Avatar
    Join Date
    Mar 2004
    Location
    dairy country NY
    My Bikes
    Gunnar Road Sport, peugeot UO-10
    Posts
    652
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've never had a problem with that.
    "Lack of opportunity does not constitute virtue". Diana Tickle.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •