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Interchanging inner tubes

Discussion in 'Bicycle Mechanics and Repairs' started by Crock of Gold, 1 Jul 2008.

  1. Crock of Gold

    Crock of Gold Guest

    Location:
    London
    A report today said that Science and Maths exams are harder then arty-farty ones.

    As a Literature graduate therefore (!) not only am I in the less intelligent half of the population but am also technically, numerically and common-sense wise illiterate.

    So though I can recite the whole of Othello by heart, know how Keats died and know how to choose a good book to read to the kids I don't understand tyre sizes.

    I have tried to help myself - I've visted Sheldon Brown's site, the CTC site and posts here.

    But I have only 2 questions which I need an answer to.

    Please.

    I have two bikes - one is a wheel size 700x23 (langster), the other a 700x28 (sirrus).

    Does the 700 refer to the diameter? What does the other number refer to?

    Secondly, can I interchange the inner tubes on these?
     
  2. fossyant

    fossyant Ride It Like You Stole It!

    Location:
    South Manchester
    700 wheel size, 23/28 is the width of the tyre.

    Tubes are usually 20/23 and 25/28 - so see what it says on your tubes before shoving a 20/23mm in a 28 mm tyre - it will work, but you'll be overstretching the rubber - therefore more likely to go bang...

    A 28mm will go in a 23mm just, but you might just pinch the tube..
     
  3. Crock of Gold

    Crock of Gold Guest

    Location:
    London
    Cheers...
     
  4. Perry

    Perry Senior Member

    Location:
    East London/Essex
    Great post! :smile:
     
  5. hubgearfreak

    hubgearfreak Über Member


    622 wheel size, with the outer diameter of the tyre being in the range 660 - 700ish