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  1. #1
    thomas masini lives
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    Does tube size matter?

    Why do manufacturers make so many tube sizes? What is the difference between say a 700c 18-23 and a 700c 23-26?
    not a 2ksuck'r

  2. #2
    cab horn
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    23-26 weighs more and is bigger. Tube sizes aren't really set in stone, they have quite a big leeway - they're just air bladders.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
    slow as I ever was Ex Pres's Avatar
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    Your girlfriend will lie and tell you no
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 620 (nee 600)____ 85 Gianni Motta
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  4. #4
    thomas masini lives
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    If I can blow a 18-23 up to fit a 38 why should there by so many sizes offered inbetween?
    not a 2ksuck'r

  5. #5
    slow as I ever was Ex Pres's Avatar
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    You've stretched and weakened the tube. Just because something works doesn't mean it's the best application
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 620 (nee 600)____ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/blue)__02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

  6. #6
    Call me The Breeze I_bRAD's Avatar
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    Because a 38 won't fit in a 23 tire and a 23 stretched to 38 isn't going to last long- try it and see!

    If it's that or walk I'd try it, but otherwise buy something close to what you want.

  7. #7
    thomas masini lives
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    Quote Originally Posted by Bob Barker View Post
    Just because something works doesn't mean it's the best application
    Is this another thing your girlfriend says?

    Oh, and as of today I'm running 18-23 at 90ish PSI in 35s. Let's see how long they last. Want to start a pool?
    not a 2ksuck'r

  8. #8
    Call me The Breeze I_bRAD's Avatar
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    Quote Originally Posted by doofo View Post
    Want to start a pool?
    Assuming you ride every day, one week tops is my bet.

  9. #9
    Senior Member Bill Kapaun's Avatar
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    Quote Originally Posted by doofo View Post
    Is this another thing your girlfriend says?

    Oh, and as of today I'm running 18-23 at 90ish PSI in 35s. Let's see how long they last. Want to start a pool?
    I've kind of wondered if running noticeably undersized tubes results in faster air loss? It seems like the "pores" would be stretched a little bigger?

  10. #10
    Videre non videri
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    Quote Originally Posted by Bill Kapaun View Post
    I've kind of wondered if running noticeably undersized tubes results in faster air loss? It seems like the "pores" would be stretched a little bigger?
    That is based on the assumption that the air escapes through pores. If the air instead diffuses out through the solid material, then nothing is gained...

  11. #11
    slow as I ever was Ex Pres's Avatar
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    Quote Originally Posted by doofo View Post
    Is this another thing your girlfriend says?

    Unfortunately all I have is a wife of 20 years
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 620 (nee 600)____ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/blue)__02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

  12. #12
    Sister Annie Sianelle's Avatar
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    As a 'get-you-home' any tube that can be folded or stretched to fit inside the tyre casing will do, BUT I would always advise changing it out for the correct size once you do get home.
    OMNIPOTENS aeterne Deus, qui nos secundum imaginem Tuam plasmasti, et omnia bona, vera, pulchra, praesertim in divina persona Unigeniti Filii Tui Domini nostri Iesu Christi, quaerere iussisti, praesta quaesumus ut, per intercessionem Sancti Isidori, Episcopi et Doctoris, in peregrinationibus per interrete factis et manus oculosque ad quae Tibi sunt placita intendamus et omnes quos convenimus cum caritate ac patientia accipiamus. Per Christum Dominum nostrum. Amen.

  13. #13
    Senior Member ken cummings's Avatar
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    I tried a patched 18-25 tube in my 38 tire to save a half mile walk. It blew in 200 yards.
    This space open

  14. #14
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    Quote Originally Posted by CdCf View Post
    That is based on the assumption that the air escapes through pores. If the air instead diffuses out through the solid material, then nothing is gained...
    The rate of diffusion through solid material is controlled by, among other things, path length. A small tube stretched to fit a larger tire will have it's wall thickness reduced and, therefore, the distance the air has to diffuse will be shorter.

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