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  1. #1
    Senior Member FatBottomedGirl's Avatar
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    Safety of stretching latex tubes...

    Hi,

    I have just purchased a set of tires, Continental Force and Attack which is 22mm in front and 24mm in rear.

    I was using Michelin Latex tubes which are specified for 22 and 23mm.

    I know that butyl tubes can be stretched over their official specification (which, in themselves are way wider than for latex).
    Can you do the same for latex? I am thinking about my rear tire which is 24mm?

    Is there a risk of it exploding? Will the extra expansion expand the pores of latex even further which could cause an even faster pressure loss (faster than usual in latex tubes)?
    Are you gonna take me home tonight
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  2. #2
    Senior Member robabeatle's Avatar
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    Have no worries.

  3. #3
    Semper Fi, A way of life. qcpmsame's Avatar
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    You are safe at the small difference, the latex isn't "That sensitive". It is a very small difference for a 23 and a 24mm tire width.

    Bill
    "I Can Do All Things Through Christ Who Strengthens Me" Philippians 4:13

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    Senior Member FatBottomedGirl's Avatar
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    Thanks.

    My worry came from the fact that the "official" stretch is only 1mm (22 to 23) so using it in 24 is doubling it.

    I know I ran a butyl tube 20-28 in a 32mm tire so that's 4 extra mm in a tube that can stretch 8...

    Just explaining my concern...
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    Quote Originally Posted by FatBottomedGirl View Post
    Thanks.

    My worry came from the fact that the "official" stretch is only 1mm (22 to 23) so using it in 24 is doubling it.

    I know I ran a butyl tube 20-28 in a 32mm tire so that's 4 extra mm in a tube that can stretch 8...

    Just explaining my concern...
    Take a close look at a metric ruler at the size of 1mm and then 4mm. You will no longer be concerned.

  6. #6
    Senior Member datlas's Avatar
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    Take a latex condom and blow it up. You will see that latex is very forgiving with stretch.

    Fear not.

    Quote Originally Posted by RUOkie View Post
    never underestimate the idiocy of BF.

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    Quote Originally Posted by datlas View Post
    Take a latex condom and blow it up. You will see that latex is very forgiving with stretch.
    Now you have me wondering if anyone has ever marketed "natural lamb" inner tubes for the improved feel.

  8. #8
    Senior Member FatBottomedGirl's Avatar
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    ok thank you all, I'll give it a shot!

    And as much as I believe to what you lot are saying, I must say I don't quite understand why the butyl tubes "officially" have a wide range (18-25 or 20-28 being frequent standards) while latex's are so narrow (18-20, 22-23... although the MTB ones often do range something like 37-47,...)..

    Is it a marketing thing to send the message: "latex is a very special material designed to be used by very special riders in their best gear, and yes! you the guy with the 23mm tyres, you're that one!!" ??? or some other reason?
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    Quote Originally Posted by FatBottomedGirl View Post
    ok thank you all, I'll give it a shot!

    And as much as I believe to what you lot are saying, I must say I don't quite understand why the butyl tubes "officially" have a wide range (18-25 or 20-28 being frequent standards) while latex's are so narrow (18-20, 22-23... although the MTB ones often do range something like 37-47,...)..

    Is it a marketing thing to send the message: "latex is a very special material designed to be used by very special riders in their best gear, and yes! you the guy with the 23mm tyres, you're that one!!" ??? or some other reason?
    This is purely a guess, but it could have something to do with latex's tendency to loose pressure faster than butyl. Perhaps the narrow rating is an attempt to keep the bleeding to a more acceptable range.

  10. #10
    Senior Member FatBottomedGirl's Avatar
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    ... And that this range is wider on wider tires as the pressure is lower to begin with anyway and so is the bleed?

    Yes, that could make sense...

    If it does, it would at least confirm that I might be concerned for a reason, for a quicker bleed if not safety...
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    Quote Originally Posted by FatBottomedGirl View Post
    ... And that this range is wider on wider tires as the pressure is lower to begin with anyway and so is the bleed?

    Yes, that could make sense...

    If it does, it would at least confirm that I might be concerned for a reason, for a quicker bleed if not safety...
    I only have latex tubes in my tubular racing tires. I tend to check them shortly before the race, of which my longest ones are 2 hours, and have never had a problem. Maybe somebody who does longer rides can chime in on how they do.

    But consider this: no matter what the width a tire is billed at there is still considerable variance from brand to brand and even tire to tire. Also, the effective air volume the inner tube fills is influenced by the rims profile and internal width. Both of these could change things more than the 1mm you are going over with the Force. If that last mm was that important Michelin would need to specify exactly which rims and tires were compatible, too.

  12. #12
    Senior Member FatBottomedGirl's Avatar
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    Quote Originally Posted by canam73 View Post
    I only have latex tubes in my tubular racing tires. I tend to check them shortly before the race, of which my longest ones are 2 hours, and have never had a problem. Maybe somebody who does longer rides can chime in on how they do.

    But consider this: no matter what the width a tire is billed at there is still considerable variance from brand to brand and even tire to tire. Also, the effective air volume the inner tube fills is influenced by the rims profile and internal width. Both of these could change things more than the 1mm you are going over with the Force. If that last mm was that important Michelin would need to specify exactly which rims and tires were compatible, too.
    That does make a lot of sense...

    As for me I intend to use it in racing too (~2hrs) and training (~4hrs) so I hope I should be fine as well...
    Are you gonna take me home tonight
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  13. #13
    Senior Member Looigi's Avatar
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    I don't know how this is relevant but...

    protect your valuables.jpg

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