Why are these two inner-tubes different lengths?
05-23-11, 10:35 AM
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Why are these two inner-tubes different lengths?
Hello
I have purchased a new 700x28 inner tube (Schrader valve). I am gobsmacked to find that it is at least 1" longer than my existing 700x28 inner tube! It has also proven impossible to successfully fit it on my bike under the tire.
I have compared to all the other spare 700x28 inner-tubes that I own (Schrader and Presta) and it is equally longer than all of them.
I am bemused and am wondering if anyone else has ever come across a longer inner-tube and why this could possibly be the case.
(Apologies for the grainy low-ISO.)
Thanks
I have purchased a new 700x28 inner tube (Schrader valve). I am gobsmacked to find that it is at least 1" longer than my existing 700x28 inner tube! It has also proven impossible to successfully fit it on my bike under the tire.
I have compared to all the other spare 700x28 inner-tubes that I own (Schrader and Presta) and it is equally longer than all of them.
I am bemused and am wondering if anyone else has ever come across a longer inner-tube and why this could possibly be the case.
(Apologies for the grainy low-ISO.)
Thanks
05-23-11, 10:39 AM
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Is the size printed on the tube itself..... maybe someone put the wrong tube in the box ?
05-23-11, 10:48 AM
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Probably a 26" tube or something then, not 700c.
--edit--
Oh, I read your post wrong..... the new one is LONGER than the previous tube. I suppose I could still be right in that someone simply put the wrong size tube in that box, but that would mean that the long tube is probably a 28" (635mm)..... but I don't think those are particularly common and aren't that much bigger than 700c (622mm), soooo......... I dunno, man.
--edit--
Oh, I read your post wrong..... the new one is LONGER than the previous tube. I suppose I could still be right in that someone simply put the wrong size tube in that box, but that would mean that the long tube is probably a 28" (635mm)..... but I don't think those are particularly common and aren't that much bigger than 700c (622mm), soooo......... I dunno, man.
Last edited by MegaTom; 05-23-11 at 10:53 AM.
05-23-11, 11:36 AM
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Old tube on top still has a little air in it, puffing it up making it shorter when laying flat. New tube on the bottom has no air in it allowing it to lie perfectly flat, making it measure longer. Put a little air in your tube before you insert it into the tire on the rim and it will fit fine.
05-23-11, 11:39 AM
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Old tube on top still has a little air in it, puffing it up making it shorter when laying flat. New tube on the bottom has no air in it allowing it to lie perfectly flat, making it measure longer. Put a little air in your tube before you insert it into the tire on the rim and it will fit fine.
05-23-11, 02:54 PM
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For once, Sheldon seems to offer little help, unless it's an old 700A sized tube. Stupid, obstinate french... But worth a look: https://www.sheldonbrown.com/tire-sizing.html
No markings would suggest a very cheap tube, with poor quality control. However, you should be able to install it, just blow it up a very little bit first. AUnless you knot it or pinch it, any wrinkles or folds will be of no consequence once it gets air in it and is covered in a tire. What happens when you try and install it?
No markings would suggest a very cheap tube, with poor quality control. However, you should be able to install it, just blow it up a very little bit first. AUnless you knot it or pinch it, any wrinkles or folds will be of no consequence once it gets air in it and is covered in a tire. What happens when you try and install it?
