Inner tube sizes and what's written on the box
02-21-22, 01:04 PM
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Inner tube sizes and what's written on the box
So I have a tyre that is 44-622 - 28x1.65 - 700x42C. Unfortunately it has gone flat so I'm looking at schwalbe inner tube boxes so I can replace that flat but I need to be sure of something. On the box it says:
40-622 - 28x1.50
42-622 - 28x1.60
47-622 - 28x1.75
But it doesn't say my exact size of 44-622 or 28x1.65 on the box. Logically it should fit my tyre fine by what I remember. Am I to understand correctly that it should fit my tyre fine? I haven't changed a tyre in a year cause I haven't had a flat since and now I have forgotten a little how to read bicycle tyre
. Thanks 
40-622 - 28x1.50
42-622 - 28x1.60
47-622 - 28x1.75
But it doesn't say my exact size of 44-622 or 28x1.65 on the box. Logically it should fit my tyre fine by what I remember. Am I to understand correctly that it should fit my tyre fine? I haven't changed a tyre in a year cause I haven't had a flat since and now I have forgotten a little how to read bicycle tyre
. Thanks
02-21-22, 02:20 PM
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That tube will be fine. Most tubes are designed to fit a range of widths. As long as yours is within the range listed it will work. The 44-622 is the inflated width in mm (44mm) & the diameter of the bead seat of the tire (622mm-also known as 700c, 28" & 29" using different standards) Here's a good article to explain the different sizing standards which are confusing as h*ll if you're not aware. Tire Sizing Systems (sheldonbrown.com) The ISO standard is the most precise as the "inch" system has at least 5 different non-compatible sizes for a "26 inch" tire.
Last edited by Crankycrank; 02-21-22 at 02:27 PM.
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02-21-22, 07:55 PM
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I'll add that labeled sizes are not always the same actual tube dimensions. Today at the local non profit our flat fixer (and general inventory hound) showed us a tube with an inked label of 26x1.5/1.75 and a molded on size of 26x2. Andy
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02-22-22, 08:39 AM
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Inner tubes are very forgiving since they are baloons.
Half the tires I remove from rims I service always have the incorrect tubes.
People just seem to use whatever they have or whatever they can find.
Helps me sell more inner tubes.
Half the tires I remove from rims I service always have the incorrect tubes.
People just seem to use whatever they have or whatever they can find.
Helps me sell more inner tubes.
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02-22-22, 09:49 AM
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Ideally you want the tube to not be so big that it wrinkles or kinks inside the tire/rim. The wrinkles and kinks sometimes can be felt as regular bumps every rotation of the tire and they are points that might be more prone to developing a leak.
Nor do you want it to be so small that it stretches a lot to fill the cavity created by the tire/rim. The more a tube stretches, the more likely it's going to give you quick flats instead of slow flats when something punctures it.
That said there is no standard I know of that says how the mfr's must label their tubes or what dimensions of the tubes must be for what tire. So even if you get a tube that is expressly for a particular size tire. A tube from another manufacturer for that particular size tire might be different.
Nor do you want it to be so small that it stretches a lot to fill the cavity created by the tire/rim. The more a tube stretches, the more likely it's going to give you quick flats instead of slow flats when something punctures it.
That said there is no standard I know of that says how the mfr's must label their tubes or what dimensions of the tubes must be for what tire. So even if you get a tube that is expressly for a particular size tire. A tube from another manufacturer for that particular size tire might be different.
