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tube size

Old 03-10-07, 12:56 PM
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dave manner
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tube size

is a tube that the box is labeled 27" the same thing as a tube that says 27"???
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Old 03-10-07, 01:06 PM
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TO11MTM
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It Depends.

Typically most modern tubes I've run into are marked as follows:

Example: 26x1.5/2.2

This means that more or less this tube will fit any 26 inch tire between 1.5 and 2.2 inches in width. You can sometimes get away with smaller/larger (E.G. a 1.25 inch tire or a 2.3 inch tire) but you might have issues stuffing the tube in or with the tube wall being too thin from expansion.

Some tubes are labeled like this:

Example: 26x1.75

That would be what some would call a 'nominal' size. It will probably fit the same range of tires as the first example, but it's just marked differently.

I'm ignoring fractional tires for a reason; I don't feel like getting into it. Long story short however typically the tube will stretch to fit.
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Old 03-10-07, 04:20 PM
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UUH? unless the tube of a different size was put into the wrong box then what do you think? A 27" is tube is a 27" tube which will fit in a 27" tire. The only real issue is what is the diameter of the tube, fortunately you have some latitude there.
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Old 03-10-07, 06:06 PM
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dafydd
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the tube may have something like "700 X 28-32" written on it. for all purposes it is the same as 27 1 1/4.
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Old 03-10-07, 06:11 PM
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salsa
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what brand tube is it and where are you buying it from?
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Old 03-11-07, 08:18 AM
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Originally Posted by dafydd
the tube may have something like "700 X 28-32" written on it. for all purposes it is the same as 27 1 1/4.
I use 27 X 1 1/4 Bell tubes from Wal-Mart in my 700 X 38 touring tires. There a perfect fit, only lose 5 Lbs. of pressure in a month, and are three times the thickness of lightweight LBS tubes, which lose 5 Lbs. of pressure a day. Only downside is there heavy.
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