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What Size Tube 28x162?

Old 01-12-17, 08:38 PM
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What Size Tube 28x162?

Have a nearly 30 year old bike with 28x162 on the tire. Don't see that size in any charts for bike tube sizes. What is the modern equivalent tube size for 28x162? See attached picture. Thanks in advance.
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Old 01-12-17, 08:47 PM
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Looks like 28 X 1.62 to me.
So I'm guessing that would be the 28 X 1 5/8 size on this page: Tire Sizing Systems
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Old 01-12-17, 08:59 PM
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Are you sure it doesn't say 26x1.62? What sort of bike is it from?

Got a tape measure? About how wide across is the rim?

Last edited by HTupolev; 01-12-17 at 09:05 PM.
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Old 01-12-17, 09:07 PM
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My initial guess is that it's 559 ISO (26" mountain bike) diameter. But it could also be a 584 ISO (650B/27.5) or 645 ISO (the 28" that English "bobby" bikes used). Given the age, tread and side wall I would eliminate the last and be willing to bet a beer on the %%( size. The 1.62 label was a common way for Asian produced tires to skirt US tariffs which stipulated 1.75, 1 3/4. Thanks to BMA 5 then BMA 6 lobbying efforts in the mid 1970s. Andy
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Old 01-12-17, 09:13 PM
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Looks to me like 26x1.62. MTB of some sort?
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Old 01-12-17, 09:53 PM
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Per this Sheldon Brown article, 28 x decimal inch sizes are wider ERTRO 622mm (700c) tires, also referred to in marketing as "29er". Something like 622x40 or 622x42 tubes should be appropriate. You might find numbers like these elsewhere on the tire. Tire Sizing Systems
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Old 01-12-17, 09:54 PM
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Hard to tell from the picture if that is 26 or 28. Going from memory a 26x1.62 can be replaced by 26x1.75...if it is 28x1.62 then you can use a 700x42C. Again I am just guessing from memory so you might want to check the Schwalbe web site--they used to have a pretty extensive cross reference chart on there.
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Old 01-12-17, 10:29 PM
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HTuplov has it right. Measure across aprox rim diameter. Sutherlands lists 559 ISO as being about 573mm. 584 ISO is about 599mm and 635 about 649mm. Of course with a built wheel an exact diameter is hard to measure. But these numbers will likely home in on the real size.


Then there's the shop method of this rim/tire size question. Trial fit a known tire. Andy.
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Old 01-13-17, 01:41 AM
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I've found a few references to mountain bikes wearing 26" x 1.62" tires, so my hunch is that they're 26" MTB tires with 559 mm beads. (Is there a marking like 41-559 anywhere on the tire? If it's a 26" mountain bike tire, that would be its size in ISO/ETRTO notation.)

If it's a 26" mountain bike tire, you should find plenty of tubes that are sized for 26" x 1.5" or 26" x 1.75" tires. Those would be similar enough in width to a 1.62" tire. If the tires are 30 years old, though, I'd strongly suggest replacing them along with the tubes. My experience with old tires is that they're more prone to failure even though they may look OK.
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Old 01-13-17, 09:18 AM
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One look at the photoed side wall and we can see the age. Also remember that tire sizes are mere labels, NOT actual dimensions. Andy.
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Old 01-13-17, 10:20 PM
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Originally Posted by HTupolev
Are you sure it doesn't say 26x1.62? What sort of bike is it from?

Got a tape measure? About how wide across is the rim?
Ditto. It's a six... which means it's a standard 26-inch mountain bike tire. The tube you're looking for will say 26 x 1.50"-1.75" or similar. Any place that sells inner tubes will have them.

FWIW: a 30-year-old bike isn't that old. Bikes of the '80's accept quite a few "modern" parts. Bikes from the '70's and earlier can get really weird.
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