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#1
05-04-2016, 06:35 PM
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Am I losing my mind, or is this tire mis-sized?
Am I losing my mind, or is this tire mis-sized? I ordered some 26 x 1-3/8 slicks for my wife's 26" MTB. The diameter of the tires is way too large for the wheel. the 26" designation is on the tag and molded into the tire. Shouldn't inside diameter of 26" tire be about 22 inches?
See pics. Any thoughts? Thanks! 
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#3
05-04-2016, 06:55 PM
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Those are probably 26" tires for a Schwinn rim. Hince the fraction size. 597 or something like that.
You likely need 26" or 26x1.125" or 559 size for a mountain bike rim. There are like 4-5 26" sizes. Sheldon Brown has some info on this.
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#4
05-04-2016, 06:56 PM
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MTB 26" is 559, the key here is the fractional size, eg 1-3/8", MTB are decimal, eg 1.375. I am sure there is somewhere on the internet that explains this way better
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#6
05-04-2016, 07:12 PM
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The tires are in fact the wrong bead seat diameter for your wife's mountain bike. As has already been explained, your wife's mountain bike rim has a bead seat diameter of 559mm. The tires you have are of bead seat diameter 590mm. The tag on your tires shows "MFR #0100704". Referring to the Continental Bike Tires web site, it lists "Article 0100704" as a 37x590 size. Oddly enough, it lists the tire as 26 x 1 1/8 even though 37mm is wider than that.
I'll bet the tires went on easy, though!
__________________
http://hubbardpark.blogspot.com/ Last edited by Peter P.; 05-04-2016 at 07:15 PM.
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#7
05-04-2016, 07:55 PM
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I'm impressed that you can get a quality tire in that size
For those of us raised as a shop rat in a schwinn store, you will remember that there is more than one ERD for 26x1 3/8 tires. I always looked on the old tire to confirm then had to shoo the kids off the velodyne
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#8
05-04-2016, 08:19 PM
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USUALLY, anything with a fraction 1 3/4 or 1 3/8 for example is a Schwinn size for their old rims. I'm surprised to see a good tire in that size. In the 70s this was also the "department store" 10 speed wheel size (Huffy/Murray et al). I have a Schwinn "Typhoon" middleweight 26 x 1 3/4 size, so it's in the memory banks..
As always, Sheldon is the source for good/hard to find and arcane knowledge: "Does Point Seven Five Equal Three Quarters?" http://www.sheldonbrown.com/tire-sizing.html
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#9
05-04-2016, 09:02 PM
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Ah yes.
The S6 and the 590. Sometimes if you were lucky a bike would have a pair of wheels with both sizes. Every schwinn shop had hundreds of schwinn replacement wheels
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#11
05-04-2016, 09:42 PM
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Quote:
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#12
05-05-2016, 06:52 AM
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Quote:
http://sheldonbrown.com/tire-sizing.html Does Point Seven Five Equal Three Quarters? Note that the inch-based designations sometimes express the width in a decimal (26 x 1.75) and sometimes as a common fraction (26 x 1 3/4). This is the most common cause of mismatches. Although these size designations are mathematically equal, they refer to different size tires, which are NOT interchangeable. It is dangerous to generalize when talking about tire sizing, but I would confidently state the following: Brown's Law Of Tire Sizing: If two tires are marked with sizes that are mathematically equal, but one is expressed as a decimal and the other as a fraction, these two tires will not be interchangeable.
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