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Old 01-05-14, 07:17 PM   #1
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27 inch tire sizes....fractions vs 10nths?

I learned the hard way about 26 inch tires......1 1/4 is NOT 1.25.....does this hold true with other tire sizes as well?
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Old 01-05-14, 08:52 PM   #2
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http://sheldonbrown.com/cribsheet-tires.html
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Old 01-05-14, 08:55 PM   #3
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Thanks!
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Old 01-05-14, 08:59 PM   #4
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In 27" there are no decimal sizes, thank goodness. So there is 27 x 1-1/4 but no tire, as far as I know, called 27 x 1.25.
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Old 01-05-14, 09:17 PM   #5
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In 27" there are no decimal sizes, thank goodness. So there is 27 x 1-1/4 but no tire, as far as I know, called 27 x 1.25.
Thats what I thought too; but niagra cycle had a warning in a description stating that a 27 x 1 1/4 was NOT a 27 x 1.25.........

http://www.niagaracycle.com/categori...-1-4-black-gum
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Old 01-05-14, 11:06 PM   #6
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Thats what I thought too; but niagra cycle had a warning in a description stating that a 27 x 1 1/4 was NOT a 27 x 1.25.........

http://www.niagaracycle.com/categori...-1-4-black-gum
That note makes no sense at all!

One exception to Sheldon's cribsheet referenced above: Continental lists the 20" Grand Prix tire as 20 x 1 1/8". Since it fits the 406mm bead seat diameter rim, it really should be called a 20 x 1.125" since 20 x 1 1/8" usually refers to the 451mm BSD rim and tire. This causes a bunch of confusion within the recumbent bike community.

I really prefer the ETRTO rim and tire measurements.
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Old 01-05-14, 11:24 PM   #7
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I really prefer the ETRTO rim and tire measurements.
Agreed, the ETRTO system is definitely superior but unfortunately many sales sites fail to list it.

In addition to problems caused by companies like Continental that violate the decimal vs. fraction convention there's also confusion for tires that are an integer width (i.e. 1" or 2"). Not to mention unsuspecting customers who might think that a 26 x 1.75 tire should be a good replacement for one marked 26 x 1 3/4 (must have spent a couple hours trying to get it on the rim back when I was a kid).
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Old 01-06-14, 06:36 AM   #8
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Thanks for this thread. I am working on a Schwinn World Tourist my sister-in-law dragged home. It needs a rear tire and I worried about the decimal-vs-fractions issue, given that Schwinn 26" tires are weird that way (I was burned by that several years ago), and now basically unobtainable. Kenda makes some, but I can never get them to seat properly - grrrr...
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Old 01-06-14, 06:47 AM   #9
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You need 590mm 26"?

Michelin World Tour are pretty nice. Some can still be tough to seat on some steel rims though.
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Old 01-06-14, 06:57 AM   #10
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Thank you! I thought the Kendas were the only option. Maybe we need a thread to identify all the manufacturers of 26x1-3/8" tires?
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Old 01-06-14, 07:42 AM   #11
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Thank you! I thought the Kendas were the only option. Maybe we need a thread to identify all the manufacturers of 26x1-3/8" tires?
I think there is one somewhere, with about a dozen 590 choices.

Schwinn 597mm tires, on the other hand - Kenda is probably the only choice tbere.
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Old 01-06-14, 08:11 AM   #12
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Crap... Yes, 597. I was a bit distracted by the thought of the walk to the train this morning. Should have left the computer off.
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Old 01-06-14, 08:38 AM   #13
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Originally Posted by noglider View Post
In 27" there are no decimal sizes, thank goodness. So there is 27 x 1-1/4 but no tire, as far as I know, called 27 x 1.25.
http://www.rei.com/product/861128/pa...-tire-27-x-125
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Old 01-06-14, 09:05 AM   #14
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That's an error that REI made. Zoom in on the tire label. It says 27x1-1/4. I haven't seen a 27x1.25 tire anywhere, and my sample size is pretty big.
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