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  1. #1
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    What're all those numbers on my tires?

    My Surly LHTD sports Schwalbe Marathon Plus tires with the following series of numbers on the side: 47-559 (26 X 1.75) HS 348. I get the "26 X 1.75" alright, what's all the rest of that stuff mean?

  2. #2
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    47 = 47mm width= 1,75"

    559 = effective rim diameter

    HS 348 = probably the model but I don't know for sure

  3. #3
    Senior Member
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    Thank you Charley, that's what I wanted to know.

  4. #4
    Old fart JohnDThompson's Avatar
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    Quote Originally Posted by Louis Le Tour View Post
    47-559
    This is the ETRTO tire specification, the most standardized and sensible of the lot: Nominal 47mm width, 559mm bead seat diameter.

  5. #5
    rebmeM roineS JanMM's Avatar
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    20 x 1.5 does not equal 20 x 1 1/2 in the wacky world of tire sizing. Embrace ETRTO.
    RANS V3 (steel), RANS V-Rex, RANS Screamer

  6. #6
    Senior Member Wogster's Avatar
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    Quote Originally Posted by JohnDThompson View Post
    This is the ETRTO tire specification, the most standardized and sensible of the lot: Nominal 47mm width, 559mm bead seat diameter.
    I agree it makes a lot of sense, where it bugs me, is that they still like to market confusing sizes. For example the idiocy of 29", which is a MTB tire that fits a 622mm rim, it's confusing in that tires under about 50mm/2" are designated 700C and tires larger are designated 29"x so many inches. That gets confusing, because you can't really tell how much wider a 2.1" tire is then a 42mm tire without a calculator, 2.1" is (53.34mm) so it should be designated as 622-53. The worst violator is the idiotic 27.5" size, which is really 650B, 650mm is actually 25.5" so is traditionally considered a 26" size! If you refer to it as 559 ETRTO it stops being confusing.

  7. #7
    Senior Member
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    What is important to remember when buying replacement tires and tubes is the fact that your current tire is 26 inches and is a decimal size. You can mount similar tires which are wider or narrower (within reason) but a 26" X 1+3/4" will not fit your 26 X 1.75 rim. It is similar for tubes. Buy tubes that are meant for the 26" 559 rim.

  8. #8
    Si Senior dbg's Avatar
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    I sure didn't see anything useful in that ETRTO reference. I like Sheldon Brown's link here

    Sheldon Brown's Bicycle Tire Crib Sheet

    BTW, 650B is not 559, it's 584. 650B is a little closer to the 26" MTB size (559) than to the 700C road size (622) --although one can usually convert either MTB or road frames to 650B rims and tires.

    Road frames gain clearance when converted to 650B and can usually run a larger (more comfortable) tire. They would definitely need a different brake setup.

    Interestingly, I have several MTB canti's that can adjust up to a 650B rim (--if someone wanted to convert that direction).
    Last edited by dbg; 07-22-14 at 08:23 AM.
    David Green, Naperville, IL USA "I guess I'll just fade into Bolivian" --Mike Tyson

  9. #9
    feros ferio John E's Avatar
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    I second the recommendation to use the late, great Sheldon's website for comprehensive tire sizing information.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
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