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What're all those numbers on my tires?

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What're all those numbers on my tires?

Old 07-20-14, 03:26 PM
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Louis Le Tour
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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?
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Old 07-20-14, 04:05 PM
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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
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Old 07-20-14, 04:43 PM
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Louis Le Tour
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Thank you Charley, that's what I wanted to know.
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Old 07-20-14, 07:59 PM
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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.
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Old 07-20-14, 08:09 PM
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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.
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Old 07-20-14, 08:41 PM
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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.
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Old 07-21-14, 03:26 PM
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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.
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Old 07-22-14, 08:17 AM
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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.
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Old 07-22-14, 08:54 AM
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I second the recommendation to use the late, great Sheldon's website for comprehensive tire sizing information.
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