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Schwalbe Marathon Plus tire

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Schwalbe Marathon Plus tire

Old 09-12-17, 04:36 PM
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randrm
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Schwalbe Marathon Plus tire

I show a tire size for 38b and 38c. What is the difference?
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Old 09-12-17, 05:25 PM
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This might be an authoritative answer to the Marathon Pro size from the horse's opening.

https://www.schwalbe.com/en/groessenbezeichnung.html
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Old 09-12-17, 05:45 PM
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Originally Posted by randrm View Post
I show a tire size for 38b and 38c. What is the difference?
"38b" and "38c" are not complete tire sizes, they're just widths, so all it really means is "38mm wide". Tire size naming is confusing, so when in doubt try to find the ETRTO spec of the tire (e.g. 40-559), which is clear and unambiguous. 40-559 means 40mm wide with bead seat diameter of 559mm. This would commonly be called '26 inch by 40mm'. Typical bead seat diameters (BSD) in use today are 559 (AKA 26 inch), 584 (AKA 27.5 inch or 650b), and 622 (AKA 700c or 29 inch or 28 inch).

Rims also have a ETRTO spec which indicates which tires will fit on it.

Last edited by tyrion; 09-12-17 at 06:55 PM.
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Old 09-12-17, 06:50 PM
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Originally Posted by tyrion View Post
"38b" and "38c" are not complete tire sizes, they're just widths, so all it really means is "38mm wide". Tire size naming is confusing, so when in doubt try to find the ETRTO spec of the tire (e.g. 40-590), which is clear and unambiguous. 40-590 means 40mm wide with bead set diameter of 590mm. This would commonly be called '26 inch by 40mm'. Typical bead set diameters (BSD) in use today are 590 (AKA 26 inch), 584 (AKA 27.5 inch or 650b), and 622 (AKA 700c or 29 inch or 28 inch).

Rims also have a ETRTO spec which indicates which tires will fit on it.

What are "bead set diameters"? and why is the 27.5/650b less than the 26" BSD?
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Old 09-12-17, 06:57 PM
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Originally Posted by ColonelSanders View Post
What are "bead set diameters"? and why is the 27.5/650b less than the 26" BSD?
Sorry, lots of mistakes in my post. I think I fixed them. "bead seat diameter", not "bead set diameter", and 559mm ~= "26 inch".
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