Thread: Is 700c and 27" the same?
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Old 04-18-11 | 04:01 PM
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cyccommute
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Originally Posted by FastJake
I've also seen bikes at department stores with ISO 622mm rims labeled 28 inch. Go figure. Presumably they want to make it sound similar to all the other tire sizes (20", 24", 26", etc.)

I too wish all the dumb names be done away with and just use the ISO/ETRTO system.
It comes from the silly method that is used to size the tires. The 'size' is based on the outside diameter of the tire when mounted on the wheel, not on the diameter of the rim. A 27" tire that is about 1" wide (and high) will add 2" to the 24.8" of a 630mm '27"' rim. It's close to 27" outside diameter. If the tire is 1.5" that's very close to 28". A 29er using 2.2" tires adds enough to make them - almost - 29" tall. It's a dumb system but then it's only one thing among many goofy bike things.
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