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Tire Size Questions

Old 09-03-05, 07:02 AM
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extravoice
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Tire Size Questions

Hi All:

I recently picked-up a used Trek road bike to supplement (I don't dare say replace) my 19 year old Nashbar road bike. The new bike has metric-sized tires and presta valves, while the old one has English sized tires and Schrader valves.

The wheels on the bike are labelled 700x25C. From reading some online sources, I figured out that the "700" is the tire's diameter, and the 25 is the width of the tire. But, what does the "C" stand for?

On a related topic, I just got a flyer from Performance Bike, and they have lots of 700x23 tires on sale, but only one 700x25. Can I replace my "x25" tire with an "x23"?

As always, thanks!

-Tom
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Old 09-03-05, 07:06 AM
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sydney
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Yeah.......
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Old 09-03-05, 08:12 AM
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Tire and rim sizing nomenclature goes back over 100 years and is truly Byzantine. At one time there were 700A, 700B and 700C rims differing in actual diameter and the tires that fit. There are also three or four differing rims all known as 26" so it's rather confusing. At this point 700C (aka ISO 622) has been standardized and is the only surviving size. BTW, your former 27" wheels are ISO 630.

Several years ago, an organization known as ERTRO (European Rim and Tire Organization) defined rim and tire dimension standards to simplify the situation and their results are now known as ISO standards.

Sheldon Brown's web site has a very good article on this subject and lists all the current and obsolete sizes and their ISO designations.

And yes, 700C x 23 tires will work fine.
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Old 09-03-05, 08:39 AM
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extravoice
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Thank you.
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Old 09-29-05, 05:58 PM
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particleman
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Harris Cyclery said that a 27 x 1 tire would fit their Weinman 630 x 19 rear fixie rim but a chart on their site lists differently..........hmmmmm.

thanks
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