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Question on wheel sizes(4 posts)

Question on wheel sizesAndy
Jul 20, 2001 12:28 PM
I always thought the "c" in the wheel size meant centemeters. Eg. 700c was 700 centimeters. I guess it does not because I did a comparison of a 26 inch wheel to a 650c wheel and although the wheels are similar in size, the 26 inch wheel converts to 660.4 mm (not cm). A 27 inch wheel converts to 685.8 mm.

So... what does the "c" or "cc" in the wheel size mean?
nominal sizes... Sheldon Brown to the rescueDog
Jul 20, 2001 12:30 PM
http://www.sheldonbrown.com/tire_sizing.html
re: Just like buying shoesSpoke Wrench
Jul 20, 2001 3:18 PM
The "c" in 700c refers to the width of the rim as in "a, b, c, or d" width. As an interesting aside, the width also affects the diameter of the rim. A 700d rim has a smaller diameter than a 700c rim.
re: Question on wheel sizesRusty McNasty
Jul 23, 2001 4:22 AM
700 wheels are an older French method of sizing, and the rims are actually 622 mm in diameter. A 27" wheel uses a 630 mm dimeter rim. The "c" is a rim width measurement, but is only a generalized measure.