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Old 05-21-10, 08:55 PM   #1
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700 wheels??

I see different sizes in 700 size wheels. Example, my bikes takes 700 wheels.

I see wheels and their measurments are 700x25c, some are 700x28c and I have seen some 700 wheels with 700x2?c.

Can my bike use all 700 wheels and what is that second number?

Thanks in advance,
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Old 05-21-10, 09:27 PM   #2
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The sizes you are referring to are sizes of tires, not wheels. The second number is the nominal width in mm. See for more information.
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Old 05-21-10, 09:35 PM   #3
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They come in like...700x20, x23, x25, x28, x32, x38. Your bike can probably got up and down 2 sizes on that scale. They do come bigger than that, but those are 29er mtb tires usually.
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Old 05-22-10, 01:11 AM   #4
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Typically, there is a maximum width that you can run before the tire starts to hit something on the bike. With road bikes using short-reach calipers that's typically about 25mm or 26mm wide. Also note that a wider tire will be greater in diameter than a narrower tire. A bicycle which can handle bigger tires (700X35mm, for example) can typically handle any tire size smaller than the maximum though this is limited by the rim. Actually, rim width limits useable tire size in both directions -- don't put a real fat tire on a skinny little rim and don't put a skinny little tire on a big honker of a rime either. But a with medium sized rim (maybe 22.5mm) can handle tires from about 25mm to about 40mm which is a wide range of sizes.
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Old 05-22-10, 05:06 PM   #5
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The other thing to consider, is that as you approach the maximum width you can fit in the frame, fitting fenders becomes problematic.
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