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Size of a 700c tire

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nameused Offline
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Sacramento, California
Posts: 189
Joined: Oct 2010
Post: #1
Size of a 700c tire
Ok, so I have a friend with a road bike, and his tire blew out (the tire actually has a large gaping hole in it) along with the tube. Now we figured this might be a 26" tire so we went and bought one of those and tried it, but it was too small. So we thought it must be a 27" tire, but that tire was too big. So I went looking online and figured it must be a 700c tire which is between a 26" and a 27". The problem I'm having is that the old tube inside was a 27" x 1/4" and the old tire didn't have any markings on it to show what size it was. The same is true with the front tire and tube. So the problem I have is that I'm not 100% sure it's a 700c tire (more of a mountain bike guy myself) and I'm not sure which width I should get as there seems to be a lot of them. Any help is appreciated.

Here's pictures of his bike if they help any.
   
edit: you can see where the tire eventually ripped through in this picture its on the left side of the back tire. The lighter patch that looks kind of stretched.
   
Mar 19, 2011 03:40 AM
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RBurrelli Offline
Senior Member


Posts: 184
Joined: Jul 2010
Post: #2
RE: Size of a 700c tire
a quick search on Google revealed this...


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Mar 19, 2011 06:36 AM
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Tim M Offline
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Posts: 53
Joined: Feb 2011
Post: #3
RE: Size of a 700c tire
Forget the old tube. I have a hunch the correct tire is 700cm. Look at the tire for some molded lettering something like 38-622. The key is, if you find 622 then it is a 700cm tire. xx-622 is the ISO designation where 622 is the BSD for a 700cm and xx is the width. If you look for "700" molded on the tire, you won't find it.

It's confusing. two presentations, including width issues:

http://sheldonbrown.com/tire-sizing.html

http://smtp.schwalbetires.com/tech_info/tire_dimensions

This may also be a good time to check the rim tape and check for spoke problems.
Mar 19, 2011 09:07 AM
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