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Old 08-10-10, 08:26 PM   #1
mooshrimp
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27x1-1/4" vs. 700x28-32

I need to replace the tires on my bike, but I'm unsure what size to get. My rims say 27x1-1/4", but when I buy tubes for the tires both 27x1-1/4 and 700x28-32 are the same size tube. Sheldon Brown says they're not the same size, but the guy at the bike store said they were. Will a 700x28-32 fit my rims?
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Old 08-10-10, 08:40 PM   #2
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No. It doesn't matter on tubes, they are basically a balloon you stick inside a tire, and they are the same size.

It matters on tires, A LOT.

Just go buy some 27 1/4 tires, and you are set.
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Old 08-10-10, 08:44 PM   #3
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That's right, the tubes expand to fill a range of spaces. That's why they are listed as being good for both sizes. But the tires have belting and wire in them that locks their size. And of course the rims are whatever size they are. If it says 27 then you need 27's and not 700c.
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Old 08-10-10, 09:09 PM   #4
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OK thanks. I thought so but was hoping not since it's hard to find that size. I should never question Sheldon again.
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Old 08-10-10, 09:17 PM   #5
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Not so hard to find, I ordered mine through Amazon.com - under $10 a tire, came in a week...



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Old 08-10-10, 09:25 PM   #6
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The tyres are not interchangeable, the tubes are.
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Old 08-10-10, 09:54 PM   #7
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Originally Posted by operator View Post
The tyres are not interchangeable, the tubes are.
Not to be pedantic but there is a minor point which might help the OP. Tubes really are different but not by much. It matters more for convenience than applicability. For example, a tube "rated" for a 25mm (1in) tire will fit into a skinny tire more easily than a tube listed for 32mm (1-1/4in). This makes it marginally easier to mount into a skinny tire without pinching the tube. Once the tire is seated however it matters not at all. Well, maybe one is a tiny bit lighter.
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