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Old 01-25-09, 09:29 PM   #1
afbjune
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replacing tires?

if i have 700 x 28c tires, can i replace them with 700 x 25c tires without having to get new tubes or wheels?
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Old 01-25-09, 09:34 PM   #2
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Wheels will be ok.
If you have large tubes as 28's to 35's, they might be to large.
Look at the tubes and see what size they are.
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Old 01-25-09, 09:47 PM   #3
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What sort of rim are you thinking to put the 25's on?
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Old 01-26-09, 01:25 AM   #4
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It shouldn't be a problem. If you're replacing the tyres because they're worn out, I always fit new tubes anyway, but only because they've aged and I've got the tyres off so it's easy to do it then - it's only only a paranoid preventative measure though, not necessary.

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Old 01-26-09, 09:41 AM   #5
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http://www.sheldonbrown.com/tire_sizing.html#width
The size tire that can fit on a wheel is a result of rim width. Inner tubes stretch enough that it doesn't really matter.

Last edited by fuzz2050; 01-26-09 at 09:42 AM. Reason: formating that graph FAIL
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Old 01-26-09, 10:39 AM   #6
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I have some rims that I built (Mavic A719's) for my hybrid. The manufacturer states that 28C is the minimum size. Hence my above question.
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Old 01-26-09, 10:06 PM   #7
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well the tube says 700 x 28/32 and the rims are Weinmann CN-520s with inner width 19.6 so it looks like 25s would be too small acording to the sheldon brown chart
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Old 01-26-09, 10:14 PM   #8
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You might be able to do it. Even if the tubes are too large they will still fit with a tiny bit of work. The rim is a maybe depending on how it was constructed.
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Old 01-26-09, 10:17 PM   #9
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I personally would not reuse a tube when I can buy them for $2 each. www.pricepoint.com
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Old 01-26-09, 10:18 PM   #10
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Do try it. I noted a few problems with Sheldon's chart (I'm going to Hell now - I know it). I have 24.6mm rims. The chart says it can't take a 700 X 28c tire. The manufacturer says otherwise. I've been running 28's all year just great!
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