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  1. #1
    Junior Member
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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?

  2. #2
    Galveston County Texas 10 Wheels's Avatar
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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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  3. #3
    Great State of Varmint Panthers007's Avatar
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    What sort of rim are you thinking to put the 25's on?
    How do you keep an idiot in suspense?

  4. #4
    Grumpy Old Bugga europa's Avatar
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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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  5. #5
    Real Men Ride Ordinaries fuzz2050's Avatar
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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 08:42 AM. Reason: formating that graph FAIL

  6. #6
    Great State of Varmint Panthers007's Avatar
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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.
    How do you keep an idiot in suspense?

  7. #7
    Junior Member
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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

  8. #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.

  9. #9
    DRF aka Thrifty Bill wrk101's Avatar
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    I personally would not reuse a tube when I can buy them for $2 each. www.pricepoint.com

  10. #10
    Great State of Varmint Panthers007's Avatar
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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!
    How do you keep an idiot in suspense?

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