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  1. #1
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    Just got a flat tire... Need help on tube size.

    Just had my first flat in Chicago after 789 miles on my Windsor.

    My tire says 700 X 250 (25-622) 28 X 15/8 X 1

    and the tube I bought is 26". Can that still work?

  2. #2
    Grumpy Old Bugga europa's Avatar
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    No. You need a 700c tyre which is a larger diameter.
    The 250 refers to the width of the tyre and you'd imagine you need a 700x25 tube. Apart from the fact that you won't find one, the normal 23mm tubes will do the job very well, even with much wider tyres.

    You seem new to the cycling game. Take your wheel and the tube back to the shop you bought it from. He'll give you the right tube. Ask nicely and he'll fit it for you. Even if he charges you for the work, ask to watch so you'll know how to do it yourself. Tube changes aren't difficult but can be a nightmare until you know how.

    Have fun.
    I had a good bike ... so I FIXED it

  3. #3
    Senior Member
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    Quote Originally Posted by crush93 View Post
    Just had my first flat in Chicago after 789 miles on my Windsor.

    My tire says 700 X 250 (25-622) 28 X 15/8 X 1

    and the tube I bought is 26". Can that still work?
    Yes, in an emergency, but it's far from ideal. The inner diameter of your tire is 622mm and your tube is intended for a tire that's 559mm so it would need to be stretched and that makes it likely that you could trap some of the tube under the tire bead. You don't mention the nominal width of your tube, but most 26" tubes/tires are wider than the 25mm of your tire - that also makes it more likely to have an error in installation and a tube that ends up being pinched and therefore failing.

    If you were far from civilization and this was the only tube around I'd suggest giving it a try - but with lots of options in Chicago you want to get a proper tube that's made for a 700c wheel (27" is also ok) and a tire width of about 25mm (1").

  4. #4
    Quirky Grifter LesterOfPuppets's Avatar
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    Quote Originally Posted by prathmann View Post
    Yes, in an emergency, but it's far from ideal. The inner diameter of your tire is 622mm and your tube is intended for a tire that's 559mm

    Unless it says 26 X 1-3/8", or other fractional size, then it's probably made for 590mm, so much closer to 622.
    Last edited by LesterOfPuppets; 07-14-14 at 02:09 AM.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  5. #5
    Fresh Garbage hairnet's Avatar
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    Quote Originally Posted by LesterOfPuppets View Post
    Unless it says 26 X 1-3/8", or other fractional size, then it's made for 590mm, so much closer to 622.
    No, 26 x 1-3/8" is 590mm. 559mm is the typical mtb 26"
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  6. #6
    Quirky Grifter LesterOfPuppets's Avatar
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    Quote Originally Posted by hairnet View Post
    No, 26 x 1-3/8" is 590mm. 559mm is the typical mtb 26"
    I concur. Not sure which one the OP got

    If he got a 26x2.1-2.3", gonna have a hell of a time getting that into a 25 mm tire

    Maybe I need to snip the quote to make it make sense...
    Last edited by LesterOfPuppets; 07-14-14 at 02:07 AM.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

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