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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-13-14, 11:23 PM   #1
crush93
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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?
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Old 07-13-14, 11:38 PM   #2
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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.
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Old 07-13-14, 11:44 PM   #3
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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").
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Old 07-14-14, 12:00 AM   #4
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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.
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Old 07-14-14, 01:56 AM   #5
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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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Old 07-14-14, 02:03 AM   #6
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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.
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