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Dumb Tube Question(6 posts)

Dumb Tube QuestionUncleMoe
Aug 6, 2001 10:24 AM
I am a techno peasant, so sorry if this is a trivial question. I got my first flat on my new road bike yesterday. (Not complaining. First one in about 500 miles of riding. A nail)

The size on my tire says 23 622
however...
The size on the tube says 20 622

What do these numbers mean. Should they match?

Also, if you got a flat with a mail puncture thru the tire and into the tube, would you replace the tire too? Its not noticable unless you really really look for it, but it is cut slightly.
not dumb, just confusingakuhn
Aug 6, 2001 11:37 AM
those number don't make much sense to me. tube & tire measurements normally look like 700x23 or 27&1/4" x 1&1/4" I'd guess (it's just a guess) that the 23 & 20 are the second number in a 700x23 measurement and the other number has more to do with the tire and tube's zodiac sign than with the size. (correct me if I'm wrong)

as long as you are within the basic range you shouldn't have a problem. if your tire is a 700x23 then you'll be able to use a tube anywhere from 700x19 to 700x27 (ish) or 27"x1" 27"x1&3/4". Tubes stretch a LOT, tires don't. Either way, the tube should fit into the tire when you put some air in it. (just enough to make it take shape, unless you want a new sno-nut for the kiddies) (I hope SOMEONE knows what a sno-nut is)

As for the cut, it is more of a judgement call, but if you inflate the tube and it pokes through like a bubble and then pops like a shot-gun...you should do something about it. if you can see it at all when inflated, you should do something about it. If you're really cheap, you can use duct tape to patch the inside of the tire and superglue to make a bit of a seal on the outside, but you're probably better off getting a new tire. If you can't see the tube when it is inflated, then it's your call. If you blow another tube in the same spot then you need to do something.
measuring systemfuzzybunnies
Aug 6, 2001 5:03 PM
Due to the vast number of stupid sizeing methods bicycling has come up with, 3 different 26 1 3/8 none of which are equal to 26 1.40 and the c doesn't stand for cm in 700c it's what came after a and b. A new sizing method was created which is based on the diameter of the tire bead. 27"=630 700c=622. Sheldon brown has all the size correllations on his web site. Once it takes full hold it'll be the best way to determine size. TTFN
huhak
Aug 7, 2001 7:02 AM
wow, so basicaly, they took a system that I understood and made it "user friendly" so that now I don't understand it. Thanks a lot you bunch of jerks! If schwinn hadn't screwed it up by making a rim that only works with their tires none of this would have ever been a problem. Thanks to Huffy, we won't have to worry about schwinn anymore :-) If only they'd pur Raleigh on their list of companies-to-buy.
re: Dumb Tube Questiontkohn
Aug 6, 2001 1:38 PM
I may be wrong but I believe that the 622 is the standard diameter of the tire bead and the other is the width.
more or less (nm)Rusty McNasty
Aug 7, 2001 7:21 AM