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General: smaller tubes

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    it's alright to run smaller width tubes on the rims but how's the pressure? There would need to be greater pressure to fill the remaining room making the tube easier to pop right? My tube popped within a day after riding over bumpy conditions of road work.
    • CommentAuthorquidose
    • CommentTimeOct 3rd 2009
     
    Did you accompany your smaller width tube with a smaller width tire? Tubes are rated for tires of a certain size. Running 28s with tubes that are rated for 18s, for example, aren't going to work for you buddy..
  3.  
    wellll i ran 18/23 on my 28 rondeneur and its working just fine for me but i think i ight just be luckyy
  4.  
    i've ran a 700 x 28c tube in a 700 x 23 tire and i've been riding on it for about a month no problems.
    • CommentAuthormmediaman
    • CommentTimeOct 3rd 2009
     
    i had a problem with running 700 x 28c tires (fyxation sessions) on 29er rims that were 25mm wide. i had to run tubes for a 700-35-45 tube to keep them from just exploding under pressure
    • CommentAuthorLyKqiD
    • CommentTimeOct 3rd 2009 edited
     
    Show a picture of the bike with the popped tire and we can tell you for sure....

    why does someone who doesnt own a bike troll a bike forum so much?
  8.  
    Posted By: williamrogersi've ran a 700 x 28c tube in a 700 x 23 tire and i've been riding on it for about a month no problems.
    i ran a 700X23 when my old stock tube was a 700X25. some rough road work probably did the job and now it's dead.
    Are patches any good? I know they're cheap.
    • CommentAuthorwes m.
    • CommentTimeOct 3rd 2009
     
    Patches work but using the right size tube works better.

    Now we know lickedwicked's bike has 700c wheels. Mystery 10% solved.
  10.  
    Posted By: wes m.Patches work but using the right size tube works better.

    Now we know lickedwicked's bike has 700c wheels. Mystery 10% solved.


    Dude we also know it's got a single speed cassette, no brakes (or possibly a brake mounted on the wrong side of the fork), and a hella stretched out KMC chain. I'd say we're more like 25% there.
  11.  
    no its probbably one brake on the back because if he has a brake on the front he will go to hell. plus its dangerous to have a single speed with a front brake. and didnt he say he had a converson a while back or was it that he wanted one because he thought it was safer than a track bike?
    • CommentAuthorAaron C
    • CommentTimeOct 4th 2009
     
    Posted By: carbon fiber15and didnt he say he had a converson a while back or was it that he wanted one because he thought it was safer than a track bike?


    yea, because the wheel wont fall out.
  13.  
    but did he say he has a track bike and wants a conversion because the wheel wont come off, or was he just wondering if it was safer?
    • CommentAuthorbugmcw
    • CommentTimeOct 4th 2009
     
    its because if the chain breaks on track drop outs then the wheel will just fall off... duh
    • CommentAuthorSkidMark
    • CommentTimeOct 4th 2009
     
    Posted By: iron jaiden

    single speed cassette


    You really think he has the knowledge to take apart a cassette leave one cog and put in the spacers and get the chainline right?

    Oh, you meant a singlespeed FREEWHEEL.
    • CommentAuthorLyKqiD
    • CommentTimeOct 4th 2009
     
    single speed cassettes are a bitch, that was the first thing I did with my centurion when I got it. However, since the wheel is dished and you are trying to use the smaller cogs which are on the end of the cassette, it all makes for a wheel which put under enough torque will always slip out of center with the frame. I believe it is because the cog is farther from the center of the hub which puts a horizontal load on the wheel. (that was probably confusing). Using skewers with a single speed cassette conversion is a recipe for disaster.

    Anyways, I am not sure he said he has a single speed just that he loathes people that run a front brake only on them.
  17.  
    http://i34.tinypic.com/nd31g6.jpg
    http://i37.tinypic.com/j0cfv5.jpg
  18.  
    Dude, if you had only posed with your government issue ID and thick string pedals! That's like $15 right there!
  19.  
    Putting tubes that are too small in a larger tire doesn't seem to have much effect, from what I've noticed. I mean, blow up a tube outside of a tire sometime. They can blow up a lot. They'll fill any conceivable tire.

    I've heard that running tubes rated for narrower tires saves a bit of weight but makes them thinner and therefore more prone to pinch flats, but I've also heard people call shenanigans when that was brought up. I suppose someone could do the math — if the cross sectional diameter of a tube increases from a nominal 23mm to 28mm and the walls are a nominal 1mm, how much does the cross-sectional area of the tube decrease by? My shitty math says that it's something like 14% thinner. I'm not sure that's going to have much effect, but then, I'm not sure my math was any good there.

    So, no, it doesn't require higher pressure. The pressure you read on your pump really is the pressure in the tube. And there's plenty of tube to go 'round. If your tube popped after running through a construction area, it could be a little shard of metal, a pinch from hitting a sharp rock, or a thorn that got into your tire last week and just happened to get to the tube when you were riding through the road work. Examine your tube, keeping the orientation to the tire in mind (this is why you put the label of your tire by the valve stem) and see if there was anything poking through at that point. Or, if it's two little parallel lines, it's a pinch, and you rode over something out of spec for the tires.
  20.  
    more room to fill with a smaller tube means more air for a smaller tube. that's more pressure in that tube than it should get for fitting in a tire or rim that's its correct width
  21.  
    The tube will swell to fit the tire at quite low pressures. Think of pumping up an empty tire with a floor pump. The tire will start to lift the rim up from the ground after only a few pump strokes and this can only happen if the tube has filled the tire completely.

    It is not the tube that has to withstand the high pressures, it is the tire.

    That said, a too small tube is more prone to punctures because of the added stretch to the material. When exposed to an outside force, it is more likely to rupture (think party balloon and pin).
    • CommentAuthorRuffinit
    • CommentTimeOct 5th 2009
     
    Hey! Nothing wrong with a Univega! Frame may be a bit on the tall side though. Post 'em up on your profile.

    Nothing wrong with going one size larger or smaller than your tire, but as ragnar said, the smaller the tube compared to the tire means it has to stretch more so the tube wall will be thinner. Kinda like stretching socks too small on your feet and putting them in the same shoe.
  23.  
    finding 25c tubes seems pretty hard so i almost always am running 17-23c tubes and havent really noticed a problem
  24.  
    Posted By: SkidMark
    Posted By: iron jaiden

    single speed cassette


    You really think he has the knowledge to take apart a cassette leave one cog and put in the spacers and get the chainline right?

    Oh, you meant a singlespeed FREEWHEEL.


    In this case I actually meant cassette. :)
  25.  
    lickedwicked for some reason thought it would be smart to say:more room to fill with a smaller tube means more air for a smaller tube. that's more pressure in that tube than it should get for fitting in a tire or rim that's its correct width


    Seriously? Dude, seriously? Did you not read anything else in the thread?

    Fill up a tube without a tire around it. Read the guage on your pump.
  26.  
    Don't be silly, he doesn't have a gauge.
    • CommentAuthorwes m.
    • CommentTimeOct 6th 2009
     
    The real question is... If your chain snaps sending your rear wheel flying away and nobody is there to hear it, should you have had a rear brake?
  28.  
    Posted By: lickedwickedmore room to fill with a smaller tube means more air for a smaller tube. that's more pressure in that tube than it should get for fitting in a tire or rim that's its correct width


    Technically that is correct. In order to get the smaller tube to expand enough to fill the tire you need a higher pressure. But the difference is tiny.
    A normal tube will expand A LOT at really low pressures. For example, running a 23C tube in a 28C tire, the extra pressure needed for the tube to fill the "too large" tire is less than 1 psi. As I said before, as soon as the tube has filled the tire, it is up to the tire to handle the pressure. Tubes do not have pressure ratings, tires do.

    Just for fun, I did a little experiment. I took a normal 26" MTB tube that is nominally 1.75" wide and pumped it up to a 2.5" width.
    The gauge pressure was less than 2 psi.
    • CommentAuthorLyKqiD
    • CommentTimeOct 7th 2009
     
    Posted By: wes m.The real question is... If your chain snaps sending your rear wheel flying away and nobody is there to hear it, should you have had a rear brake?

    That about sums up licked's thought process.
  30.  
    Posted By: Joshua A.C. Newman
    lickedwicked for some reason thought it would be smart to say:more room to fill with a smaller tube means more air for a smaller tube. that's more pressure in that tube than it should get for fitting in a tire or rim that's its correct width


    Seriously? Dude, seriously? Did you not read anything else in the thread?

    Fill up a tube without a tire around it. Read the guage on your pump.
    i never found the comment you posted before helpful. you think you have explained it but you haven't. I think there was more to learn after your post. ragnar.jensen has backed up what i thought was true.
    so next time you take a condescending attitude make sure you are correct or you'll just look stupid like right now after people read this post.
  31.  
    Posted By: wes m.The real question is... If your chain snaps sending your rear wheel flying away and nobody is there to hear it, should you have had a rear brake?
    quit fooling around. the back brake would not do shit to stop you since it won't grip. if you hear your chain snap it's good to have a back brake since you could brake and grip the wheel without it having to roll off.
    • CommentAuthorAaron C
    • CommentTimeOct 9th 2009
     
    lickedwicked: your posts would carry more weight if you could string together a coherent sentence.
    • CommentAuthorLyKqiD
    • CommentTimeOct 10th 2009
     
    Posted By: lickedwickedquit fooling around. the back brake would not do shit to stop you since it won't grip. if you hear your chain snap it's good to have a back brake since you could brake and grip the wheel without it having to roll off.

    This just solidifies your stupidity. Roll off what? Thats what bolts and skewers are for? Do you not ride with them?
    • CommentAuthorSkidMark
    • CommentTimeOct 10th 2009
     
    Here's some weird shit to comprehend: I put a 26 x 1.5 tube in a 26 x 2.125 tire, and after about a day it would deflate. Slow leak, right? I couldn't find one. Submerged it in water, put it close to my ear to see if i could hear the air leaking out, tightened the (schraeder) valve stem. Put it back in and flat in a day. So just out of curiousity I took it out and put it in a 26 x 1.5 tire about 2 weeks ago. It's still holding air, it has maybe lost 5 psi. WTF?
  35.  
    so next time you take a condescending attitude make sure you are correct or you'll just look stupid like right now after people read this post.


    Yep.

    That's me, right here.

    Lookin' stupid.

    Boy, howdy.

    Dude, you're a charmer and a half, and I've defended you before, but I'm beginning to agree with the less charitable of bikers on this forum: I don't think you're a real person. There's no way you could be this flailingly asinine and not have died long ago choking on your own ankle.

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