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  1. #1
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    Please Help! New To This. Bump On Wheel

    Hello everyone, i am new to this website and i wanted to see if i can find some help ASAP
    So i noticed every time i replace a inner tube and inflate everything, i spin it just to make sure its good and i notice there is like a bump on the wheel, it kind of goes up and down. So i deflate it and check the spot yet everything is fine. Ive seen tutorials on Youtube on how to properly change an inner tube and yet it is still the same
    My bike tire is 700x35C and so is the inner tube.
    I just dont know what the problem is.
    If anybody could help so i can get this off my shoulder. I am stressing over this because it bugs me that im doing something wrong
    Thanks for anybody that can help!

  2. #2
    Galveston County Texas 10 Wheels's Avatar
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    Some tires and rims combinations.seem to not mesh easily.

    Use a smaller tube like a 25-28
    Last edited by 10 Wheels; 09-30-12 at 09:24 PM.
    [SIZE=1][B]What I like about Texas[/B]
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  3. #3
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    Would the inner tube pop if i just ride it like this?

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    Galveston County Texas 10 Wheels's Avatar
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    Quote Originally Posted by LtGorewrath View Post
    Would the inner tube pop if i just ride it like this?
    It will blow out if the tube is pinched between the tire and rim.
    [SIZE=1][B]What I like about Texas[/B]
    http://www.youtube.com/watch?v=PGukLuXzH1E

    Set F1re To The Ra1n ( NY Night Rain Ride)
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  5. #5
    Galveston County Texas 10 Wheels's Avatar
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    Quote Originally Posted by 10 Wheels View Post
    It will blow out if the tube is pinched between the tire and rim.
    What brand and model is the tire?
    Same with rims?
    [SIZE=1][B]What I like about Texas[/B]
    http://www.youtube.com/watch?v=PGukLuXzH1E

    Set F1re To The Ra1n ( NY Night Rain Ride)
    http://www.youtube.com/watch?v=W7jfcWEkSrI

  6. #6
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    Quote Originally Posted by 10 Wheels View Post
    It will blow out if the tube is pinched between the tire and rim.
    So what i should get another innertube?
    Because my back rim is also the same. Before my front got a flat tire, they were both spinning fine and so when i was changing it today, i thought i would swap the tires so the colors can match. Now that i put the tire, both are like that, they both move up and down

  7. #7
    Can'tre Member 3alarmer's Avatar
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    You are describing what happens when you don't seat the beads properly.

    Deflate the tube all the way down, push up on the valve stem so it goes
    up into the rim hole part way. While it is up there, pay particular attention
    to that area of your tire beads, pulling them down past the stem's joint with
    the tube. Then reinflate slowly, checking every now and then to make sure
    the tire beads are staying evenly seated in the rim flanges around the wheel.

    There are other possibilities, this is the most likely one.
    Quote Originally Posted by Cheshire Cat
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  8. #8
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    Quote Originally Posted by LtGorewrath View Post
    Would the inner tube pop if i just ride it like this?
    Probably.

    Your lump is because of poor seating. The most common cause is trapping tube under the tire when you push the last bit of tire over. Sometimes you can salvage this by inflating to about 10psi and rolling the tire back to free the tube from under the tire.

    You can prevent this by pre-inflating the tube so it stays inside the tire when you install, and finishing at the valve. This has a few advantages, one of which is that you can push the valve up into the tire, pulling the trapped tube out from under the bead.
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    ^ this is great advice. In addition put a little bit or air in your new tube when you start. This helps keep the tube from bunching up and getting caught under the bead. When you finish installing the tire, look all the way around the bead in the rim to be certain any part of the tube isn't caught.
    You're just trying to start an argument to show how smart you are.

  10. #10
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    Quote Originally Posted by FBinNY View Post
    Probably.

    Your lump is because of poor seating. The most common cause is trapping tube under the tire when you push the last bit of tire over. Sometimes you can salvage this by inflating to about 10psi and rolling the tire back to free the tube from under the tire.

    You can prevent this by pre-inflating the tube so it stays inside the tire when you install, and finishing at the valve. This has a few advantages, one of which is that you can push the valve up into the tire, pulling the trapped tube out from under the bead.
    How exactly can i do this?
    I deflate the tube but not all the way just a little bit of air inside and i make sure the tube is in the tire properly and then i put the other half of the tire in and then inflate it but still the same

  11. #11
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    Quote Originally Posted by LtGorewrath View Post
    How exactly can i do this?
    I deflate the tube but not all the way just a little bit of air inside and i make sure the tube is in the tire properly and then i put the other half of the tire in and then inflate it but still the same
    Is the lump, where you last pushed the tire over? (if not sure, mark that area next time). Or is it at the valve?

    Also, what kind or rim do you have? Look at the cross sections here, and tell us which is most like yours. The area of concern is the shape of the tire side, not whether it's aero or not.

    On rims with recessed center wells, (silver ones, third box from left top row) having one part of the tire in the well creates slack allowing another area to be too high. Often you have to seek out low spots and lift them out while spreading the tire around evenly, to pull down high spots.
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  12. #12
    bike whisperer Kimmo's Avatar
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    I always stop pumping up the tyre when it has about 20psi in it, detach the pump. and spin the wheel to check the bead seating (there's almost always a line moulded into the tyre just above the rim for this purpose).

    If it's out, I grab the tyre with both hands and roll it side to side at the trouble spot, or even all the way around for stubborn tyres; the bead tends to pop into place nicely then.

  13. #13
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    First we need to know for sure that the "bumb" is out from the tire rather than in. I don't see anywhere that has been confirmed. There is a "bead line" that you should use for reference when inflating a tire. It's a narrow, raised ridge of rubber that is present on the sidewall of essentially every tire. It sits near the rim when the tire is mounted and inflated, and it should be the same distance from the rim on both sides, all the way around. If there is more space between bead line and rim the tire is out (high spot) if there is less or it disappears the tire is in (low spot)

    If it is out you need to keep track of where that spot is when you deflate the tire. Deflate it until yu can easily push the tire to the side, away from the rim and look into the rim at that spot. YOu should eith4er see a bit of tube sitting underneath the bead (lower edge) of the tirre or if you have arubber rim sxtrip it may be shifted over toward the side of the rim. You can get the tuve underneath the tire by rolling the tire between your thumb and fingers while lifting up on it. The rim strip may be able to be carefully nudged over (no pointy tools!) or you may have to take off the tire and start over.

    If the tire dips down into the rim just spray some Fantastic, 409 or other similar mild cleaner onto both sides of the tire in the area of the dip. Alcohol or talc can also be used. NO WD-40 or other petro based products). Inflate the tire carefully, making sure that there are no high spotw forming as you go. You will have to usually inflate to more than the usual pressure, even 20lbs over. The tire will "pop" when the flat area comes out.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

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    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  14. #14
    bike whisperer Kimmo's Avatar
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    Quote Originally Posted by cny-bikeman View Post
    First we need to know for sure that the "bumb" is out from the tire rather than in.
    Doesn't really affect my advice; haul back and forth on that sucker with a bit of pressure in the tyre, and that sorts it nine times out of ten.

    The other day I had a real tight tyre with a low spot though, and yeah - had to go 20psi over pressure to pop it out.

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