Advertise on Bikeforums.net



User Tag List

Results 1 to 16 of 16
  1. #1
    Member
    Join Date
    Jan 2009
    Posts
    38
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    tyre random going flat??

    hello this may sound really stupid but my tyre is going flate for no reason... i replaced the innertube and it is still going down slowley i check the last inner tube no punchers what so ever pumped it up left for a week and still hasent gone down so could somone tell me what the hell is going on!!

  2. #2
    No lugs? No hugs. Exit.'s Avatar
    Join Date
    Aug 2007
    Location
    Vancouver, Canada
    My Bikes
    '85 Miyata 310, '06 GT Performer
    Posts
    1,115
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Is something holding the valve open?
    1997 Vitali track, 1986 Cilo Swiss road, 2006 KHS Flite 100, 2009 top-secret track bike.

  3. #3
    Yeah. I Race. minichamp31's Avatar
    Join Date
    Jan 2007
    Location
    Northeastern PA
    My Bikes
    Custom Race, 2007 GT Bump, 2007 Gt Powerseries Pro, Dyno VFR
    Posts
    2,888
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Take the tire off and check the liner of the it. Also, check the rim to see if there are any burrs on it.

  4. #4
    Member
    Join Date
    Jan 2009
    Posts
    38
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    hello as i said i have the recent inner tube that i fort kept going flat but it has not so it cant be a puncher or anything im getting really confused at this point!

  5. #5
    Senior Member
    Join Date
    Dec 2008
    Location
    Under the Downunder
    My Bikes
    MTBs, BMX, Pocket MTB
    Posts
    1,014
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Maybe some small piece of grit got stuck on the valve seat when it was on your wheel, but when you took the tube off and pumped it up, the grit got blown off so now the valve is sealed properly.

    Maybe...

  6. #6
    No lugs? No hugs. Exit.'s Avatar
    Join Date
    Aug 2007
    Location
    Vancouver, Canada
    My Bikes
    '85 Miyata 310, '06 GT Performer
    Posts
    1,115
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Pocko View Post
    Maybe some small piece of grit got stuck on the valve seat when it was on your wheel, but when you took the tube off and pumped it up, the grit got blown off so now the valve is sealed properly.

    Maybe...
    That wouldn't explain the new tube still going flat in the wheel.
    1997 Vitali track, 1986 Cilo Swiss road, 2006 KHS Flite 100, 2009 top-secret track bike.

  7. #7
    Senior Member
    Join Date
    Dec 2008
    Location
    Under the Downunder
    My Bikes
    MTBs, BMX, Pocket MTB
    Posts
    1,014
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^ Yeah, you're right. I didn't read the original post properly. I thought the other one is fine and he's just puzzled about the one that's been taken out.

    Hmmm... if he's using the same valve cover, I'd check what's underneath... just in case something is pushing the valve slightly.




    It's a mystery alright... unless his riding mates are pulling a practical joke behind his back.

    .

  8. #8
    Yeah. I Race. minichamp31's Avatar
    Join Date
    Jan 2007
    Location
    Northeastern PA
    My Bikes
    Custom Race, 2007 GT Bump, 2007 Gt Powerseries Pro, Dyno VFR
    Posts
    2,888
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Pocko View Post
    It's a mystery alright... unless his riding mates are pulling a practical joke behind his back.
    Which could be true. Which would also be hilarious.

  9. #9
    Member
    Join Date
    Jan 2009
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Air the tube up and dip it in some water and check for bubbles. If their is bubbles their is something stuck in the tire.

    If not someone is letting air out or your tire has just been sitting their for a while.

    If its not that you may have gotten a faulty tube which is rare.
    http://we-bmx.fairtopic.com heres a forum for freestyle bmx.

  10. #10
    No lugs? No hugs. Exit.'s Avatar
    Join Date
    Aug 2007
    Location
    Vancouver, Canada
    My Bikes
    '85 Miyata 310, '06 GT Performer
    Posts
    1,115
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Pocko View Post
    Hmmm... if he's using the same valve cover, I'd check what's underneath... just in case something is pushing the valve slightly.
    That's the only thing I can think of.
    1997 Vitali track, 1986 Cilo Swiss road, 2006 KHS Flite 100, 2009 top-secret track bike.

  11. #11
    We win all charity rides Street rider's Avatar
    Join Date
    Apr 2008
    Location
    Central Michigan University/ GR, MI
    My Bikes
    BMX, fixed gear
    Posts
    3,381
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by trickin View Post

    If its not that you may have gotten a faulty tube which is rare.
    not all that rare. i once went and bought a few new tubes at once, and stuck out 3 for 3. all of em had holes in em right out of the box. didnt hold the air for five minutes out of the box.

  12. #12
    Member
    Join Date
    Jan 2009
    Posts
    38
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    but this tyre take at least 5 days to go unriderble flat..

  13. #13
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I say do what a couple previous people have said:

    1. check your valve cap for debris, and check that the valve stem is tightened up. Yes I read the op but bear with me.

    2. Check your tube for holes by filling a bucket with water, putting the inflated tube in, and checking for air bubbles. If you inflate the tube while not inside the wheel you wont be able to get close to the types of pressures that most people ride at. This means a leak may only occur whilst installed.

    3. Check the liner in your wheel and make sure it's intact. Check that no spoke-ends are poking out and hitting the tire. Check for junk stuck in the tire itself, basically if there's a sharp part anywhere, it can do damage.

    This is what I feel to be a comprehensive list of what could be causing your problem. If you check all this, and it seems okay then you're being given the runaround by somebody. Good luck.
    Erwin Schroedinger will kill you like a cat in a box. Maybe.

  14. #14
    We win all charity rides Street rider's Avatar
    Join Date
    Apr 2008
    Location
    Central Michigan University/ GR, MI
    My Bikes
    BMX, fixed gear
    Posts
    3,381
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    and if you have multiple tires going flat, like you are, check to see if all (if any) holes are in the same spot. thats when you know that theres something wrong with the rim/rimstrip. otherwise its just faulty tubes

  15. #15
    Senior Member
    Join Date
    Dec 2008
    Location
    Under the Downunder
    My Bikes
    MTBs, BMX, Pocket MTB
    Posts
    1,014
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^ Good call SR.

    That's why I always install my tubes in the same place in relation to the tire (valve next to the tire logo). That way if I do get a puncture, it easy to check roughly where abouts an embedded splinter might be.

    My son's BMX had repeated slow flats which drove him up the wall. Turned out to be a small steel wire embedded diagonally in the tire, just like a splinter. You can't see it by eye but knowing roughly where it should be I was able to "feel" it - then took it out with tweezers and a magnifying glass.

    .

  16. #16
    Yeah. I Race. minichamp31's Avatar
    Join Date
    Jan 2007
    Location
    Northeastern PA
    My Bikes
    Custom Race, 2007 GT Bump, 2007 Gt Powerseries Pro, Dyno VFR
    Posts
    2,888
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I had a thorn on the inside of my tire once. I checked the liner like 3 times and couldn't find anything, and after I went through like 2 or 3 tubes, I checked again and actually found it. That's my interesting story.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •