Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

BMX Dirt, vert, flatland or street? Drop in the BMX forum to talk to other 20" riders around the world. What is the best BMX bicycle for you? Learn all about it here.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 03-07-09, 01:43 PM   #1
tailwhip169
Member
Thread Starter
 
Join Date: Jan 2009
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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!!
tailwhip169 is offline   Reply With Quote
Old 03-07-09, 04:23 PM   #2
Exit.
No lugs? No hugs.
 
Exit.'s Avatar
 
Join Date: Aug 2007
Location: Vancouver, Canada
Bikes: '85 Miyata 310, '06 GT Performer
Posts: 1,115
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is something holding the valve open?
Exit. is offline   Reply With Quote
Old 03-07-09, 06:11 PM   #3
minichamp31
Yeah. I Race.
 
minichamp31's Avatar
 
Join Date: Jan 2007
Location: Northeastern PA
Bikes: Custom Race, 2007 GT Bump, 2007 Gt Powerseries Pro, Dyno VFR
Posts: 2,888
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
minichamp31 is offline   Reply With Quote
Old 03-08-09, 04:10 AM   #4
tailwhip169
Member
Thread Starter
 
Join Date: Jan 2009
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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!
tailwhip169 is offline   Reply With Quote
Old 03-08-09, 04:32 AM   #5
Pocko
Senior Member
 
Join Date: Dec 2008
Location: Under the Downunder
Bikes: MTBs, BMX, Pocket MTB
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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...
Pocko is offline   Reply With Quote
Old 03-08-09, 05:27 AM   #6
Exit.
No lugs? No hugs.
 
Exit.'s Avatar
 
Join Date: Aug 2007
Location: Vancouver, Canada
Bikes: '85 Miyata 310, '06 GT Performer
Posts: 1,115
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Exit. is offline   Reply With Quote
Old 03-08-09, 01:50 PM   #7
Pocko
Senior Member
 
Join Date: Dec 2008
Location: Under the Downunder
Bikes: MTBs, BMX, Pocket MTB
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.

.
Pocko is offline   Reply With Quote
Old 03-08-09, 02:23 PM   #8
minichamp31
Yeah. I Race.
 
minichamp31's Avatar
 
Join Date: Jan 2007
Location: Northeastern PA
Bikes: Custom Race, 2007 GT Bump, 2007 Gt Powerseries Pro, Dyno VFR
Posts: 2,888
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
minichamp31 is offline   Reply With Quote
Old 03-08-09, 03:14 PM   #9
trickin
Member
 
Join Date: Jan 2009
Bikes:
Posts: 33
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
trickin is offline   Reply With Quote
Old 03-08-09, 06:06 PM   #10
Exit.
No lugs? No hugs.
 
Exit.'s Avatar
 
Join Date: Aug 2007
Location: Vancouver, Canada
Bikes: '85 Miyata 310, '06 GT Performer
Posts: 1,115
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Exit. is offline   Reply With Quote
Old 03-08-09, 08:06 PM   #11
Street rider
We win all charity rides
 
Street rider's Avatar
 
Join Date: Apr 2008
Location: Central Michigan University/ GR, MI
Bikes: BMX, fixed gear
Posts: 3,381
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
Street rider is offline   Reply With Quote
Old 03-09-09, 09:44 AM   #12
tailwhip169
Member
Thread Starter
 
Join Date: Jan 2009
Bikes:
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
but this tyre take at least 5 days to go unriderble flat..
tailwhip169 is offline   Reply With Quote
Old 03-09-09, 11:47 AM   #13
pyroguy_3
Senior Member
 
pyroguy_3's Avatar
 
Join Date: Oct 2005
Location: Blo-no, IL
Bikes: 2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
Posts: 556
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
pyroguy_3 is offline   Reply With Quote
Old 03-09-09, 01:21 PM   #14
Street rider
We win all charity rides
 
Street rider's Avatar
 
Join Date: Apr 2008
Location: Central Michigan University/ GR, MI
Bikes: BMX, fixed gear
Posts: 3,381
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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
Street rider is offline   Reply With Quote
Old 03-09-09, 01:40 PM   #15
Pocko
Senior Member
 
Join Date: Dec 2008
Location: Under the Downunder
Bikes: MTBs, BMX, Pocket MTB
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.

.
Pocko is offline   Reply With Quote
Old 03-09-09, 04:43 PM   #16
minichamp31
Yeah. I Race.
 
minichamp31's Avatar
 
Join Date: Jan 2007
Location: Northeastern PA
Bikes: Custom Race, 2007 GT Bump, 2007 Gt Powerseries Pro, Dyno VFR
Posts: 2,888
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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.
minichamp31 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:09 PM.