Advertise on Bikeforums.net



User Tag List

Results 1 to 23 of 23
  1. #1
    Around now and then DnvrFox's Avatar
    Join Date
    Aug 2001
    Location
    Around now and then
    Posts
    20,785
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    I Finally Figured it Out!

    I Finally Figured it Out!

    That intermittent leak in my rear tire was driving me nuts!

    Sometimes it would stay full for days, this morning after topping it off it was down in 2 miles.

    In the process of trying to discover the cause, I have:

    1. Removed the tube and turned the tire inside out, checking for anythning, feeling inside, using a kleenex, etc.

    2. Placed the tube, as full as I could get it, in water - no leak.

    3. Placed the pressurized tire on the wheel in a water trough, and turning it slowly, including the valve covered by water - no leak.

    I figured it might be an intermittent high pressure leak in the Goop-filled tube, sealing, leaking and resealing. If so, I didn't want to put another tube in without knowing the cause of the leak in the tire.

    Ah ha!

    This morning, after going out 2 miles and then returning with a very low tire, I messed around a bit with the presta valve. I finally discovered that it was intermittently not seating properly, and I had not been rigorous about really tightening the valve stem screw.

    So, I pumped her up one more time, really tightened down the presta valve, and, lo and behold, it held just fine.

    As this is a pretty expensive tube, and I think I know the cause, I will not replace the tube at this time. If it continues to lose air, even after tightening the valve, I will.

    At least it is not some devious thorn in the tire!

    Anyone else have strange, unexplainable flats?
    Last edited by DnvrFox; 08-16-07 at 09:24 AM.
    DnvrFox - still bicycling, swimming, walking and weight lifting at 74yo is participating a bit in BFN 50+.

  2. #2
    Senior Member
    Join Date
    Feb 2007
    Location
    S.E. Pennsylvania, USA
    Posts
    1,737
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's the little victories that can really brighten up a day sometimes. I had a similar experience last summer. Same thing, valve not closing all the way. It drove me nuts for two weeks. I felt like I was being defeated by a stupid bit of rubber, and was not about to let that happen. The glorious feeling of triumph upon finding the cause was quite nice.
    Oh I used to be disgusted and now I try to be amused. But since their wings have got rusted, you know, the angels wanna wear my red shoes. But when they told me 'bout their side of the bargain, that's when I knew that I could not refuse. And I won't get any older, now the angels wanna wear my red shoes.

  3. #3
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,151
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    No...but suggest replacing the tube. Flats and blowouts are always safety issues. The leak is slow...so far.
    "Insanity: doing the same thing over and over again and expecting different results." Einstein

  4. #4
    Ride Daddy Ride Jet Travis's Avatar
    Join Date
    Feb 2007
    Location
    Villa Incognito
    My Bikes
    1983 Trek 720; 1983 Trek 620; 1989 Gi Cannondale Bad Boy Ultra; LeMond Victoire; Bike Friday Pocket Rocket Pro
    Posts
    2,648
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Hermes View Post
    No...but suggest replacing the tube. Flats and blowouts are always safety issues. The leak is slow...so far.
    +1
    "Light it up, Popo." --Levi Leipheimer

  5. #5
    Pedaled too far. Artkansas's Avatar
    Join Date
    Oct 2005
    Location
    La Petite Roche
    Posts
    12,191
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by DnvrFox View Post
    This morning, after going out 2 miles and then returning with a very low tire, I messed around a bit with the presta valve. I finally discovered that it was intermittently not seating properly, and I had not been rigorous about really tightening the valve stem screw.

    So, I pumped her up one more time, really tightened down the presta valve, and, lo and behold, it held just fine.

    Anyone else have strange, unexplainable flats?
    I did several years ago, and it turned out to be the same thing, only in a Schrader valve. The valve was loose.

  6. #6
    Small Member maddmaxx's Avatar
    Join Date
    Nov 2003
    My Bikes
    Leader home built hardtail, Diamondback Response
    Posts
    7,071
    Mentioned
    4 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by DnvrFox View Post
    I Finally Figured it Out!

    That intermittent leak in my rear tire was driving me nuts!

    Sometimes it would stay full for days, this morning after topping it off it was down in 2 miles.

    In the process of trying to discover the cause, I have:

    1. Removed the tube and turned the tire inside out, checking for anythning, feeling inside, using a kleenex, etc.

    2. Placed the tube, as full as I could get it, in water - no leak.

    3. Placed the pressurized tire on the wheel in a water trough, and turning it slowly, including the valve covered by water - no leak.

    I figured it might be an intermittent high pressure leak in the Goop-filled tube, sealing, leaking and resealing. If so, I didn't want to put another tube in without knowing the cause of the leak in the tire.

    Ah ha!

    This morning, after going out 2 miles and then returning with a very low tire, I messed around a bit with the presta valve. I finally discovered that it was intermittently not seating properly, and I had not been rigorous about really tightening the valve stem screw.

    So, I pumped her up one more time, really tightened down the presta valve, and, lo and behold, it held just fine.

    As this is a pretty expensive tube, and I think I know the cause, I will not replace the tube at this time. If it continues to lose air, even after tightening the valve, I will.

    At least it is not some devious thorn in the tire!

    Anyone else have strange, unexplainable flats?
    I have had exactly this same problem. It would seem to be more common than assumed. I know that a presta valve that is not screwed in will vibrate and leak air in small bursts.

  7. #7
    Ride Daddy Ride Jet Travis's Avatar
    Join Date
    Feb 2007
    Location
    Villa Incognito
    My Bikes
    1983 Trek 720; 1983 Trek 620; 1989 Gi Cannondale Bad Boy Ultra; LeMond Victoire; Bike Friday Pocket Rocket Pro
    Posts
    2,648
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by maddmaxx View Post
    I know that a presta valve that is not screwed in will vibrate and leak air in small bursts.

    My head isn't screwed on straight, and the same thing happens to me all the time.
    "Light it up, Popo." --Levi Leipheimer

  8. #8
    Senior Member
    Join Date
    Jul 2005
    Posts
    3,190
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    This is why I only go with schrader valves. When I bought new wheels, I drilled them out as soon as they arrived. Prestas are just landfill in disguise. bk

  9. #9
    Wheezing Geezer Bud Bent's Avatar
    Join Date
    Dec 2004
    Location
    Crowley, Tx
    My Bikes
    Bacchetta Corsa, RANS Stratus XP
    Posts
    1,782
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have a tube on one of my bike's that doing the same thing right now. It's made me more conscious of making sure to tighten the valve well on all my presta tubes.
    Bud
    * 2009 RANS XStream
    * 2007 RANS Stratus XP
    * 2006 Bacchetta Corsa
    My Blog - uneasy-rider.com

    They told me it's ok to post mileage over in the commuting forum, so you'll probably find me there these days.

  10. #10
    I need more cowbell. Digital Gee's Avatar
    Join Date
    Jun 2005
    Location
    Reno, Nevada
    My Bikes
    2012 Masi Evoluzione, 2009 Specialized Globe Vienna 2
    Posts
    7,893
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jet Travis View Post
    My head isn't screwed on straight, and the same thing happens to me all the time.
    We all knew that, but no one wanted to say it out loud.
    Visit my blog! The Leadership Almanac
    2012 Masi Evoluzione
    2009 Specialized Globe Vienna 2

    Proud member of the original Club Tombay

  11. #11
    Huachuca Rider webist's Avatar
    Join Date
    Jun 2002
    Location
    Charlotte, NC
    My Bikes
    Fuji CCR1, Specialized Roubaix
    Posts
    4,274
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Good reminder. Thanks.
    Just Peddlin' Around

  12. #12
    Live To Ride Another Day! MarkAJ's Avatar
    Join Date
    Aug 2006
    Location
    Burbank, CA
    My Bikes
    Pig with lipstick (Trek Pilot 2.1 Ulterga Group/Compact Crank)
    Posts
    303
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Do any of you use Presta value caps? I always have and never have experienced this problem. I am thinking I have to tighten the value down to get the cap on and maybe this is why I don’t see this problem.
    I'm pushing it "High and Wide".
    -Mark

  13. #13
    The Grampster tlc20010's Avatar
    Join Date
    Sep 2005
    Location
    Washington, DC
    My Bikes
    Eddy Merckx SXM, LeMond Buenos Aires, Cannondale Road Warrior 1000 plus a couple of comforts (Specialized Crossroads and Giant Cyprus) and a beater mtb for around town.
    Posts
    657
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by bkaapcke View Post
    This is why I only go with schrader valves. When I bought new wheels, I drilled them out as soon as they arrived. Prestas are just landfill in disguise. bk
    Do you actually believe that or is just another curmudgeonly remark? While it is possible to find schrader tubes for road bikes, they are very few and very far between. I think Forte makes a 700x23-28 or some such thing.
    The definition of insanity is doing the same thing over and over and expecting different results.
    --Ben Franklin

  14. #14
    Ride Daddy Ride Jet Travis's Avatar
    Join Date
    Feb 2007
    Location
    Villa Incognito
    My Bikes
    1983 Trek 720; 1983 Trek 620; 1989 Gi Cannondale Bad Boy Ultra; LeMond Victoire; Bike Friday Pocket Rocket Pro
    Posts
    2,648
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Digital Gee View Post
    We all knew that, but no one wanted to say it out loud.
    pfft.
    "Light it up, Popo." --Levi Leipheimer

  15. #15
    Senior Member Terrierman's Avatar
    Join Date
    Oct 2006
    Location
    SWMO
    Posts
    3,132
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jet Travis View Post
    My head isn't screwed on straight, and the same thing happens to me all the time.
    Good reminder. Thanks.
    It's all downhill from here. Except the parts that are uphill.

  16. #16
    Dharma Dog lhbernhardt's Avatar
    Join Date
    Mar 2006
    Location
    Vancouver, Canada
    My Bikes
    Rodriguez Shiftless street fixie with S&S couplers, Kuwahara tandem, Trek carbon, Dolan track
    Posts
    2,044
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by bkaapcke View Post
    This is why I only go with schrader valves. When I bought new wheels, I drilled them out as soon as they arrived. Prestas are just landfill in disguise. bk
    I've always thought Schraeder valves were for beginners who didn't want to buy the floor pump and only went for rides on weekends and aired their tires at the gas station. When I first started riding back in the 70's, serious riders used presta valves. They are just so much easier to pressurize with a frame pump.

    You can make Schraeder tubes easier to pump, but you have to take the valve apart, cut the spring in half, and reassemble it.

    At the bike room at work where I keep my bike during the day, I brought in an old Silca floor pump with a presta chuck for use in case I puncture on the way to work, so I can leave work with the tire fully aired. I'm sure I've pissed lots of riders off because most of the bikes in the room have Schraeder valves, and I know guys have tried to pump up these tubes with my floor pump! Har, har...

    - L.

  17. #17
    Senior Member zonatandem's Avatar
    Join Date
    Dec 2003
    Location
    Tucson, AZ
    My Bikes
    ariZona carbon fiber tandem & single
    Posts
    9,940
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    We always put the little caps on our closed presta valve. That's what they're for.

  18. #18
    Violin guitar mandolin
    Join Date
    Sep 2005
    Location
    Friendsville, TN, USA
    My Bikes
    Wilier Thor, Fuji Professional, LeMond Wayzata
    Posts
    1,171
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I would think the caps would be a good thing for protection. I used to leave them off when I rode tubulars. If the tire rolls, the cap keeps it from rolling completely. That's bad - locks up right away instead of allowing the rim to roll a bit so control can be had. Never happened to me, but that's the story anyway!

  19. #19
    Lincoln, CA Mojo Slim's Avatar
    Join Date
    Sep 2004
    Location
    Lincoln, CA
    My Bikes
    94 Giant ATX 760, 2001 Biachi Eros, 2005 Giant OCR2 Composite +
    Posts
    2,229
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Those little caps add alotta weight, don't they?
    Truth is stranger than reality.
    '96 Giant ATX 760 MTB
    '01 Bianchi Eros
    '05 Giant OCR Llimited Carbon Fiber + upgrades

  20. #20
    SSP
    SSP is offline
    Software for Cyclists SSP's Avatar
    Join Date
    Dec 2003
    Location
    Redding, California
    My Bikes
    Trek 5200, Specialized MTB
    Posts
    4,618
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You ride in the Rockies and use heavy Goop-filled tubes???

    Having completed 5 week-long tours in Colorado, crossed the Continental Divide 10 times, and ridden to the top of Mt. Evans...I can't imagine dragging all that excess rolling weight up and down those mountains.

    FWIW, it's possible the Goop itself caused your problems, by getting into the valve mechanism and preventing it from closing completely.
    CycliStats.com - Software for Cyclists
    WeightWare.com - Weight Management Software

  21. #21
    Around now and then DnvrFox's Avatar
    Join Date
    Aug 2001
    Location
    Around now and then
    Posts
    20,785
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by SSP View Post
    You ride in the Rockies and use heavy Goop-filled tubes???

    Having completed 5 week-long tours in Colorado, crossed the Continental Divide 10 times, and ridden to the top of Mt. Evans...I can't imagine dragging all that excess rolling weight up and down those mountains.

    FWIW, it's possible the Goop itself caused your problems, by getting into the valve mechanism and preventing it from closing completely.
    I ride where there are oodles and oodles of goatheads (puncture vine). They blow onto the trails and streets. I have had up to 7 at one blow. I do very little "Riding in the Rockies" at this time, mostly I ride on the areas around my home.

    I am aware of what the Goop causes and does not cause. I will take my chances with the Goop for less flat tires.

    And I am very impressed by your accomplishments!
    DnvrFox - still bicycling, swimming, walking and weight lifting at 74yo is participating a bit in BFN 50+.

  22. #22
    SSP
    SSP is offline
    Software for Cyclists SSP's Avatar
    Join Date
    Dec 2003
    Location
    Redding, California
    My Bikes
    Trek 5200, Specialized MTB
    Posts
    4,618
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by DnvrFox View Post
    I ride where there are oodles and oodles of goatheads (puncture vine). They blow onto the trails and streets. I have had up to 7 at one blow. I do very little "Riding in the Rockies" at this time, mostly I ride on the areas around my home.

    I am aware of what the Goop causes and does not cause. I will take my chances with the Goop for less flat tires.

    And I am very impressed by your accomplishments!
    Hmmmm...maybe the puncture vine is only in the lowlands. I don't recall having problems with it on my tours (though I do try and lift the bike when walking across unpaved areas).

    I really like the riding I've done in Colorado, and I'm even considering moving there someday. I'd like to move to Broomfield, or maybe Colorado Springs (though it may have too many whacky fundamentalists to be a viable place to live).
    CycliStats.com - Software for Cyclists
    WeightWare.com - Weight Management Software

  23. #23
    Around now and then DnvrFox's Avatar
    Join Date
    Aug 2001
    Location
    Around now and then
    Posts
    20,785
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by SSP View Post
    Hmmmm...maybe the puncture vine is only in the lowlands. I don't recall having problems with it on my tours (though I do try and lift the bike when walking across unpaved areas).
    Yes, it is a "lowlands" (we are at 6,000 ft) phenomenon. It is very prevalent ON cement trails. You would have to carry your bike continuously.

    Last edited by DnvrFox; 08-17-07 at 03:05 PM.
    DnvrFox - still bicycling, swimming, walking and weight lifting at 74yo is participating a bit in BFN 50+.

Posting Permissions

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