Advertise on Bikeforums.net



User Tag List

Results 1 to 17 of 17
  1. #1
    Senior Member
    Join Date
    Jul 2005
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    TIRE has an egg!

    Just replaced a tube in my rear tire with a new tube. The rim is essentially perfectly true.

    The tube was well centered in the tire. I blew it up a little, and set it in the tire and made sure it was uniform all around with no redundant regions. I made sure the beads were set. Kept blowing it up a little bit at a time and rechecking everything. When I blew it up all the way it has a pretty good egg. Maybe 7-8 mm.

    What gives?

    Is there such a thing as tire fatigue?

  2. #2
    Senior Member
    Join Date
    Sep 2004
    Location
    boston, ma
    Posts
    2,780
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    sounds like the cords/belt are breaking inside the tire. had a tire fail with busted cords while headed to work, called work for a pick up

  3. #3
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    12,356
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Casing failure, replace ASAP.

    If you must ride on it, reduce the pressure to the point where the rim is still supported off the pavement and carefully ride to your LBS and buy a new tire.

  4. #4
    Senior Member
    Join Date
    Dec 2010
    Location
    northern Deep South
    My Bikes
    Fuji Touring, Novara Randonee
    Posts
    1,760
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm afraid you broke some casing threads while replacing the tube. Did you perhaps use a screwdriver to pry the tire off the rim?

    Theoretically, it might be possible to glue a boot in, but as a practical matter, the tire must be replaced.

  5. #5
    Senior Member Bill Kapaun's Avatar
    Join Date
    Feb 2007
    Location
    Mid Willamette Valley, Orygun
    My Bikes
    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
    Posts
    6,810
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    What's a "redundant region"?????

  6. #6
    Kitten Legion Master
    Join Date
    May 2010
    Location
    Portland, Oregon
    My Bikes
    Fuji silhouette, Dawes SST-aL
    Posts
    876
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    photo?

  7. #7
    Senior Member
    Join Date
    Jul 2005
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A static photo wouldn't help.

    After putting the tire back on, with the bike on the repair stand, and getting it spinning, you can see it's not round. No side-to-side wobble but up and down.

    Redundant meaning the tube was not stretched in any part of the circumference and lax in another part of the circumference.

  8. #8
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,663
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Raleigh71 View Post
    A static photo wouldn't help.

    After putting the tire back on, with the bike on the repair stand, and getting it spinning, you can see it's not round. No side-to-side wobble but up and down.

    Redundant meaning the tube was not stretched in any part of the circumference and lax in another part of the circumference.
    If the bead is even all the way around the rim (there's a molded-in line on the tire that will show this) and the top of the tire is bulging... yep, the tire casing is failing. Replace it before it goes boom.
    Jeff Wills

    All my bikes.

  9. #9
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,004
    Mentioned
    32 Post(s)
    Tagged
    1 Thread(s)
    OK, as the others have said an "egg" or well defined bulge in the wire means the cords are broken, or separating allowing one area to be stretched by the pressure.

    However, if you have a radial high spot, and it's over a section of more than 4 or 5 inches, it's more likely a seating problem. As jeff Wills said, there are molded lines along the bead of the tire. Find the one nearest the rim and see that it stays the same distance from the rim's lip when the wheel is spun slowly. Check both sides. If the lip changes distance, especially if it moves out the same place as your egg, than it's simply a case of poor seating, which most commonly happens ear the valve.

    If the bead indicator line is concentric, and the tire bulges than the tire is truly shot.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  10. #10
    Senior Member
    Join Date
    Dec 2010
    Location
    Above ground, Walnut Creek, Ca
    My Bikes
    7 single speed road
    Posts
    3,656
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    i suppose the first thing i would do would be to put the front tire on the back and take a look. if I still had an "egg" i'd look at the rim, if i didn't have an "egg" i'd throw away that old rear tire and buy a new one most likely.

  11. #11
    Junior Member
    Join Date
    Sep 2011
    Location
    Long Island, NY
    My Bikes
    Specialized
    Posts
    8
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I hear the garbage can calling

  12. #12
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,615
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How was the tire before you had the flat?

    Before running out to buy a new tire, try this:
    1. Deflate your tire to about 10 psi.
    2. Push straight in on the valve stem.
    3. Reinflate the tire to operating pressure and see what happens.

    The area of the tube around the valve stem is thicker than the rest of the tube. That thick area can get caught under the tire bead and lift that portion of the tire up a skosh.

  13. #13
    Senior Member
    Join Date
    Jul 2005
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The moulded line is pretty straight all around on both sides of the tire.

    The area around the valve is OK too.

    It's actually up and down in several places around the tire, not just a single egg.

    I think the problem is as follows:

    This is a Panarcer Pacella 700 x 35 mm tire that is listed on the tire itself as having a max pressure of 90 PSI.

    The specs on the Nashbar website list it as having a max pressure of 75 PSI.

    I've been running it at 85 PSI that is probably too high, and it's stretched out.

    I carefully inspected it and don't see any broken nylon strands on the inside but do see some cracking in the rubber on the outside.

    The front tire is the OEM 1990's Heng Shin that is also starting to crack.

    Time for new pair of tires I guess. I was thinking Vittoria Randonneur Road Tire but they're a little pricey.

    Any suggestions or comments?

    Thanks for the input!

  14. #14
    Senior Member
    Join Date
    Jul 2005
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Retro Grouch View Post
    How was the tire before you had the flat?

    Before running out to buy a new tire, try this:
    1. Deflate your tire to about 10 psi.
    2. Push straight in on the valve stem.
    3. Reinflate the tire to operating pressure and see what happens.

    The area of the tube around the valve stem is thicker than the rest of the tube. That thick area can get caught under the tire bead and lift that portion of the tire up a skosh.
    Actually I replaced the tire on a new wheel. The old wheel was so far out of true that the tire issue was masked.

  15. #15
    I STILL miss East Hill :) Rollfast's Avatar
    Join Date
    Jun 2007
    Location
    Where my bike's at
    My Bikes
    a lot
    Posts
    2,583
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I had a horrid bulge last year on my Schwinn Cruiser SS.

    Oddly enough is was a brand new 26x2.125 whitewall with wonderful knobs. I sorta know but sorta don't know!
    Quote Originally Posted by 10 Wheels
    They can't fix expansion joints, because they expand.
    Smile at Miles with a ROLLFAST!

  16. #16
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,663
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Raleigh71 View Post
    The moulded line is pretty straight all around on both sides of the tire.

    The area around the valve is OK too.

    It's actually up and down in several places around the tire, not just a single egg.

    I think the problem is as follows:

    This is a Panaracer Pasela 700 x 35 mm tire that is listed on the tire itself as having a max pressure of 90 PSI.

    The specs on the Nashbar website list it as having a max pressure of 75 PSI.

    I've been running it at 85 PSI that is probably too high, and it's stretched out.

    I carefully inspected it and don't see any broken nylon strands on the inside but do see some cracking in the rubber on the outside.

    The front tire is the OEM 1990's Cheng Shin that is also starting to crack.

    Time for new pair of tires I guess. I was thinking Vittoria Randonneur Road Tire but they're a little pricey.

    Any suggestions or comments?

    Thanks for the input!
    10psi over the nominal rating shouldn't create the problem you describe. I routinely run my 90psi tires at 110psi without issues or undue wear. I think you got a defective tire there.

    The Vittoria Randonneur 700 x 32 or 700 x 35 would be a good, tough tire: http://www.biketiresdirect.com/produ...andonneur-tire . It's going to be somewhat heavier than the Pasela, though.
    Jeff Wills

    All my bikes.

  17. #17
    Senior Member
    Join Date
    Jul 2005
    Posts
    280
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    After consideration I decided to go for the Nashbar brand 700c X 35 mm 'comfort' tire:

    http://www.nashbar.com/bikes/Product..._202642_10000_

    I won't be using it on my next Tour de France but given the bike it's on I thought it was an appropriate compromise.

Posting Permissions

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