Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Senior Member
    Join Date
    Jul 2009
    Posts
    206
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    28c tubes in 25c tires?

    Due to a spate of flats in the past few months, I came to the conclusion that the stock Kendas on my Torker U District were due to be replaced. The sales person at the bike shop/a bit of internet research on these boards guided me to some Conti Gatorskins. Wanting to have a bit more fun but keep a semi-wide tire for comfort as this is my only bike and I use it for not only commuting but also longer rides on the weekend (40+ miles) I opted for 25c.

    When I got home and started changing the tires I happened to see that my tubes are for 28-32c tires. I successfully mounted and inflated everything, but should the tube/tire mismatch cause me concern? Like can I ride to work tomorrow and pick up smaller tubes on the way home, or should I stay off the bike til I have the appropriate tubes?


    TLDR: 28c tubes in 25c tires, cause for concern?

  2. #2
    Senior Member
    Join Date
    Apr 2010
    Posts
    63
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    IMO if you managed to mount the tires w/o pinching the tubes under the tire beads and the tires are properly seated, I wouldn't worry about it.

  3. #3
    Senior Member
    Join Date
    Jul 2009
    Posts
    206
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It was a pain to get the tube completely under the bead near the valve, so I'm a bit worried about the "pinching the tubes" bit but I'm thinking 115lbs of air pressure would have blown the tube had that been the case?

  4. #4
    Don't Worry..Beef Curry
    Join Date
    Jan 2009
    Location
    San Francisco
    My Bikes
    80's converted Centurion
    Posts
    109
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by John10568 View Post
    IMO if you managed to mount the tires w/o pinching the tubes under the tire beads and the tires are properly seated, I wouldn't worry about it.
    ditto

  5. #5
    Senior Member
    Join Date
    Jan 2010
    Posts
    119
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I ride with 700x28c tires with 35c-45c tubes. Doesn't seem to pinch and they come cheap. $4 at wal mart and I live pretty darn close.

    Works well too. Last me months, until today when I rode my bike on a rocky trail...lol..=\

  6. #6
    mogul
    Join Date
    May 2009
    Location
    San Diego
    Posts
    131
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    you better be careful,your tires might explode.

  7. #7
    Goon
    Join Date
    Jul 2008
    Location
    Ypsilanti, MI
    My Bikes
    Rocky Mountain RC30, Soma Sport Fixed
    Posts
    864
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by toosense View Post
    you better be careful,your tires might explode.
    violently
    No matter how bad things get, they can't get any better, and they can't get any worse, things are what they are, so you better get used to it Nancy, quit your B*tchin'

    -Church

  8. #8
    Senior Member MrCjolsen's Avatar
    Join Date
    Nov 2004
    Location
    Davis CA
    My Bikes
    Surly Cross-Check, '85 Giant road bike (unrecogizable fixed-gear conversion
    Posts
    3,954
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Actually, you may have a slight measure of flat protection. When a 28c tire is mounted inside a 25c tire, there is very little stretching of the rubber. Therefore, it's possible that somethings that may get past the tire, may not actually puncture the tube. This actually did happen to me once.

  9. #9
    Goon
    Join Date
    Jul 2008
    Location
    Ypsilanti, MI
    My Bikes
    Rocky Mountain RC30, Soma Sport Fixed
    Posts
    864
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MrCjolsen View Post
    Actually, you may have a slight measure of flat protection. When a 28c tire is mounted inside a 25c tire, there is very little stretching of the rubber. Therefore, it's possible that somethings that may get past the tire, may not actually puncture the tube. This actually did happen to me once.
    I have heard that there can be flat problems putting a larger tube into the tire, but I can't figure out why, other than maybe it tends to cause heat/friction problems, or some such.
    No matter how bad things get, they can't get any better, and they can't get any worse, things are what they are, so you better get used to it Nancy, quit your B*tchin'

    -Church

  10. #10
    Comanche Racing PedallingATX's Avatar
    Join Date
    Feb 2009
    Location
    Deep in the heart of Texas
    My Bikes
    Presto NJS build, Specialized Allez Pro w/ full Dura Ace and Ksyrium SLs, 1990something Specialized Sirrus
    Posts
    2,822
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    it's fine.
    skinnytire

Posting Permissions

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