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Thread: Tires losing 4 PSI per day is normal?

  1. #1

    Tires losing 4 PSI per day is normal?

    Team,

    My 2010 RT with Road 5 tires lose about 1 PSI per day on the front wheel and 4 PSI on the back wheel per day. I check my tires every day but wasn't expecting to have to inflate them every day. These are new tires and have no visible punctures. I'm told by other motorcycle friends and one motorcycle mechanic that "sport tires" will lose air very quickly.

    What gives?

    Thanks,
    Brent

  2. #2
    Back in the saddle again mikegalbicka's Avatar
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    Not normal in my world with any tire.

  3. #3
    Registered User
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    Tires

    Valve Stem?

  4. #4
    Debbie's Servant Lee's Avatar
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    It's not normal.
    Maybe leaking at the valve cores or tire beads.
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  5. #5
    Registered User 36654's Avatar
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    Quote Originally Posted by 179212 View Post
    Valve Stem?
    That would be my choice.......
    Cave contents: 16 R12RS, 13 Toyota Tacoma, 03 Simplicity Legacy, 97 Stihl FS75, Dewalt DW625 & SawStop PCS175
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  6. #6
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Checking your tires every day is/will be tough on the cores in the valve stems. I like a “trigger-sprayer” with a mix of water and dishwashing soap to test with. Watch for “foaming” or a slow lazy bubble.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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  7. #7
    3 Red Bricks
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    Brent,

    Start by removing the valve stem caps and spraying the stems with Windex. Bubbles coming out end = loose or bad valve core. Bubbles coming out around base = bad stem.

    If no bubbles from stem, try spraying around the bead (where the tire meets the rim). If you have bubbles there, someone didn't clean the rim adaquately when the tire was mounted.
    Or
    Some tires have mold "whiskers" that are very close to the bead that under some circumstances, during mounting, can be stretched between the bead and the rim, causing a leak.


    Edit: Damn, I get a phone call in the middle of answering you and four people respond!



    LONG MAY YOUR BRICK FLY!

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    Lee Fulton Forum Moderator
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  8. #8
    Quote Originally Posted by brentseay@gmail.com View Post
    I'm told by other motorcycle friends and one motorcycle mechanic that "sport tires" will lose air very quickly.

    Brent
    They are wrong. Modern tires of any variety do not lose air very quickly if the valve stem and core are sound and the rim is clean when the tire is mounted.

    I find that with PR4 tires on an R1100RS and R1150R I might need to add a pound or two every month.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  9. #9
    Had a valve stem not fully tightened that was discovered to be the culprit of 2-3#'s a day. I'd start there as others have suggested/.
    The lion does not even bother to turn his head when he hears the small dog barking.

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