Recommended tire pressure

Discussion in 'Touring Models' started by JKT1969, Nov 24, 2009.

  1. JKT1969

    JKT1969 Active Member

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    Temps are dropping quickly. I checked my tire pressures and they were a little low, so I put 1lb less than what was listed on the sidewalls. Seems to ride better....but, what is the best tire pressure for my 09 Street Glide?

    Happy Thanksgiving.
     
  2. walleye

    walleye Junior Member Contributor

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    jkt69, First of all, you are being smart checking your tires regularly, especially in the cooler temps as they will lose some pressure as a result. Here you go.
    Tire Inflation 1 - Harley Davidson Community

    Glider, are you proud of my search talent?
     
  3. R. Lewis

    R. Lewis Senior Member Retired Moderators

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    Just remember -- the PSI on the sidewalls are MAX pressures!!!!!
     
  4. Hoople

    Hoople Account Removed

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    Is that when the tires are inflated Cold. Or is that the max pressure under any circumstance (Hot)?

    I am guessing that is the Max pressure when cold but I don't really know.
     
  5. Davidw2415

    Davidw2415 Senior Member

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    Maximum pressure isn't necessarily the recomened pressure. It's best to check your owners manual.
     
  6. NEWHD74FAN

    NEWHD74FAN Experienced Member Retired Moderators

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    JKT...very good that you took the time to check. Yes, seasonal check is a good call, a better one would at least monthly (preferably bi-monthly)...:D...as well as a simple visual check every time you ride as a minimum. Use the HD manufacturer's decal on the frame as a reference especially if you are using the stock Dunlop tires and wheels originally equipped cold. :s

    The sidewall imprint only specifies the "absolute" max. cold pressure value, which is likely 10 PSI or more OVERINFLATED if compared to the actual HD factory manufacturer recommendation. :small3d002:
     
  7. Dr. Dolittle

    Dr. Dolittle Experienced Member Staff Member Moderator Contributor

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    BINGO! Owner's manual will tell you the recommended pressure and takes precedence over the max pressure stamped on the sidewall.
     
  8. Hoople

    Hoople Account Removed

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    Well that makes sense to me. "absolute Max Cold Tire pressure".

    But now I ask this:

    This has been a long time puzzle for me since I use nitrogen...
    I do know the user manual states the tire pressures when cold, in my case are: 30 front/ 36 rear (1 up). And 30 Front 40 Rear (2 up)
    I do know a 30 front /36 rear when cold will yield 34 Front & 41 rear when Hot.
    Does that mean Harley really wants the tires to run at 34 & 41 when hot? If so, would I then add extra PSI into the tires if using nitrogen because nitrogen has a lower coefficient of expansion?

    Since I use nitrogen, I have no clue what my tire pressures should be.
    Any ideas?
     
  9. Hoople

    Hoople Account Removed

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    How can you say the owners manual takes precedence over the Tire Manufacturer? I would believe the Tire manufacturer over the Bike manufacturer.
    Remember when the Shuttle manufacturer said they were right over the "O"ring manufacturer?
     
  10. Dr. Dolittle

    Dr. Dolittle Experienced Member Staff Member Moderator Contributor

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    Obviously I wasn't very clear. I meant the owner's manual should take precedence in setting the target running pressures of the tires over the max pressures the tire manufacturer is required by law to put on the sidewalls. The sidewall numbers are not target numbers, they are a maximum. I'm fairly certain the owner's manual numbers are arrived at in conjunction with the tire companies that make the tires that come stock on the bikes, they aren't invented in a vacuum.