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Thread: F750GS (/F850GS) low tire pressure indicator?

  1. #1

    F750GS (/F850GS) low tire pressure indicator?

    After riding for 10 minutes, I did not see a low pressure warning, but tire pressure was 10lbs low when I finally navigated to the correct screen.

    If you are riding down the street and get a slow puncture, its supposed to let you know. I can't figure out why mine didn't warn me.

    Is there some setting?
    Sam Halperin
    Long Beach Island, New Jersey, USA
    sam@samhalperin.com
    "Sit and know you are sitting." -- Joseph Goldstein

  2. #2
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Maybe one of those “pictographic” screen symbols? There may be an explanation of what you were supposed to see? I would expect to see the warning on the main screen.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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    2009 F800GS 1994 TW200

  3. #3
    I'm going to do a little experiment and see if I can catch it in the act. When it's nicer out I'll set the tire pressure to 10lbs under and ride around a bit locally on slower roads. I'd like to see that the tire pressure reading does show the correct (or temperature adjusted per the manual) reading, and that the automatic warning goes off. I'll see if I can catch it on camera misbehaving. 10lbs under isn't going to kill me, esp. at 35 mph.
    Sam Halperin
    Long Beach Island, New Jersey, USA
    sam@samhalperin.com
    "Sit and know you are sitting." -- Joseph Goldstein

  4. #4
    #13338 PGlaves's Avatar
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    Quote Originally Posted by shalperin View Post
    I'm going to do a little experiment and see if I can catch it in the act. When it's nicer out I'll set the tire pressure to 10lbs under and ride around a bit locally on slower roads. I'd like to see that the tire pressure reading does show the correct (or temperature adjusted per the manual) reading, and that the automatic warning goes off. I'll see if I can catch it on camera misbehaving. 10lbs under isn't going to kill me, esp. at 35 mph.
    With all respect due, my $50 aftermarket TPMS beeps and flashes quite annoyingly if the pressure gets 10% (not 10 p.s.i.) low.
    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/

  5. #5
    So the $14,000 dollar one that came with a free motorcycle should work all the better.
    Sam Halperin
    Long Beach Island, New Jersey, USA
    sam@samhalperin.com
    "Sit and know you are sitting." -- Joseph Goldstein

  6. #6
    #13338 PGlaves's Avatar
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    Quote Originally Posted by shalperin View Post
    So the $14,000 dollar one that came with a free motorcycle should work all the better.
    Yep! It should be flawless at that price.
    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/

  7. #7
    I don't know what the threshold is, but the one time I got a really bad puncture the light came on in the time it took me to pull over. I heard the puncture and knew what happened and immediately started slowing to pull over, so maybe 10s to flat and 5s for the light to come on yellow (warning, pressure low) and then another second to red (pull over before you die). The other time it was a slow leak when I parked the bike. When I started up and tried to ride away the warning light came on immediately once the sensors initialized. I didn't even make it out of the parking lot and the pressure was reading about 15psi.

  8. #8
    Registered User Guenther's Avatar
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    There is some information about the tire pressure warnings in the F750GS Owner's Manual chapter STATUS INDICATORS.

    On my F700GS it looks about the same as for the F750GS. If the tire pressure is close to the permissible tolerance range, the triangle general warning light comes on showing yellow. If the tire pressure is outside the permissible tolerance the warning light flashes red.

    Unfortunately the Owner's Manual does not state what the psi ranges are for permissible and outside permissible.

    It happened to me when riding one day I picked up a tiny nail. When the yellow light came on I changed the display to show the readings from the TPM: 30:32, so ~30 PSI front, ~32 rear. Twenty minutes the light was flashing red and the TPM showed ~30:~25. I don't remember the exact numbers.

    Did you get the 10lbs low from the display or by using a manual tire pressure gauge?

    Keep in mind that the tire pressure shown by a manual tire pressure gauge only matches the tire pressure of the TPM when at sea level and at 20 degrees Celsius. But that is a totally different story.
    2017 F700GS - I wish she had a drive shaft

  9. #9
    SURVIVOR akbeemer's Avatar
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    Quote Originally Posted by PGlaves View Post
    With all respect due, my $50 aftermarket TPMS beeps and flashes quite annoyingly if the pressure gets 10% (not 10 p.s.i.) low.
    What is your system called, please?
    Kevin Huddy
    Silver City, Montana
    MOA# 24,790 Ambassador

  10. #10
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by Guenther View Post

    Unfortunately the Owner's Manual does not state what the psi ranges are for permissible and outside permissible.

    .
    My bike and car manuals also do not show that figure.
    We've had TPM in our cars since 2008 that show the tire pressure figure and on our bikes since 2011 and have never seen a low pressure warning.
    I have no idea at what tire pressure a warning is displayed.
    Lee
    2022 R1250RS
    MOA # 30878
    Past BMW Bikes: 2016 R1200RS, 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  11. #11
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by Guenther View Post

    Did you get the 10lbs low from the display or by using a manual tire pressure gauge?

    .
    The OP said he checked the display.
    Lee
    2022 R1250RS
    MOA # 30878
    Past BMW Bikes: 2016 R1200RS, 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  12. #12
    I checked the tire pressure in the "info status line", and read 10 pounds under, both tires.

    Also checked with a meter to confirm when I got off.

    Ambient temp was probably 48, and I understand that there is some temperature compensation in the on-board display, but probably not that much.

    I think it's 100% possible I just didn't see the dummy light, which is why I want to do the experiment above.

    I have software version 022_005_041, but haven't heard of anyone else having similar issues.

    There _is_ also a setting to control wether to show RDC warnings, but I believe this was toggled to on, or at least I hadn't changed it since new.
    Sam Halperin
    Long Beach Island, New Jersey, USA
    sam@samhalperin.com
    "Sit and know you are sitting." -- Joseph Goldstein

  13. #13
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by shalperin View Post

    Also checked with a meter to confirm when I got off.

    Ambient temp was probably 48, and I understand that there is some temperature compensation in the on-board display, but probably not that much.

    .
    At 48 F your tire gauge will vary about 1 psi on the front tire and 2 psi when comparing to the dash reading.

    I use this chart when when airing our tires in the garage and using a tire gauge.
    Tire Pressure.jpg
    Lee
    2022 R1250RS
    MOA # 30878
    Past BMW Bikes: 2016 R1200RS, 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  14. #14
    Thanks, I did not know that it was linear.
    Sam Halperin
    Long Beach Island, New Jersey, USA
    sam@samhalperin.com
    "Sit and know you are sitting." -- Joseph Goldstein

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