Author [NL] [FR] [ES] [DE] [SE] [IT] Topic: TPMS  (Read 2615 times)

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    TPMS
    on: Oct 01, 2021, 01.29 am
    Oct 01, 2021, 01.29 am
    Was out on a bike ride over the past week.  One morning headed a half mile down the road to gas up.  On the way the TPMS showed 11 psi in the rear tire.  About the time I saw the reading I pulled out in the highway and noticed something wrong.  Gassed up and parked in the shade to investigate.  I had a screw in the rear tire.  I plugged it and filled with air.  I had 40 psi in the front and rear tires.  Funny thing is, the red warning light from the TPMS didn't come on with 11 psi in the tire.  The rest of the ride for about 1000 miles the red TPMS light stayed on.  The system showed 40 to 43 psi front and rear for the rest of the trip.  Tire pressure gauge showed the same. 

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    Re: TPMS
    Reply #1 on: Oct 01, 2021, 01.05 pm
    Oct 01, 2021, 01.05 pm
    40 psi in the rear is low pressure as far as the monitors are considered.  When the weather cools I notice that the warning will come on at that level, then it's back to the garage and pressure it up some for the current temperature's requirement.  I don't understand your comment.  You say that you pulled out onto the road and it showed 11 psi, but then you say it had never come on when it had 11 psi?  On startup it may can take as much as a tenth of mile for mine to read the pressure since the signal is not updated by a constant stream of information.  It appears that the signal is transmitted either on a timed basis or a pressure change basis, not sure which or if it's both.  To give you an idea, I run 43 psi in my rear all the time and out on the road for a while in some twisties it will show47 to 48, unless it's summer weather, then it's 49.
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    Re: TPMS
    Reply #2 on: Oct 01, 2021, 04.00 pm
    Oct 01, 2021, 04.00 pm
    My main point was that the red warning light did not come on when the rear tire was reading 11 psi on the display.  This was the reading from the bike display.  Seems strange that a reading of 11 psi did not trigger the red warning light but a reading of 41 psi did trigger the red warning light.  I know that there may be a time delay involved but it seems the warning light would be triggered immediately upon a very low reading. 

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    Re: TPMS
    Reply #3 on: Oct 01, 2021, 07.00 pm
    Oct 01, 2021, 07.00 pm
    That is odd.
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    Re: TPMS
    Reply #4 on: Oct 02, 2021, 03.03 pm
    Oct 02, 2021, 03.03 pm
    As a side question are the batteries in the TPMS units OK?  Showing Low voltage at times?  I've had a warning light at just a couple pounds low pressure so 11 should have long triggered it.

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    Re: TPMS
    Reply #5 on: Oct 02, 2021, 04.34 pm
    Oct 02, 2021, 04.34 pm
    I replaced the batteries last winter.  I had low battery status prior to that.  Everything has been fine since I replaced the batteries. 

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    Re: TPMS
    Reply #6 on: Oct 02, 2021, 08.19 pm
    Oct 02, 2021, 08.19 pm
    Yes, in fact, the red light should have come on.

    When she saw the wheel pressure drop at 11 psi, could she see the text on the instrument panel that said low rear wheel pressure, or was there no text at all?
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    Re: TPMS
    Reply #7 on: Oct 02, 2021, 11.39 pm
    Oct 02, 2021, 11.39 pm
    The display read 11 psi and 37 psi.  It was about 45 degrees that night so the front tire a little low that morning.  I usually leave the TPMS display on so that tire psi is displayed when I start riding. 

     



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