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TPMS Reading on TFT

Discussion in 'GS Boxers' started by alijanah, Jun 11, 2019.

  1. alijanah

    alijanah Adventurer

    Feb 22, 2012
    Brunei Darussalam
    Hi All !

    I'm on the 2018 R1200GS Adventure with the new TFT and when I checked the TPMS reading on my tyres, its always on the low side compared to my trusty hand pump. My reference is my hand pump with a gauge. Now, it could be my hand pump gauge that could be wrong. I'm wondering what other similar owners experience with the reading on the TFT TPMS.

  2. huck629

    huck629 Been here awhile

    Feb 3, 2019
    My TFT display disagreed with my hand held tire gage and the gage on the air pump I use in my garage by about 2 or 3 psi. I used a GS911 to adjust the TPMS on the bike to agree with my gages just to make my life a little less confusing.

    I really don't know which reading was actually accurate. You can get into a lot of guessing games regarding the relative uncertainties of the measuring instruments involved but in this case I just wanted them to agree.
  3. greg.279

    greg.279 Been here awhile

    Sep 11, 2017
    My tft also reads several pounds lower than tire gauges.
  4. toolfooldan

    toolfooldan Need a witty/profound phrase to put here...

    Sep 5, 2018
    Temple, TX
    Yep, me too. Both front and back are consistently off by 4 to 5 lbs. When I bought the bike the dealership salesdude told me not to use the TFT for pressure accuracy, but use TFT to monitor for pressure loss while riding.
    Candubrain likes this.
  5. Bentspokes

    Bentspokes Adventurer

    Feb 13, 2016
    West of weird
    Yep I concur
    Never really noticed it til you stare at it for 10 hours on a long trip
    On my ole ktm I could adjust it to match my trusty gauge
    Anyway to do it on a 1250 gsa?
  6. Gadgetech

    Gadgetech Been here awhile Supporter

    Aug 6, 2017
    Cumming, GA
    The TPMS reading on the TFT is based on a temperature compensation which is probably why it's off. For me the TPMS reads higher than what my pressure gauge (accugauge with a dial) shows.

    From the manual:

    Temperature compensation
    The tire inflation pressure is temperature dependent, i.e. it increases or decreases together with the tire air temperature. The tire temperature is dependent on the outside temperature, the riding style and the length of the journey. The tire pressures are shown in the TFT display with temperature compensation and are always based on the following tire air temperature: 68 °F (20 °C) Tire pressure gages at gas stations do not make any adjustment for the air temperature, the tire pressure indicated depends on the temperature of the air in the tire. As a result, in most cases the values displayed there do not match the values shown in the TFT display.

    Tire pressure adjustment

    Compare the TPC/RDC value in the TFT display with the value on the back cover of the operating instructions. The difference between the two values must be compensated with the tire inflation pressure tester at the filling station.

    According to the rider's manual, the tire pressure should have the following value: 36.3 psi (2.5 bar)

    The following value is displayed in the TFT display: 33.4 psi (2.3 bar)

    Missing is thus: 2.9 psi (0.2 bar)

    The tester at the filling station shows: 34.8 psi (2.4 bar) To produce the correct tire pressure, this must be increased to the following value: 37.7 psi (2.6 bar)
    bmw_rider likes this.
  7. huck629

    huck629 Been here awhile

    Feb 3, 2019
    Yes, you can use a GS-911 to adjust the TPM
  8. bmw_rider

    bmw_rider Been here awhile

    Mar 6, 2016
    Gadgetech, you have it sussed.
    Mindful that every tyre pressure gauge has variances in true reading, the ONLY time any hand held tyre pressure gauge reading will match the TPMS reading shown on the dashboard is for a 'cold' tyre (not yet ridden on) at ambient temperature of 20 degrees Celsius.
    I can not fathom why people do not get that the ECU applies an algorithm to the tyre pressure the TPMS measures relative to the scientific standard temperature of 20C.
    While the actual pressure in the tyre when 'hot' (above 20C) may be 38 psi, the pressure readout shown on the dash board may be 36 psi, the pressure the tyre would have if measured at 20C.

    Maybe this will help https://www.tyresizecalculator.com/tyres/tyre-pressure-in-the-summer

    and this