TPMS possible issue

[MIKE R]

I have a 1250GSA with the tyre pressure monitoring system and run the tyres at 36F 42R psi

These pressures are checked by my trusty pressure gauge which always collates with the aftermarket TPMS on my Yamaha

Whilst the front reads 36psi on the TFT as it should, the rear registers 44.9

Is it a common issue for the TPMS to be so inaccurate? Obviously I'll mention it to my dealer when if everything gets back to normal?

Mike

 

[Engineer]

I have a 1250GSA with the tyre pressure monitoring system and run the tyres at 36F 42R psi

These pressures are checked by my trusty pressure gauge which always collates with the aftermarket TPMS on my Yamaha

Whilst the front reads 36psi on the TFT as it should, the rear registers 44.9

Is it a common issue for the TPMS to be so inaccurate? Obviously I'll mention it to my dealer when if everything gets back to normal?

Mike

Yes - but are you doing the comparisons at the same temperature?

 

[RedRick Esq.]

It is one of the reasons i hate the whole TPMS idea

I have had it on a couple of bikes and have never managed to get it to collaborate with any of my gauges and as my favourite gauge is calibrated to less than .2 pf a psi i take the gauge over the TPMS

All that said yours appears to be slightly odd as your gauge adds up at the front but not at the rear so i suspect a fault

I have never needed TPMS to tell me i have a puncture so with it i just look and think they are wrong when i know they are not

Glad i dont have it anymore

 

[Doc]

I don't look at it.Tyre pressure gauge every time when tyres are cold. Can't understand how its accurate anyway.

 

[Engineer]

I believe The TPMS is supposed to give the equivalent cold temperature pressure even when the tyres have warmed up and the pressure increases as the ideal gas equation would predict, PV = nRT; however I don’t think it is very accurate.

 

[MIKE R]

Yes. The figures on the TFT do not change as the tyre heats up.

 

[Engineer]

Yes. The figures on the TFT do not change as the tyre heats up.

They do a little bit, the temperature compensation is not that good.

 

[Doc]

I believe The TPMS is supposed to give the equivalent cold temperature pressure even when the tyres have warmed up and the pressure increases as the ideal gas equation would predict, PV = nRT; however I don’t think it is very accurate.

I agree..Ten minute job with a gauge before a ride or check if bike has not been used for a while.Job done.

 

[mw3230]

I suggest that we view the TPMS not as an accurate gauge to confirm tyre pressures are correct - a good quality manual pressure gauge is the correct tool for that job - but as a device which, whilst riding, will give an early warning of a reduction in pressure, thus allowing the rider to stop and check before anything more disastrous occurs. In this way the accuracy of the pressure indicated is less important (especially as we will all have done a thorough pre ride check of the bike) than the warning that there has been a change to the pressure in one of the wheels

 

[Nutty]

I agree..Ten minute job with a gauge before a ride or check if bike has not been used for a while.Job done.

Ten?

 

[Doc]

Ten?

Well depending on how many pumps you might need 5 minutes then if no pumping required.

 

[RedRick Esq.]

20 seconds to give em a kick

 

[Santa-2512]

Never understood why we have to have em in Bars ? should be Psi

pre ride check, bike off stand , tyres look round - yes - ride No - pump up - ride

 

[Santa-2512]

20 seconds to give em a kick

20? how long is your bike,

 

[RedRick Esq.]

20? how long is your bike,

when i'm kicking them i like to pretend its Engineer

 

[Doc]

when i'm kicking them i like to pretend its Engineer

That bloke gets some stick

 

[leadfarmer]

Mine are pretty much bang on with the gauge on my airman pump

So either they’re both right or they’re both wrong

 

[ianm00]

Never understood why we have to have em in Bars ? should be Psi

pre ride check, bike off stand , tyres look round - yes - ride No - pump up - ride

I used the motoscan ap and OBDlink LX to change mine from bar to psi.

 

[Engineer]

I suggest that we view the TPMS not as an accurate gauge to confirm tyre pressures are correct - a good quality manual pressure gauge is the correct tool for that job - but as a device which, whilst riding, will give an early warning of a reduction in pressure, thus allowing the rider to stop and check before anything more disastrous occurs. In this way the accuracy of the pressure indicated is less important (especially as we will all have done a thorough pre ride check of the bike) than the warning that there has been a change to the pressure in one of the wheels

Exactly that

 

[mrtee43]

I used the motoscan ap and OBDlink LX to change mine from bar to psi.

Or if you have a BMW Navigator on, the pressures displayed on that are in Psi.