Tyre Pressure Monitor

[pkd]

I have the tyre pressure monitor on my 2010 1200GS, and I am not sure whether to believe it or not. I recently had new tyres and they inflated them to 2.2 / 2.5 which the computer thing thinks is 1.9 / 2.3.

Also are the guages in petrol stations correct as I could go by that or inflate to the computer? Or should I buy one for at home and if so what's recommended......

 

[Robbo1200ADV]

Get a proper tyre pressure gauge ,forecourt ones are not accurate I use a foot pump and inflate it while the bike is running in TP monitor mode

 

[bose]

tyre pressure

I have the tyre pressure monitor on my 2010 1200GS, and I am not sure whether to believe it or not. I recently had new tyres and they inflated them to 2.2 / 2.5 which the computer thing thinks is 1.9 / 2.3.

Also are the guages in petrol stations correct as I could go by that or inflate to the computer? Or should I buy one for at home and if so what's recommended......

Yep check your own tyres at home b4 you ride i.e cold tyres with a decent gauge and adjust as necessary,also you can have your tpn changed to psi at dealers if it makes things easier !! also tpm only works truely when tyres are up to tempreture 20c,dont think theyre accurate tho as mine always say 1-2 psi difference from my pencil gauge?????

 

[gazzauk]

While were on the subjecct of TPM s , i have read that BMW via their workshop system can change the bar read out to psi , but while having some warranty work done i asked the dealer would he mind doing this, seeing as the bike would be hooked up to the diagnostic computer anyway , and i was told that its not possible to change the read out " as the Germans work to a metric system ". Can anybody clarify that the TPM read out can be changed to PSI.

 

[Buz]

While were on the subjecct of TPM s , i have read that BMW via their workshop system can change the bar read out to psi , but while having some warranty work done i asked the dealer would he mind doing this, seeing as the bike would be hooked up to the diagnostic computer anyway , and i was told that its not possible to change the read out " as the Germans work to a metric system ". Can anybody clarify that the TPM read out can be changed to PSI.

I think someones pulling your pi55er Gaz, as mentioned above they should be able to change it, also the Germans use KPH but they manage to change the speedo's, slightly different i know but it cant be rocket science

 

[Martyn H]

While were on the subjecct of TPM s , i have read that BMW via their workshop system can change the bar read out to psi , but while having some warranty work done i asked the dealer would he mind doing this, seeing as the bike would be hooked up to the diagnostic computer anyway , and i was told that its not possible to change the read out " as the Germans work to a metric system ". Can anybody clarify that the TPM read out can be changed to PSI.

I, & am sure many others have had the display changed to PSI.
At the same time I also had the clock changed to the 24 hour format.
I chose to have the indicator self-cancel turned off.
You can have the temperature display in degrees F or C.
If your dealers mechanics don't know that................

 

[Beemerman59]

I, & am sure many others have had the display changed to PSI.
At the same time I also had the clock changed to the 24 hour format.
I chose to have the indicator self-cancel turned off.
You can have the temperature display in degrees F or C.
If your dealers mechanics don't know that................

I had the above done too except the clock which I prefer in 12 hour.

 

[bose]

bar-psi

While were on the subjecct of TPM s , i have read that BMW via their workshop system can change the bar read out to psi , but while having some warranty work done i asked the dealer would he mind doing this, seeing as the bike would be hooked up to the diagnostic computer anyway , and i was told that its not possible to change the read out " as the Germans work to a metric system ". Can anybody clarify that the TPM read out can be changed to PSI.

Had mine changed to psi at 18000 service at north oxford bmw without an issue

 

[BAKERMAN]

extra £35 could have had them on my Golf

 

[andyclift]

The tyre pressure spec is for a particular temperature (can't remember what) as, of course, the pressure varies with temperature. The pressure shown on the dash is not the actual pressure in the tyre, it shows what the pressure will be when the tyres are at the correct temperature.

When you use a garage or DIY pressure gauge it shows the actual pressure but does not take the temperature into account.

Assuming both systems are working accurately the BMW pressure will be the one to go with.

 

[SCP]

At the same time I also had the clock changed to the 24 hour format.

Now thats something I'll add to my list of things to get done.

 

[Pukmeister]

The tyre pressure spec is for a particular temperature (can't remember what) as, of course, the pressure varies with temperature. The pressure shown on the dash is not the actual pressure in the tyre, it shows what the pressure will be when the tyres are at the correct temperature.

When you use a garage or DIY pressure gauge it shows the actual pressure but does not take the temperature into account.

Assuming both systems are working accurately the BMW pressure will be the one to go with.

How does it know ????

 

[andyclift]

How does it know ????

Maybe it has read page 92 of the manual that comes with the bike!!

Quote "A sensor integrated into each tyre measures the air temperature and the air pressure inside the tyre and transmits this information to the control unit.

Page 93 of the manual

Quote " Tyre pressure is a temperature sensitive variable: pressure increases as tyre temperature rises..........The tyre pressure readings shown by the multifunction display are temperature compensated; the reference tyre temperature for these readings is always 20 degrees C. The air lines available to the public in petrol stations and motorway service areas have gauges that to not compensate........."

There is a lot more useful info on this in the manual together with a table showing what readings are required on an external gauge to get the right pressure in the tyre in relation to what the bike is showing.

 

[Beemerman59]

Maybe it has read page 92 of the manual that comes with the bike!!

Quote "A sensor integrated into each tyre measures the air temperature and the air pressure inside the tyre and transmits this information to the control unit.

Page 93 of the manual

Quote " Tyre pressure is a temperature sensitive variable: pressure increases as tyre temperature rises..........The tyre pressure readings shown by the multifunction display are temperature compensated; the reference tyre temperature for these readings is always 20 degrees C. The air lines available to the public in petrol stations and motorway service areas have gauges that to not compensate........."

There is a lot more useful info on this in the manual together with a table showing what readings are required on an external gauge to get the right pressure in the tyre in relation to what the bike is showing.

I have always struggled with understanding this compensation to 20 degrees malarky. I always set the pressures I want cold with a guage. When I ride the bike, to start with the TPM's read the same as my guage did, then as the tyre warms up the pressure increases by about 2psi which is what you would expect. If I test the pressure on my guage with the tyre warm, it too gives the higher reading - again what you would expect. So, I have given up trying to understand and just set the pressures as I have done for 32 years. I do however find the TPM's useful in letting me know of slow punctures and telling me when I must put some air in.

 

[andyclift]

Realistically I think BMW include the temp compensation because they can. It costs next to nothing to do it and its a good sales feature. Although the physics is correct I wonder in the real world if a couple psi makes a blind bit if difference. My last gs did not have the monitor and sometime I checked pressure and found it had dropped 6 - 8 psi but it not seem to affect the handling. I doubt the gauges that you buy in Halford etc. that just push on the valve are accurate within a couple of psi anyway.

I also think the monitor is worth having to warn me of a puncture BEFORE I go into a bend.

 

[bmwbikeruk]

I think someones pulling your pi55er Gaz, as mentioned above they should be able to change it, also the Germans use KPH but they manage to change the speedo's, slightly different i know but it cant be rocket science

This is not rocket science! My humble scooter, namely Vespa GTS 250ie has electronic odometer and trip meter and I can switch between miles and kilometres at the touch of a button immediately after I switch ignition key on! Why can't BMW do same?

 

[(RIP) Johno23]

I think the main purpose of the sensor is not to tell the current psi/bar reading but as a safety feature warning of deflation of the tyre.

 

[twincam]

tyre s

sainsburys petrol fourcourt tyre pumps are accurate, & free!!!!!!!

 

[andyclift]

sainsburys petrol fourcourt tyre pumps are accurate, & free!!!!!!!

Unfortunately it is a little hard to drive with the tyre gauge connected.