Another tyre pressure question

[David64]

I know that the stated pressures are 2.5 and 2.9 bar and that these are shown on the dash for a standard 20 degrees Celsius.
So…..

How come when I set off it shows 2.5 and 2.9 bar but these can increase to say 2.7 and 3.1 bar after riding for a while? Yes I know the tyres have warmed up and so the pressures will rise BUT why does the dash still not show 2.5 and 2.9 if it is allowing for the tyre temperatures at any time?

 

[bosnjo]

Well, I can't understand your doubt. The dash is showing the pressure at the moment. The manufacturer recommends the pressure to be used on cold tyre. Later, tyre warms up and pressure goes up. What is wrong with that? It has and always will be like that, car, bike, plane or truck...

 

[David64]

Well, I can't understand your doubt. The dash is showing the pressure at the moment. The manufacturer recommends the pressure to be used on cold tyre. Later, tyre warms up and pressure goes up. What is wrong with that? It has and always will be like that, car, bike, plane or truck...

Yes but it states that the TPMS units both measure the pressure and also the temperature at the time of measurement. The reading on the dash supposedly corrects the tyre pressure to what it would be at 20 degrees. Logically therefore as the tyre temperature increases this should be taken into account and the pressure shown on the dash adjusted to reflect that at 20 degrees.

Hence why would the “shown” pressures increase with temperature as they are supposed to be corrected

 

[theoneandonly]

oh dear.

 

[AberdeenAngus]

oh dear.

Indeed.

 

[dean0n0]

It's a worry.

 

[twizzle]

It's a worry.

Only when it’s flat on the bottom…

 

[dean0n0]

Only when it’s flat on the bottom…

At 20°?

 

[bosnjo]

Well, I think it's major flaw of such expensive vehicle. You should go to your dealer and complain. Let's see what they say.
Or, try different brand of motorcycle... Actually, try different kind of vehicle, maybe motorcycle is not the right toy for you...

 

[clutchspring]

Step away slowly from the motorcycle and phone for help ¡¡!!!!!!¡

 

[theoneandonly]

Thor , can fix this .

https://www.thorhammer.com/product/03-210/

how to ,

wearing correct PPE ,

practice bringing T3 ( chosen size) to within 1 inch of offending part , do this 10 times , do not hit offending part.

now shout, at offending part , practice , as above , do not hit the part.

remove PPE.

go for tea and a fag , and a biscuit.

don PPE , approach offending part with Thor, held behind back . shout at offending part , bring Thor out from behind back , and bring it down on offending part , ( as practiced previously ) this time , following through , repeat until you feel better.

IF you have done this correctly , offending part is now , dead.

your problem is solved.

 

[JJH]

The only real use of such a device is to warn you of pressure loss. It doesn’t take the place of regular tyre checks. Do you know what the pressure should be at varying temperatures? Don’t worry about it. Yellow warning check soon. Red stop. JJH

 

[Deleted account 250319001]

The only real use of such a device is to warn you of pressure loss. It doesn’t take the place of regular tyre checks. Do you know what the pressure should be at varying temperatures? Don’t worry about it. Yellow warning check soon. Red stop. JJH

Exactly.
Ragging it through some stunning Norwegian roads..... Looked down. RED warning. Rear tyre out of tolerance. STOP and check.
8;30 minutes later back up and continued ragging........

EDIT :
That's not the bike laying on its side, that UKGS turning my picture over

 

[Piggers]

it shows a higher Pressure because the pressure has increased, irrespective if the pressure shown is temperature compensated in any way or not.

 

[Engineer]

I know that the stated pressures are 2.5 and 2.9 bar and that these are shown on the dash for a standard 20 degrees Celsius.
So…..

How come when I set off it shows 2.5 and 2.9 bar but these can increase to say 2.7 and 3.1 bar after riding for a while? Yes I know the tyres have warmed up and so the pressures will rise BUT why does the dash still not show 2.5 and 2.9 if it is allowing for the tyre temperatures at any time?

Good question - I think the ability to temperature correct is not that accurate. However ideally you need to set your pressures when the ambient is 20 or 21 i.e the reference temperature. You will then find the change as they warm up to be much less.

 

[David64]

Good question - I think the ability to temperature correct is not that accurate. However ideally you need to set your pressures when the ambient is 20 or 21 i.e the reference temperature. You will then find the change as they warm up to be much less.

Thank you for what is a reasonable and thought out answer….which makes logical sense.
As an Engineer myself I like things to follow through correctly and fully and it just niggled me when it was detailed on here that the gs automatically corrects the tyre pressure readings by compensating for the temperature in the tyres.

To the other pompous up your own a***s who try to feel superior by the use of (what is really childish and low level) sarcasm……I hope you all feel content at trying to take the pee out of someone that you do not know as opposed to possibly trying to answer the question, and who knows, actually try to help that person.
Having done trackdays for over 25 years on a wide range of sport bikes using full race slicks with tyre warmers etc etc I am reasonably conversant with the concept of tyres heating up and with the associated increases in tyre pressures. But hey ho….your informative responses speak volumes on their own.
Cheers *

 

[Teeonethousand]

My understanding is that it corrects for the outside temperature (not the tyre temp) so that the temp it shows you is the temp that it would be if the outside temp was 20. So the tyre pressure goes up and down with heat in the tyre but not with change in outside air temp. It’s a weird one for sure and the advice to treat it as a ‘loss of pressure’ warning system is the way I treat it.

 

[David64]

My understanding is that it corrects for the outside temperature (not the tyre temp) so that the temp it shows you is the temp that it would be if the outside temp was 20. So the tyre pressure goes up and down with heat in the tyre but not with change in outside air temp. It’s a weird one for sure and the advice to treat it as a ‘loss of pressure’ warning system is the way I treat it.

Thanks…makes sense

 

[JJH]

Good question - I think the ability to temperature correct is not that accurate. However ideally you need to set your pressures when the ambient is 20 or 21 i.e the reference temperature. You will then find the change as they warm up to be much less.

Not too often we get 21 degrees round here. Might wait 6 months or more. I look at my tyre pressure weekly. JJH

 

[ogni]

Oh please help , where m i ?

infested waters ???