Tyre Pressures

Luke_bank

Active Member
Aug 11, 2017
383
45
Am I missing something here?

Just checked my tyre pressures for the first tjme, in order to set the monitoring system. They were at a whopping 45 and 46 psi, presumably inflated by the dealer.

I’ve now inflated them as per the top like on the date label. 36psi on the front & 33 back.

Why were they so high?


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3dfd6ae2bb5e3b9ceb832523b19bc205.jpg
 
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martin j.

Active Member
Feb 11, 2007
1,996
889
Fife
Badly maintained gauges in workshops are often a cause, never seen gauges looked after by techs, they are in fact quite delicate instruments, and of course techs usually DGAF.
 

Luke_bank

Active Member
Aug 11, 2017
383
45
I’ve put mine down to the recommended pressures. I thought having them too high causes uneven tyre pressure?

Be interesting to see deflating them causes a change in fuel consumption. It’s been superb so far.

I used self service pump at my local Esso, that might not be that accurate to be fair.

Anyone shed any light on why the pressures in the second row differ but appear to represent the same amount of passengers & luggage? Nothing in the manual to explain it.


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'& Son' managed

Third Party
Mar 2, 2018
269
89
South Coast
Anyone shed any light on why the pressures in the second row differ but appear to represent the same amount of passengers & luggage? Nothing in the manual to explain it.

Usually with VAG vehicles the differences refer to an alternate size of tyre that may be fitted, but the label should make this fairly clear.

Otherwise, it is likely to be that the higher pressures listed for the same load of passengers & luggage refer to higher/motorway-speed use. However, or a snow/star-like symbol indicates pressures recommended for winter tyres.
 

Luke_bank

Active Member
Aug 11, 2017
383
45
Usually with VAG vehicles the differences refer to an alternate size of tyre that may be fitted, but the label should make this fairly clear.



Otherwise, it is likely to be that the higher pressures listed for the same load of passengers & luggage refer to higher/motorway-speed use. However, or a snow/star-like symbol indicates pressures recommended for winter tyres.



Thanks for that .

Can you see the image in my original post? The second row isn’t explained anywhere. Might pop into my local dealer.


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'& Son' managed

Third Party
Mar 2, 2018
269
89
South Coast
I can see the image now, (must admit I missed it first time) Have to agree that label is not very clear. It seems to imply the pressures listed are good for both 16" and 18" options at least.

From what info it does impart, I would be trying 34 PSI in the fronts and 32 PSI in the rears for normal load/driving situations at first and see how you and the car likes it.
 

Luke_bank

Active Member
Aug 11, 2017
383
45
I can see the image now, (must admit I missed it first time) Have to agree that label is not very clear. It seems to imply the pressures listed are good for both 16" and 18" options at least.



From what info it does impart, I would be trying 34 PSI in the fronts and 32 PSI in the rears for normal load/driving situations at first and see how you and the car likes it.



I’ve got 17s.

Yeah that’s what I’ve done. It already feels smoother over the bumps. I thought it felt quite harsh over bumps, the extra 10psi could explain it.
 

kazand

Is powered by Medtronics
Jun 6, 2010
4,138
73
Brum
The second set of pressures are a 'comfort' setting or something like that, I'm sure it's in the Passat handbook I'll have a look later.
 

jepsonj

Active Member
Mar 5, 2018
4
2
From the ST manual (page 280)

Depending on the vehicle, tyre pressure can
be adjusted to medium load to improve driving
comfort (tyre pressure i). When driving
with comfort tyre pressure fuel consumption
may increase slightly.​

The symbol may have been lost in copy/paste, but it appears to be refeering to the second row with the information symbol.

So, a comfort mode as mentioned.
 

Luke_bank

Active Member
Aug 11, 2017
383
45
Interesting, thank you. I’ll have to have a look at the manual again, I don’t recall seeing that. Anyway, those pressures seems really low, I wonder how the car would handle.


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KXL

KXL
Dec 15, 2016
1,581
197
London, UK
Well the delivery guy mentioned the pressures were high due to it being strapped down on the transporter, and onto the ship as well.

Whether it's true or not, I don't know. My recommended PSIs were 38/35 for normal, and 33/30 for 'Komfort' for 3 people + 1 bag diagram.

When I took delivery of it, after a few hours of cooling down, it was 41/38 or something similar.

I have a handheld device, that measures, typre pressure, can break glass, cut seatbelt, flashlight and so on. When I check them after I've driven, usually PSIs are about 3-4 psi higher than cold PSIs on front, and 1-2 PSIs higher on rears.

I now run them 36-37 fronts and 33-34 rears. Happy compromise for me.

These are 40 profile tyres. I guess the lower the profile the higher the PSIs. Previously had 55 profile tyres, 16 inch, and recommended was 32/29 PSI.

Btw, R16 and R18 at the bottom...seems to be the spare tyre inflation info
 
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Luke_bank

Active Member
Aug 11, 2017
383
45
I might get myself one of these handheld devices. Are they expensive?

I don’t know how accurate the petrol station forecourts machines are. My tyres wouldn’t have been warm as such, used them for all of 300m to get to the forecourt.

I’ll see how the lower pressure performs on the way to work tomorrow.


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KXL

KXL
Dec 15, 2016
1,581
197
London, UK
I might get myself one of these handheld devices. Are they expensive?

I don’t know how accurate the petrol station forecourts machines are. My tyres wouldn’t have been warm as such, used them for all of 300m to get to the forecourt.

I’ll see how the lower pressure performs on the way to work tomorrow.


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Mine was this one: but I got it...around £7 few years ago...

Seems accurate enough, matches with the tyre air thingi...at the petrol stations...right after I top up air, check with the handheld, they are the same...values...

At least if you put too much air, you can let air out, and check with the handheld thingi...how much you have left in the tyre...air wise...

https://www.amazon.co.uk/Digital-Pr...0413&sr=8-23&keywords=tyre+pressure+guage+car
 
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