Tyre pressure clarification request

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VWSE2019
Posts: 2
Joined: Fri Jan 15, 2021 10:47 am

Tyre pressure clarification request

Post by VWSE2019 » Fri Jan 15, 2021 10:57 am

Hi all - new to forum. Have a 2019 T-Roc SE and was hoping someone might be able to help me understand the best tyre pressure.

The label on the inside of the driver door has two PSI figures based on what I assume is two passengers and light luggage one with an 'i' and one without. Without the i, the recommended PSI is 35 for front and rear tyres. With the i, the PSI is 30 for front and rear.

Can someone please explain the difference between the two figures?

Thanks!

Rocadoodledo
Posts: 122
Joined: Wed Aug 14, 2019 4:18 pm
Location: Cambridgeshire

Re: Tyre pressure clarification request

Post by Rocadoodledo » Fri Jan 15, 2021 11:42 am

Hi VWSE2019 and welcome to the forum.
The recommended 35 PSI setting for two occupants plus luggage is the one to use for best blend of tyre performance and fuel consumption. The second setting of 30 PSI is a "comfort" setting, which is the choice that I use. The ride is noticeably smoother and the difference in fuel consumption is minimal in my 1.0L Design.
T-Roc 1.0L Design, Turmeric Yellow/Black
Act Displ, Nav, Dr Modes, R-Camera, Fogs, Pk Ass.
Winter Pk, Silver Rails, Voice Activ, Lumb Sup.
Ordered 21/3/19
St2 : 26/3/19
St3 : 18/10/19
St5a&5b : 13/11/19
St6 : 03/12/19
St7 : 13/12/19
Collected 20/12/19

Impala
Posts: 2077
Joined: Sat May 12, 2018 3:03 pm

Re: Tyre pressure clarification request

Post by Impala » Fri Jan 15, 2021 1:39 pm

Also worth noting that VW no longer provide 'comfort' pressures on the door label on the latest cars. Perhaps it has an adverse effect on stability and road holding, or just encourages people not to check their pressures so often.
1.5 TSI DSG R-Line MY19 Indium Grey, rear view camera, park assist.
Ordered 22/06/18
Built w/c 25/03/19 :(
With dealer 13/05/19 :P
Collected 20/05/19 :D

Rocadoodledo
Posts: 122
Joined: Wed Aug 14, 2019 4:18 pm
Location: Cambridgeshire

Re: Tyre pressure clarification request

Post by Rocadoodledo » Fri Jan 15, 2021 5:58 pm

Impala wrote:
Fri Jan 15, 2021 1:39 pm
Also worth noting that VW no longer provide 'comfort' pressures on the door label on the latest cars. Perhaps it has an adverse effect on stability and road holding, or just encourages people not to check their pressures so often.
Yes, that's a possibility, although with my non-agressive driving style I probably wouldn't notice slight handling changes.
Another possible reason for VW to have stopped providing "comfort" pressure settings is that the slight increase in tyre drag probably has an adverse effect on emissions.
T-Roc 1.0L Design, Turmeric Yellow/Black
Act Displ, Nav, Dr Modes, R-Camera, Fogs, Pk Ass.
Winter Pk, Silver Rails, Voice Activ, Lumb Sup.
Ordered 21/3/19
St2 : 26/3/19
St3 : 18/10/19
St5a&5b : 13/11/19
St6 : 03/12/19
St7 : 13/12/19
Collected 20/12/19

Hawkeye
Posts: 953
Joined: Fri Oct 12, 2018 2:36 pm

Re: Tyre pressure clarification request

Post by Hawkeye » Fri Jan 15, 2021 10:53 pm

You also have to remember that with lower tyre pressures, handling (under more extreme situations) would be affected, the lower pressure would also make the tyre run hotter (causing accelerated wear) and make it more prone to punctures (and whilst you may say that you don't drive in a sporty manner, I'm thinking more when "situations" may occur when you want all the grip you want and may have to take evasive actions). Braking performance with the lower pressure would also be affected, more so in wet weather, with it potentially taking longer for the car to stop.

That's why I think the "comfort" setting was removed - too confused and just not practical.
R-Line 2.0TSi DSG 4MOTION
Silver White with Black Roof
Panoramic Sunroof
'Beats' Sound system
Electric Tailgate
Rear View Camera
Park Assist
Driver Assistance Pack Plus

Ordered 20-10-18
Collected 19-03-19

VWSE2019
Posts: 2
Joined: Fri Jan 15, 2021 10:47 am

Re: Tyre pressure clarification request

Post by VWSE2019 » Tue Jan 19, 2021 5:00 pm

I must admit, after reducing them to 30 from 35, it's a noticeable less enjoyable drive - can feels low and heavy too. Back up to 35 I think..!

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Deleted user 925
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Re: Tyre pressure clarification request

Post by Deleted user 925 » Tue Jan 19, 2021 7:46 pm

VWSE2019 wrote:
Tue Jan 19, 2021 5:00 pm
I must admit, after reducing them to 30 from 35, it's a noticeable less enjoyable drive - can feels low and heavy too. Back up to 35 I think..!
Softer tyres should mean a more comfortable ride as the tyres absorb more of the bumps.
I personally go between the two tyre pressure options 😷
September 2018 1.5 tsi R-line manual,
revena blue,
black roof,
towbar.

Hawkeye
Posts: 953
Joined: Fri Oct 12, 2018 2:36 pm

Re: Tyre pressure clarification request

Post by Hawkeye » Tue Jan 19, 2021 11:04 pm

Deleted user 925 wrote:
Tue Jan 19, 2021 7:46 pm
Softer tyres should mean a more comfortable ride as the tyres absorb more of the bumps.
Sorry but I can't agree with you, tyres are not built to absorb bumps, suspension is - if you start putting more pressure on the tyre by lowering the pressure to theoretically absorb bumps then you are weakening the tyre structure and tyre integrity with every bump you go over.
R-Line 2.0TSi DSG 4MOTION
Silver White with Black Roof
Panoramic Sunroof
'Beats' Sound system
Electric Tailgate
Rear View Camera
Park Assist
Driver Assistance Pack Plus

Ordered 20-10-18
Collected 19-03-19

User avatar
Deleted user 925
Posts: 276
Joined: Sun Dec 20, 2020 1:53 pm

Re: Tyre pressure clarification request

Post by Deleted user 925 » Tue Jan 19, 2021 11:25 pm

Hawkeye wrote:
Tue Jan 19, 2021 11:04 pm
Deleted user 925 wrote:
Tue Jan 19, 2021 7:46 pm
Softer tyres should mean a more comfortable ride as the tyres absorb more of the bumps.
Sorry but I can't agree with you, tyres are not built to absorb bumps, suspension is - if you start putting more pressure on the tyre by lowering the pressure to theoretically absorb bumps then you are weakening the tyre structure and tyre integrity with every bump you go over.
I didn't say they were built for absorbing bumps 🤷‍♂️
It's common sense that the less air pressure there is in a tyre the more flex there will be in the rubber compound, therefore the road surface imperfections will be better absorbed.
Also I never mentioned going outside of volkswagens recommended tyre pressures 😎
September 2018 1.5 tsi R-line manual,
revena blue,
black roof,
towbar.

peterh
Posts: 159
Joined: Tue Jun 16, 2020 2:57 pm

Re: Tyre pressure clarification request

Post by peterh » Wed Jan 20, 2021 11:20 am

Car tyres do absorb some some of road irregularity and bumps. The flexing of tyres is taken into consideration when a car suspension is designed.

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