Tyre Pressures

1
Roger,
 
No, there are reasons why there is a difference front to rear and this is related to vehicle dynamics, which gets a bit involved.  The end result of the different pressures is that the front and rear tyres end up with the same rolling circumference when the vehicle is under way.
 
 
 
 
----- Original Message -----
From: Roger Bell
Sent: Sunday, April 27, 2008 11:59 PM
Subject: [Syncro_T3_Australia] Bed in raised roof plus Viscous Coupling

Dear Les,
 
Finally regarding the recent VC discussion which emphasised the need to keep all tyre diameters the same, why do the VW inflation stickers specify a 4lb/  0.3kpa differential between front and rear tyres? Would it be better to run them all the same?
 
Cheers
Roger
T3 Syncro Campervan

.

2

Tony,

 On the driver's door frame is a placard telling you what tyre pressures to use.  Follow it!

 Les

 

3
Les

Some vehicles placards may have faded due to "Door Droop".

Does anyone have a photo of this placard?

Mark.

On Thu, Jul 9, 2009 at 6:06 PM, Les Harris <leslieharris@optushome.com.au> wrote:


Tony,

On the driver's door frame is a placard telling you what tyre pressures to use. Follow it!

Les


4
Mine wore off very quickly due to sliding out of the seat. Only lasted a year or two I think.

Bruce


On 09/07/2009, at 6:53 PM, Mark Kofahl wrote:

Les

Some vehicles placards may have faded due to "Door Droop".

Does anyone have a photo of this placard?

Mark.

On Thu, Jul 9, 2009 at 6:06 PM, Les Harris <leslieharris@ optushome. com.au> wrote:



Tony,

 On the driver's door frame is a placard telling you what tyre pressures to use.  Follow it!

 Les

 



5
Les,
 
The reason I am asking is that someone told me that if my tyre pressures are different, say if one tyre deflates over time, then the viscous coupler will operate ? I just wondered if this is correct?
 
Tony 
 
 
----- Original Message -----
From: Les Harris
Sent: Thursday, July 09, 2009 4:06 PM
Subject: [Syncro_T3_Australia] Tyre Pressures

Tony,

 On the driver's door frame is a placard telling you what tyre pressures to use.  Follow it!

 Les

6

Tony,

 

Yes, that is correct but that does not in turn suggest that they tyre pressures front and rear should be the same.  They should be as per the placard.  I am trying to post a picture of the tyre placard but the current Yahoo outage is blocking me.  I will send it to your email address.

Les


--- In Syncro_T3_Australia@yahoogroups.com, "Tony" <ricketts.tony@...> wrote:

>
> Les,
>
> The reason I am asking is that someone told me that if my tyre pressures are different, say if one tyre deflates over time, then the viscous coupler will operate ? I just wondered if this is correct?
>
> Tony
>
>
> ----- Original Message -----
> From: Les Harris
> To: Syncro_T3_Australia@yahoogroups.com
> Sent: Thursday, July 09, 2009 4:06 PM
> Subject: [Syncro_T3_Australia] Tyre Pressures
>
>
>
>
>
>
> Tony,
>
> On the driver's door frame is a placard telling you what tyre pressures to use. Follow it!
>
> Les
>

7

Les & Tony,

 

I find that strange. Surely IF tyre pressures were important to wheel speeds a front/rear differential could affect the VC, whereas a side to side differential would only matter if a diff-lock was engaged. However, I remember a long and technical debate on this subject many years ago (I think on the American site), and the general consensus was that moderate changes in tyre pressures don’t affect the rolling diameter much at all. There is, after all, a steel belt around the tyre which is not going to stretch. With moderate differences, even though the loaded radius might seem affected the tyre will act (in a minor way) like a tank track, and still traverse the same distance for each rotation. Only if deflation is substantial (ie, nearly flat) will the tyre squirm enough to change the effective rolling diameter. Now, I’d defer to Les’s technical expertise on this, but it makes sense to me.

 

BRIAN REED

FAIRFIELD NATURAL THERAPIES

185 Wingrove St

Fairfield, Vic. 3078

03 9481 5673   0407 319 521

From: Syncro_T3_Australia@yahoogroups.com [mailto: Syncro_T3_Australia@yahoogroups.com ] On Behalf Of Les Harris
Sent: Thursday, 9 July 2009 8:36 PM
To: Syncro_T3_Australia@yahoogroups.com
Subject: [Syncro_T3_Australia] Re: Tyre Pressures

 




Tony,

 

Yes, that is correct but that does not in turn suggest that they tyre pressures front and rear should be the same.  They should be as per the placard.  I am trying to post a picture of the tyre placard but the current Yahoo outage is blocking me.  I will send it to your email address.

Les


--- In Syncro_T3_Australia @yahoogroups. com , "Tony" <ricketts.tony@ ...> wrote:

>
> Les,
>
> The reason I am asking is that someone told me that if my tyre pressures
are different, say if one tyre deflates over time, then the viscous coupler will operate ? I just wondered if this is correct?
>
> Tony
>
>
> ----- Original Message -----
> From: Les Harris
> To: Syncro_T3_Australia @yahoogroups. com
> Sent: Thursday, July 09, 2009 4:06 PM
> Subject: [Syncro_T3_Australi a] Tyre
Pressures
>
>
>
>
>
>
> Tony,
>
> On the driver's door frame is a placard telling you what tyre pressures to
use. Follow it!
>
> Les
>

8
Hi All Fellow Syncro Owners, in regards to tyre pressures the ones quoted on the original placards was only for the ORIGINAL MICHELIN TYRES which have not been available for over 10 years, they were the 205R14 which was made especially for the VW SYNCRO the ones you buy now DO NOT have the same rolling diameter and are not the same tyre hence the pressures quoted dont mean anything anymore. So depending on your choice of tyre, this will affect your tyre pressures....anyway a tyre pressure range around 36-40psi is acceptable and they all shoud be of the same value of course which ever you choose.........

--- On Thu, 9/7/09, Les Harris <leslieharris@optushome.com.au> wrote:

From: Les Harris <leslieharris@optushome.com.au>
Subject: [Syncro_T3_Australia] Re: Tyre Pressures
To: Syncro_T3_Australia@yahoogroups.com
Received: Thursday, 9 July, 2009, 8:35 PM

Tony,

 

Yes, that is correct but that does not in turn suggest that they tyre pressures front and rear should be the same.  They should be as per the placard.  I am trying to post a picture of the tyre placard but the current Yahoo outage is blocking me.  I will send it to your email address.

Les


--- In Syncro_T3_Australia @yahoogroups. com, "Tony" <ricketts.tony@ ...> wrote:
>
> Les,
>
> The reason I am asking is that someone told me that if my tyre pressures are different, say if one tyre deflates over time, then the viscous coupler will operate ? I just wondered if this is correct?
>
> Tony
>
>
> ----- Original Message -----
> From: Les Harris
> To: Syncro_T3_Australia @yahoogroups. com
> Sent: Thursday, July 09, 2009 4:06 PM
> Subject: [Syncro_T3_Australi a] Tyre Pressures
>
>
>
>
>
>
> Tony,
>
> On the driver's door frame is a placard telling you what tyre pressures to use. Follow it!
>
> Les
>


Access Yahoo!7 Mail on your mobile. Anytime. Anywhere. Show me how.
9
I recently upgraded some tyres.

Michelin is just not making that 205/80/14 109 rated tyre currently (still listed in their catalogue and website) - apparently big production cut backs. That tyre had a roll circumference of 686mm. The XCD is still listed on the Michelin site: http://www.michelin.com.au/tyres/lightTruck_XCD.asp

I looked at a Hankook and Nankang in the 75 with same load, but roll circ 664 and also not available.

Finally found Maxxis 205/80/14 with load index 109 with rolling diametre of 686mm @$159.

http://www.maxxis.com/AutomobileLight-Truck/Light-Truck-SUV/UE-168N-Bravo-Series.aspx

Click Specs you will see all available - I have the 205/14/80 with 109 Load Index which is 100% correct to the original and correct for the 6J original VW alloy RIM that I have.

Issues like tread pattern, ride quality etc will be of course subjectively different.

Mark.










On Fri, Jul 10, 2009 at 8:42 AM, bettaitems <bettaitems@yahoo.com> wrote:


Hi All Fellow Syncro Owners, in regards to tyre pressures the ones quoted on the original placards was only for the ORIGINAL MICHELIN TYRES which have not been available for over 10 years, they were the 205R14 which was made especially for the VW SYNCRO the ones you buy now DO NOT have the same rolling diameter and are not the same tyre hence the pressures quoted dont mean anything anymore. So depending on your choice of tyre, this will affect your tyre pressures....anyway a tyre pressure range around 36-40psi is acceptable and they all shoud be of the same value of course which ever you choose.........

--- On Thu, 9/7/09, Les Harris <leslieharris@optushome.com.au> wrote:

From: Les Harris <leslieharris@optushome.com.au>

Subject: [Syncro_T3_Australia] Re: Tyre Pressures
To: Syncro_T3_Australia@yahoogroups.com
Received: Thursday, 9 July, 2009, 8:35 PM

Tony,

Yes, that is correct but that does not in turn suggest that they tyre pressures front and rear should be the same. They should be as per the placard. I am trying to post a picture of the tyre placard but the current Yahoo outage is blocking me. I will send it to your email address.

Les


--- In Syncro_T3_Australia @yahoogroups. com, "Tony" <ricketts.tony@ ...> wrote:
>
> Les,
>
> The reason I am asking is that someone told me that if my tyre pressures are different, say if one tyre deflates over time, then the viscous coupler will operate ? I just wondered if this is correct?
>
> Tony
>
>
> ----- Original Message -----
> From: Les Harris
> To: Syncro_T3_Australia @yahoogroups. com
> Sent: Thursday, July 09, 2009 4:06 PM
> Subject: [Syncro_T3_Australi a] Tyre Pressures
>
>
>
>
>
>
> Tony,
>
> On the driver's door frame is a placard telling you what tyre pressures to use. Follow it!
>
> Les
>

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10
The earlier request may have been made  a bit redundant by subsequent commentary but for the records I've photographed the 2 official VW stickers on my car for its 14" and
16" rims.The later was obtained by my original owner when he purchased 6 genuine VW
16" rims.

Sorry about the quality, its an awkward place to photograph with the reflections from the
foil stickers.
Cheers
Roger 


--- On Thu, 9/7/09, Les Harris <leslieharris@optushome.com.au> wrote:

From: Les Harris <leslieharris@optushome.com.au>
Subject: [Syncro_T3_Australia] Tyre Pressures
To: Syncro_T3_Australia@yahoogroups.com
Received: Thursday, 9 July, 2009, 4:06 PM

Tony,

 On the driver's door frame is a placard telling you what tyre pressures to use.  Follow it!

 Les

 


Access Yahoo!7 Mail on your mobile. Anytime. Anywhere. Show me how.