[Biturbos4] Tire Recomendation? and possible tire for sa le.

[Russell Romano]

Not to start a huge tire physics debate...

But my understanding is that a tire's contact patch is a direct relationship of the weight on that tire and the pressure in the tire.

For small changes in tire width (which is all our Audi's can really tolerate) you change the length of the contact patch proportionally as the width is fixed by the tire width and the area is fixed by the weight of the car and the tire pressure.

My only concern about running the tires at the stock pressures is that the shape this contact patch area creates for the new tire may not what the tire manufacturer expects.  This could result in bad tire wear.

The manufacturers should really recommend tire pressures for specific loading weights to keep the tire inflated sufficiently to hold its designed shape.

To go back to the original question... I don't think there is a quantifiable relationship between tire size and recommended pressure.  It would depend on the design of the tire in question more than it's actual size.

-Russ




-----Original Message-----
From: Quincy Chiang [mailto:b5quattro at shaw.ca]
Sent: Thursday, August 26, 2004 2:51 PM
To: Yu-tai Chung
Cc: Russell Romano; biturbos4 at audifans.com
Subject: Re: RE: [Biturbos4] Tire Recomendation? and possible tire for
sale.


I just follow the recommended pressures on the sticker inside the fuel door.  For the B5-A4/S4, I believe the recommended pressures are between 36-42 psi depending on load for 225/45-17 size.  I usually run 40 front and 28 rear with me in it most of the time.

Quincy

----- Original Message -----
From: Yu-tai Chung <yxc165 at psu.edu>
Date: Thursday, August 26, 2004 8:48 am
Subject: RE: [Biturbos4] Tire Recomendation?  and possible tire for sale.

> As the wheels get larger, what should the pressure be? For A6 16" they
> recommend 205 should be around 37PSI? But the 215 they recommended 
> 34PSI for
> 3 people.. does that sound right? Then the 225 would be less? 
> 
> Is there a chart to figuring this stuff out? 
> 
> -----Original Message-----
> From: biturbos4-bounces at audifans.com [biturbos4-bounces at audifans.com]
> On Behalf Of Russell Romano
> Sent: Wednesday, August 25, 2004 5:29 PM
> To: Biturbos4 at audifans.com
> Subject: RE: [Biturbos4] Tire Recomendation? and possible tire for 
> sale.
> You may want to consider the Toyo Proxes 4 as well.  I got them 
> for my A6
> when I put my 18" OZ's on.  Even in 245/40R18 they were about $140 
> per tire.
> That's not cheap, but it isn't ridiculous either.
> 
> I've been pretty happy with the road noise and the tire wear is 
> respectablefor a performance tire.
> 
> -Russ
> 
> 
> -----Original Message-----
> From: Nicholas Mistry [nick at mistry.com]
> Sent: Wednesday, August 25, 2004 4:59 PM
> To: Biturbos4 at audifans.com
> Subject: [Biturbos4] Tire Recomendation? and possible tire for sale.
> 
> 
> I have finally gotten tired of listening to my Stock Pirelli 
> P6000's and 
> am looking for some new shoes for my '01 B5 S4.  Right now i am 
> having a 
> hard time deciding, because i have no experience w/ any on my list.
> 
> As with most of the S4 drivers, I use my S4 as my daily driver.  
> My 
> driving style is quite spirited.  Wet & Dry Performance is 
> extremely 
> important, as well as LOW ROAD NOISE.  Also, these tires will 
> never see 
> a track or snow.
> 
> So, here is my list, all 225/45-17(in order of my preference):
> 1. Goodyear Eagle F1 GS-D3
> 2. Michelin Pilot Sport PS2
> 3. Michelin Pilot Sport
> 4.  Kumho Ecsta MX  ( friend's recommendation b/c of $)
> 
> What I would like to know, do any of you have experience w/ any of 
> these 
> tires?  If so what type of experience have you had in terms of 
> performance, wet traction, and road noise?     Are there any 
> others that 
> people can highly recommend?  
> 
> Now for the for sale part.  I have one (unfortunately) mounted 
> P6000 
> 225/45YR17 with < 1 miles on it. One of my in law's gardeners 
> damaged 
> one of my tires and I got a free one out of it.  My inlaws had the 
> new 
> tire mounted b/c i was traveling when the incident happened.  
> Anyways, 
> the tire still has the little spikes on it, and is still in BRAND 
> NEW 
> condition.   It now sits as my spare.
> 
> When I get the new set of tires, I will most likely sell this 
> tire, or 
> keep it for the spare.  I am happy to email pictures if you are 
> interested.   The tire is located in San Antonio, TX (78233).   If 
> you 
> are interested, please contact me via email.
> 
> Thanks!
> 
> -N
> 
> 
> 
> 
> 
> 
> 
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