| Author |
Message |
AustinMini.OsiTech.Net
Guest
|
 Posted:
Sun Dec 26, 2004 4:43 pm Post subject:
Re: A4 tyres |
|
|
Not true.
MY 01 came with 15"s stock.
I have since replaced them with 18s thank you very much.
http://AudiA4.OsiTech.Net
--
_________________________________
http://austinmini.ositech.net
Looking for cheap Austin Mini, Wagon, Clubman, Mokes and other variants for
sale in the USA.
"Pete" <escape2music@hotmail.com> wrote in message
news:cqm7gh$3fj$1@news.onet.pl...
| Quote: |
"Glenn Richards" wrote
I have a 2001 A4 1.9TDi (the 130 engine), currently fitted with 205/55
tyres. According to my calculations, I should be able to fit 225/50 tyres
on the 16" alloys without affecting the circumference - I probably have
around 5,000 miles left on the existing tyres.
So - will the standard 16" alloy rims take a 225/50 profile, or would
this be too wide for the rim.
FYI... the A4s sold in the US come with 215/55/16 tires standard mounted
on 16x7 rims. You might want to try that.
Cheers,
Pete
|
|
|
| Back to top |
|
 |
Pete
Guest
|
| Posted:
Sun Dec 26, 2004 5:05 pm Post subject:
Re: A4 tyres |
|
|
"AustinMini.OsiTech.Net" wrote
| Quote: | Not true.
MY 01 came with 15"s stock.
|
In the US, the B6 A4 3.0 came with 16" stock. On other versions (1.8T)
it was an option, as was 17".
By "standard" I meant that this particular size I mentioned
(215/55/16x7) was offered by Audi itself, so it definitely works.
Cheers,
Pete |
|
| Back to top |
|
|
Dan Koren
Guest
|
| Posted:
Sun Dec 26, 2004 5:11 pm Post subject:
Re: A4 tyres |
|
|
"Pete" <escape2music@hotmail.com> wrote in message
news:cqm7gh$3fj$1@news.onet.pl...
| Quote: |
"Glenn Richards" wrote
I have a 2001 A4 1.9TDi (the 130 engine), currently fitted with 205/55
tyres. According to my calculations, I should be able to fit 225/50
tyres on the 16" alloys without affecting the circumference - I
probably have around 5,000 miles left on the existing tyres.
So - will the standard 16" alloy rims take a 225/50 profile, or would
this be too wide for the rim.
FYI... the A4s sold in the US come with 215/55/16 tires standard mounted
on 16x7 rims. You might want to try that.
|
Your info is out of date.
That was true of pre-2003
A4's.
All current (and 2003-2004)
A4's come with 17" rims.
dk
|
|
| Back to top |
|
|
Pete
Guest
|
|
| Back to top |
|
|
Jeff C
Guest
|
| Posted:
Mon Dec 27, 2004 12:07 am Post subject:
Re: A4 tyres |
|
|
On Sun, 26 Dec 2004 09:23:52 +0000, Glenn Richards
<glenn@squirrelsolutions.co.uk> wrote:
| Quote: | Glenn Richards wrote:
this classic holiday feast.
Actually no I didn't. I've seen a number of these, someone is forging
posts from myself and a number of other posters to alt.autos.audi with a
large amount of crossposting.
Headers saved for reference...
|
That was a forged post by a USENET vandal known as "hipcrime". Dippy
hates USENET, and especially it hates news.admin.net-abuse.email, so
it wrote a piece of abuseware known as "newsagent" that allows it to
forge supercede posts and force follow-ups to flood NANAE with
thousands of "WTF" posts such as yours.
What to do about it is simple. First, look at the headers of a few
forged posts, and filter on the commonly identifiable elements. Lately
dipy's been abusing news servers in northern Europe. If you subscribe
to a service such as Supernews, the filtering is already done for you.
Second, if you feel you NUST reply to a dippyspew post, look very
carefully at where the post will be sent before you send it. This will
ensure that you don't accidentally pollute another group thus doing
dippy's vandalism for it. Third, now that you're immune to this id10t,
join in the defense by posting a message similar to this one whenever
you see a dippyspew in your newsgroup. The more people who know about
dippy, the less damage it can do. |
|
| Back to top |
|
|
Dan Koren
Guest
|
| Posted:
Mon Dec 27, 2004 12:56 am Post subject:
Re: A4 tyres |
|
|
"Pete" <escape2music@hotmail.com> wrote in message
news:cqmcqr$q5v$1@news.onet.pl...
You made my point exactly.
All the above links are to Audi's world site,
not to the US site -- that is www.audiusa.com.
Also note that the fact that a car will allow
a certain rim/wheel size does not mean it will
perform or handle well with that wheel.
dk |
|
| Back to top |
|
|
Pete
Guest
|
| Posted:
Mon Dec 27, 2004 4:45 am Post subject:
Re: A4 tyres |
|
|
"Dan Koren"
| Quote: | You made my point exactly.
All the above links are to Audi's world site,
not to the US site -- that is www.audiusa.com
|
Audiworld is a US-centered site and the specs they publish are for
US-based models. Besides, www.audiusa.com shows the same info: 16"
stock and 17" optional for 2004.
| Quote: | Also note that the fact that a car will allow
a certain rim/wheel size does not mean it will
perform or handle well with that wheel.
|
That's true, but the definition of "handling" varies depending on the
individual. For some it's firm/crisp steering response; for others it's
ride comfort. We don't know what the original poster's priorities are.
If he wants the former, he should buy himself 19" rims with 235/35/19
tires. If he wants the latter - he should stick with what he has or
even downgrade to 15s.
Cheers,
Pete |
|
| Back to top |
|
|
Glenn Richards
Guest
|
| Posted:
Mon Dec 27, 2004 12:59 pm Post subject:
Re: A4 tyres |
|
|
Pete wrote:
| Quote: | Audiworld is a US-centered site and the specs they publish are for
US-based models. Besides, www.audiusa.com shows the same info: 16"
stock and 17" optional for 2004.
|
I'm based in the UK - stock wheels are 16".
| Quote: | Also note that the fact that a car will allow a certain rim/wheel
size does not mean it will perform or handle well with that wheel.
That's true, but the definition of "handling" varies depending on the
individual. For some it's firm/crisp steering response; for others
it's ride comfort. We don't know what the original poster's
priorities are. If he wants the former, he should buy himself 19"
rims with 235/35/19 tires. If he wants the latter - he should stick
with what he has or even downgrade to 15s.
|
Basically I want to be able to go round corners faster without the back
end starting to twitch. On a previous car (MkIII Fiesta) I upgraded
165/65R13s on steel rims to 185/50R14s on alloys, the difference was
quite remarkable. That car only had 60bhp-ish, and after the upgrade
didn't have enough power to slide round a corner!
The theory goes that the more rubber in contact with the tarmac the
better. As all the tyres on my A4 (2001 model) will need replacing in
about 5,000 miles, I wanted to know if it was possible to fit a 225/50
width tyre on the existing rims (currently 205/55). According to my
calculations, dropping to a 50 profile on the 225 will keep the sidewall
height, circumference etc the same, so the ride comfort (and the speedo
reading!) should stay the same, but with a bit more lateral grip round
corners.
--
Glenn Richards Tel: (01453) 845735
Squirrel Solutions http://www.squirrelsolutions.co.uk/
IT consultancy, hardware and software support, broadband installation |
|
| Back to top |
|
|
Dan Koren
Guest
|
| Posted:
Mon Dec 27, 2004 1:42 pm Post subject:
Re: A4 tyres |
|
|
"Glenn Richards" <glenn@squirrelsolutions.co.uk> wrote in message
news:3JOdnbFYafRHXVLcRVnyhw@eclipse.net.uk...
| Quote: |
Basically I want to be able to go round corners faster without the back
end starting to twitch. On a previous car (MkIII Fiesta) I upgraded
165/65R13s on steel rims to 185/50R14s on alloys, the difference was
quite remarkable. That car only had 60bhp-ish, and after the upgrade
didn't have enough power to slide round a corner!
The theory goes that the more rubber in contact with the tarmac the
better. As all the tyres on my A4 (2001 model) will need replacing in
about 5,000 miles, I wanted to know if it was possible to fit a 225/50
width tyre on the existing rims (currently 205/55). According to my
calculations, dropping to a 50 profile on the 225 will keep the sidewall
height, circumference etc the same, so the ride comfort (and the speedo
reading!) should stay the same, but with a bit more lateral grip round
corners.
|
Just upgrading the tyres/wheels one size is
not likely to buy you much better cornering
ability. The suspension also has something
to do with it! The stock A4 suspension is
pretty soft. If your goal is to noticeably
improve your A4's cornering ability, you
will probably need to tweak its suspension
as well.
dk |
|
| Back to top |
|
|
Glenn Richards
Guest
|
| Posted:
Mon Dec 27, 2004 9:07 pm Post subject:
Re: A4 tyres |
|
|
Dan Koren wrote:
| Quote: | Just upgrading the tyres/wheels one size is not likely to buy you
much better cornering ability. The suspension also has something to
do with it! The stock A4 suspension is pretty soft. If your goal is
to noticeably improve your A4's cornering ability, you will probably
need to tweak its suspension as well.
|
That's not a road I want to start going down. If I can fit the next size
up tyres on the existing rims, for another 10-15ukp per tyre it'll give
a small but worthwhile improvement. Otherwise I'll just stick with the
205/55 profile tyres when the current ones need replacing.
--
Glenn Richards Tel: (01453) 845735
Squirrel Solutions http://www.squirrelsolutions.co.uk/
IT consultancy, hardware and software support, broadband installation |
|
| Back to top |
|
|
Peter Bell
Guest
|
| Posted:
Tue Dec 28, 2004 12:40 am Post subject:
Re: A4 tyres |
|
|
In message <bIOdnY4IfNiirk3cRVnysQ@eclipse.net.uk>
Glenn Richards <glenn@squirrelsolutions.co.uk> wrote:
| Quote: | That's not a road I want to start going down. If I can fit the next size
up tyres on the existing rims, for another 10-15ukp per tyre it'll give
a small but worthwhile improvement.
|
I guess that the question which must be asked is - what improvement do
you expect to achieve?
Altering the width of a tyre does *not* achieve more rubber on the road,
it merely alters the shape of the 'footprint' - unless you are reducing
the inflation pressure, but you could do that with your existing tyres.
The actual area of tyre in contact with the road is a simple
relationship -
contact area = (weight carried by wheel)/(inflation pressure)
--
Peter Bell (Note Spamtrap - To reply, replace 'invalid' with 'bellfamily') |
|
| Back to top |
|
|
SteveH
Guest
|
| Posted:
Tue Dec 28, 2004 1:00 am Post subject:
Re: A4 tyres |
|
|
Peter Bell <peter@invalid.org.uk> wrote:
| Quote: | In message <bIOdnY4IfNiirk3cRVnysQ@eclipse.net.uk
Glenn Richards <glenn@squirrelsolutions.co.uk> wrote:
That's not a road I want to start going down. If I can fit the next size
up tyres on the existing rims, for another 10-15ukp per tyre it'll give
a small but worthwhile improvement.
I guess that the question which must be asked is - what improvement do
you expect to achieve?
Altering the width of a tyre does *not* achieve more rubber on the road,
it merely alters the shape of the 'footprint' - unless you are reducing
the inflation pressure, but you could do that with your existing tyres.
The actual area of tyre in contact with the road is a simple
relationship -
contact area = (weight carried by wheel)/(inflation pressure)
|
I'm obviously being a bit thick here, but could you please explain how
a, for example, a 185/60 tyre will put the same area of rubber down as a
220/45?
--
Steve H 'You're not a real petrolhead unless you've owned an Alfa Romeo'
http://www.italiancar.co.uk - Honda VFR800 - MZ ETZ300
VW Golf GL Cabrio - Alfa 75 TS - VW Passat 1.8T 20V SE - COSOC KOTL
BoTAFOT #87 - BoTAFOF #18 - MRO # - UKRMSBC #7 - Apostle #2 - YTC # |
|
| Back to top |
|
|
BillyRay
Guest
|
| Posted:
Tue Dec 28, 2004 3:14 am Post subject:
Re: A4 tyres |
|
|
The formula in a prior post will give you the contact area but makes no
reference to its shape or the tire's friction force. If your tire load
remains constant (the same car) a wider tire will have "wider" shape which
leads to greater lateral resistance to shift due to its shape alone.
The following equation is perhaps more accurate:
(friction force = (coeff of fric) x (summation of tire forces (Fx, Fy, Fz)
If you want to go around curves faster on dry pavement then a wider tire is
the way to go. You should be aware, however, that widening the tires will
lower the velocity at which flotation on wet or snowy surfaces occurs.
There is also the factor of changing the stress on wheel bearings by the
alteration of the "effective" offset. The change of one size wider and one
size lower profile will probably have a small effect on bearing stress.
More importantly is to make sure that the proposed lower profile will not
allow the tire sidewall to contact and suspension or brake component as it
flexes, jounces or rebounds. There is limited information on this due to the
relative rarity of Audis in the US.
Thirty two years ago when I began racing it was much easier as there was
always someone else that had tried a combination before and, by trial and
error, the acceptable sizes became known. If you wanted to exceed those
conventions we would alter suspension components. Changing the shackles on
leaf springs or "taking a torch" to coil springs were very common ways to
effect the suspension. We knew that this would alter the driving
characteristics but.... well... we were young and stupid, and didn't care.
But then... I wasn't a middle aged man driving a $45K vehicle either.
For what it is worth I have seriously considered going up one size and down
one width for my next set of tires... In my case I would replace 215-55-16
with 235-50-16. The speedometer error introduced would be approximately
+0.2%
"SteveH" <steve@italiancar.co.uk> wrote in message
news:1gpgy7a.1w3htv7no53ayN%steve@italiancar.co.uk...
| Quote: | Peter Bell <peter@invalid.org.uk> wrote:
In message <bIOdnY4IfNiirk3cRVnysQ@eclipse.net.uk
Glenn Richards <glenn@squirrelsolutions.co.uk> wrote:
That's not a road I want to start going down. If I can fit the next
size
up tyres on the existing rims, for another 10-15ukp per tyre it'll give
a small but worthwhile improvement.
I guess that the question which must be asked is - what improvement do
you expect to achieve?
Altering the width of a tyre does *not* achieve more rubber on the road,
it merely alters the shape of the 'footprint' - unless you are reducing
the inflation pressure, but you could do that with your existing tyres.
The actual area of tyre in contact with the road is a simple
relationship -
contact area = (weight carried by wheel)/(inflation pressure)
I'm obviously being a bit thick here, but could you please explain how
a, for example, a 185/60 tyre will put the same area of rubber down as a
220/45?
--
Steve H 'You're not a real petrolhead unless you've owned an Alfa Romeo'
http://www.italiancar.co.uk - Honda VFR800 - MZ ETZ300
VW Golf GL Cabrio - Alfa 75 TS - VW Passat 1.8T 20V SE - COSOC KOTL
BoTAFOT #87 - BoTAFOF #18 - MRO # - UKRMSBC #7 - Apostle #2 - YTC # |
|
|
| Back to top |
|
|
Dan Koren
Guest
|
| Posted:
Tue Dec 28, 2004 3:36 am Post subject:
Re: A4 tyres |
|
|
"BillyRay" <SPAMjpb357@yifan.net> wrote in message
news:aP%zd.13365$IZ2.13351@fe37.usenetserver.com...
| Quote: |
There is limited information on this due to the
relative rarity of Audis in the US.
|
Where in the US do you live?
At least 1/3 of the vehicles in the parking lot of the
company where I work are Audis. It is certainly the
single most popular marque around here...
dk |
|
| Back to top |
|
|
Peter Bell
Guest
|
| Posted:
Tue Dec 28, 2004 4:09 am Post subject:
Re: A4 tyres |
|
|
In message <1gpgy7a.1w3htv7no53ayN%steve@italiancar.co.uk>
steve@italiancar.co.uk (SteveH) wrote:
| Quote: | I'm obviously being a bit thick here, but could you please explain how
a, for example, a 185/60 tyre will put the same area of rubber down as a
220/45?
|
One will have a long thin footprint, the other will have ashort fat
footprint.
Think about it - it's the air in the tyres which supports the car, and
the force between the ground and the tyre provides that support. If
there is 500lbs weight bearing on one wheel, and the air pressure in
that tyre is 50lbs/sq.in., then it will take 10sq.in. of tyre surface to
take the weight, therefore the area of the contact patch will be
10sq.in. Whether that tyre is one inch wide, or ten inches wide, the
surface area in contact with the ground will still be 10sq.in.
--
Peter Bell (Note Spamtrap - To reply, replace 'invalid' with 'bellfamily') |
|
| Back to top |
|
|
|
|
|
|
FAQ
Memberlist
Register
Profile
Log in to check your private messages
Log in