18" rims (Full Version)

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18" rims

  

Audi A6 -> 18" rims (2/26/2008 10:02:02 AM)

I have a 2004 Audi A6 with 17" rims.  If I move up to an 18" rim, with this effect anything?  speedo, traction control, etc?


  
HiredGun -> RE: 18" rims (2/26/2008 12:12:22 PM)

I JUST switch my 04 2.7T SLine from 17s to 18s and there is a slight difference in how the car deals with rougher roads and bumps.  Since I kept the overall radius of the tires the same, the thinner tire does not take the hits as well.  However, when I upgraded I went from the Pirelli P6 to a Goodyear F1 all season.  The handling on the car is now remarkably better and smoother.  Also, I'm guessing that the shorter, stiffer tire wall reduces lateral motion resulting in a tighter feel.

It was definitely worth the upgrade IMO.  The handling and the looks are both improved for a very slight trade off in how the car takes the bumps.

To answer your specific questions, the speedometer should not be impacted if the radius of the tire remains the same.  Assuming the wheels fit properly (offset, clearance, etc), I don't see how traction control or anything else would be impacted by the update. 

ppgoal -> RE: 18" rims (2/26/2008 1:37:55 PM)

I run OEM 17" for the winter and Velocity 18" for the summer, Pirellis vs ContiExtremes.  No difference in speedo and they seem to fill the fenders the same.  I think the 18" may feel a little rougher as there is not as much sidewall to soak up bumps and pavement irregularities.

trapped -> RE: 18" rims (2/26/2008 3:14:30 PM)

Yeah you sent me the picture of the velocitys and they look great. At the end of summer i should have mine!

daroshi -> RE: 18" rims (2/26/2008 3:41:33 PM)

If you increase wheel size the sidewall height needs to be reduced accordingly. Use the handy tire size calculator in the attached link. It will compare the original size with the new tire dimensions and tell you what the speedometer error will be.
http://www.discounttire.com/dtcs/infoTireMath.dos


formulagigi -> RE: 18" rims (2/26/2008 4:11:19 PM)

all you need to do is go from a 235/45/17 tire to a 235/40/18 and you will keep overall diameter and revolution per mile within an acceptable percentage, typically under 3%
All tires are not equal in size/shape even within the same 235/40/18 size... I now have Goodyear F1 All Season and they are big, bigger than Khumos for example. They look great, handle real well on dry and wet roads and their sidewall looks a little **** b/c it is fairly square tire and it has a stiff tirewall. It also depends on the width of the rim. For example, a 8.5 will stretch it more than a 8" wide rim, which will give you a squarer tire and more tirewall. There is not that much difference b/w my 18s ans 17's, b ut you will lose a little comfort while gaining in handling with a shorter tire wall that flexes less. Especially the Goodyear F1 AS.

joetm -> RE: 18" rims (2/26/2008 4:58:53 PM)

I want to get 19s ... what tire size to you recommend and what offset do you recommend ?!

jojoampt -> RE: 18" rims (2/26/2008 5:11:26 PM)

as i understood it, the 45 in 235/45/17 is for the height correct? so then wouldnt a 235/45/18 be the same height as a 235/45/17? only the inner diameter should change. or am i an idiot, please feel free to point fingers and call names if so[:)]

joetm -> RE: 18" rims (2/28/2008 6:01:13 PM)

no u are right i would need a 235/35/19 but that is a thin ass tire ... maybe some run flats

formulagigi -> RE: 18" rims (2/28/2008 10:09:22 PM)

quote:

ORIGINAL: jojoampt

as i understood it, the 45 in 235/45/17 is for the height correct? so then wouldnt a 235/45/18 be the same height as a 235/45/17? only the inner diameter should change. or am i an idiot, please feel free to point fingers and call names if so[:)]


well it doesn't work this way, the tirewall size of 45 is a ratio of the width as in 45% of 235. So as you plus size (i.e. from 17" to 18" wheels), you want to drecrease your ratio # to decrease tire wall size and make up for the bigger diameter rim and therefore keep the overall height and diameter close to stock.

JOETM: if you ahve 235/45/17 stock, I recommend you get 235/35/19 or if you can fit them 245/35/19 to get a little more tirewall. As for offset,I guess it depends on the wheel but ET35 has worked well for me to get the wheels at the corners and clear brakes.

joetm -> RE: 18" rims (2/29/2008 5:29:28 AM)

thanks for the help .. i was playin around with that size calculator ... do you know any site that have a lot of good rims ... if im gonna buy a new set i wanna spend some good money and make it worth it !

formulagigi -> RE: 18" rims (2/29/2008 12:23:19 PM)

I use
www.gmpperformance.com
www.achtuning.com
www.tirerack.com

trapped -> RE: 18" rims (2/29/2008 3:46:39 PM)

Yeah GIGI how many sets of wheels do you have?

audia6s -> RE: 18" rims (3/1/2008 9:54:11 AM)

Which rims would you put on 06 A6? I am looking at 7 spoke RS4 wheels. Any suggestions? Thanks a lot

formulagigi -> RE: 18" rims (3/1/2008 11:16:56 AM)

quote:

ORIGINAL: trapped

Yeah GIGI how many sets of wheels do you have?



well I have two sets now, I sold my BBS RSGT's to an Audizine member last month.
I then bought the RS4 DTM wheels\

I still have my BBS R 17' which I had redone ($350) last month and dneed to sell. They are great strong and light wheels that Audi dealers sell for 560 each :)


trapped -> RE: 18" rims (3/1/2008 12:43:33 PM)

Ohh, Nice i though you had 3 plus the sock wheels, I found some 18" hartmann DTM's on ACHTUNING and am thinking about picking them up soon. I think ill do wheels then lower it later.

formulagigi -> RE: 18" rims (3/1/2008 6:47:28 PM)

wait to get the hartmann, GB should this week but GMPPerformance will do free shipping on them this week.

audia6s -> RE: 18" rims (3/3/2008 3:34:42 PM)

http://www.purems.com/products/product.php?II=2313

I am looking to buy this for my A6. Any comments, feedback? Thanks

trapped -> RE: 18" rims (3/3/2008 4:31:54 PM)

Yes, thoes wheels look pretty good, IMHO the Hartmann Dtm's or RS6 wheels look slightly better, but are also more expensive. I will most likley pick some of thoes up.

I need an opinion. Does anyone think that a Silver A6 would look good with the Black or Gunmettal wheels? I don't want it to look gangster, but i want the wheels to be prominate. Imput would be greatly appreciated

audia6s -> RE: 18" rims (3/3/2008 6:21:42 PM)

I dont think black or gunmetal will look nice but thats my opinion. Hypersilver will look good.

audia6s -> RE: 18" rims (3/3/2008 6:23:35 PM)

Is this the correct tire size for RS4 wheels on A6? 245-40-18

Is there any other site to buy tires? I already looked at tirerack and discounttires. Thanks

formulagigi -> RE: 18" rims (3/3/2008 6:49:59 PM)

quote:

ORIGINAL: audia6s

http://www.purems.com/products/product.php?II=2313

I am looking to buy this for my A6. Any comments, feedback? Thanks


A member on this forum has them on his A6. They look good but the Hartmann DTM and RS6 look better IMO. Also these are made in CHina if i remember correctly whereas the HArtmann are made in Europe, typically by one of the 4 big german maker such as RH.


formulagigi -> RE: 18" rims (3/3/2008 6:50:44 PM)

quote:

ORIGINAL: trapped

Yes, thoes wheels look pretty good, IMHO the Hartmann Dtm's or RS6 wheels look slightly better, but are also more expensive. I will most likley pick some of thoes up.

I need an opinion. Does anyone think that a Silver A6 would look good with the Black or Gunmettal wheels? I don't want it to look gangster, but i want the wheels to be prominate. Imput would be greatly appreciated



Gunmetal or Anthracite will look good. I would avoid black

formulagigi -> RE: 18" rims (3/3/2008 6:52:45 PM)

quote:

ORIGINAL: audia6s

Is this the correct tire size for RS4 wheels on A6? 245-40-18

Is there any other site to buy tires? I already looked at tirerack and discounttires. Thanks


For the 2.7T, the correct size would be 235/45/17 or 235/40/18 or 235/35/19.. but some (like me before on my RSGT's) go for 245 keeping the same wall ratio to get a litle extra tire wall protection/comfort.
You may be ok but some tire/wheel set up might prove to big and rub in 245 if lowered


audia6s -> RE: 18" rims (3/4/2008 10:27:40 AM)

Tires plus and tire rack recommend following tire size for 2006 Audi A6...245/40/18. I have 17 right now and would like to know if this is the right size. I am conerned about clearence and offset and would like to make sure that the ET42 velocity tires from

http://www.purems.com/products/product.php?II=2313

This wont cause any issue with the drive etc. and also, will fit in just like a factory wheel and tire. Thanks a lot

  

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