18" rims
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18" rims - 2/26/2008 10:02:02 AM
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Audi A6
Posts: 2
Joined: 2/26/2008
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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?
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RE: 18" rims - 2/26/2008 12:12:22 PM
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HiredGun
Posts: 20
Joined: 1/8/2008
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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.
< Message edited by HiredGun -- 2/26/2008 12:20:57 PM >
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RE: 18" rims - 2/26/2008 1:37:55 PM
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ppgoal
Posts: 701
Joined: 9/8/2006
From: Holland MI
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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.
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2003 Audi A6 2.7T MT6
Premium Package-Cold Weather Package-Bose
GIAC-Bailey DVs-Samco TBB
AWE Stage 2 Clutch+Lightweight Flywheel
235/45 R17 Pirelli P6 All-season; OEMs
235/40 ZR18 ContiExtremeContact;
Velocity RS4 Replica Rims
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RE: 18" rims - 2/26/2008 3:41:33 PM
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daroshi
Posts: 168
Joined: 9/6/2006
From: WA
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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
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2002 A6 2.7T 6MT
Crystal Blue
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RE: 18" rims - 2/26/2008 4:11:19 PM
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formulagigi
Posts: 1128
Joined: 4/23/2007
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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.
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2004 A6 Stg 2+ and 99 TJ...mod
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RE: 18" rims - 2/26/2008 4:58:53 PM
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joetm
Posts: 765
Joined: 1/6/2008
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I want to get 19s ... what tire size to you recommend and what offset do you recommend ?!
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-Joe
2002 a6 2.7t / GIAC / REMUS / AWE-Tuning s-flo intake / bailey's DVs / vast stage 3 tip chip /vast piggies / obx manifolds / k04's and rs4 ecu platform to come soon!
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RE: 18" rims - 2/28/2008 6:01:13 PM
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joetm
Posts: 765
Joined: 1/6/2008
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no u are right i would need a 235/35/19 but that is a thin ass tire ... maybe some run flats
_____________________________
-Joe
2002 a6 2.7t / GIAC / REMUS / AWE-Tuning s-flo intake / bailey's DVs / vast stage 3 tip chip /vast piggies / obx manifolds / k04's and rs4 ecu platform to come soon!
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RE: 18" rims - 2/28/2008 10:09:22 PM
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formulagigi
Posts: 1128
Joined: 4/23/2007
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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.
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2004 A6 Stg 2+ and 99 TJ...mod
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RE: 18" rims - 2/29/2008 5:29:28 AM
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joetm
Posts: 765
Joined: 1/6/2008
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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 !
_____________________________
-Joe
2002 a6 2.7t / GIAC / REMUS / AWE-Tuning s-flo intake / bailey's DVs / vast stage 3 tip chip /vast piggies / obx manifolds / k04's and rs4 ecu platform to come soon!
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