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View Full Version : Guys with 18s, help me out with some tire sizes please



.Mad Hatter.
11-05-2010, 02:02 AM
Looks like a wheel trade for my RFs is pending, and I am going up an inch.

The wheels are 18x8.5 front, and 18x9 rear. The seller thinks the offset of both is 35, but I asked him to measure.

Question is, what tire sizes do you guys suggest/what are you running? I am about 23.5" GTF with my 17x8.5s and 215/40/17s. Do you rub with your current setup, and how do you find the stagger?

I'm thinking either a 205 or 215/40 in the front, and a 215 or 225/40 in the rear.

Shot of the car as is on the above mentioned setup. I have trimmed my summer fender liners and my fenders are slightly trimmed, but i DO NOT at all want to rub, and ideally I would like to not have to touch the coils.

http://farm2.static.flickr.com/1209/5117937165_3d488d0cd5_b.jpg

Pics would be great, thanks guys.

PS- hint on the new wheels=
http://c1.ac-images.myspacecdn.com/images01/46/m_15fb63824430402f57b9a8fffe4bb458.jpg

[>_<]

austinjmiller
11-05-2010, 03:52 AM
I have 18's that came on the car that are 18x8.5 all around not sure on the off set but theres 245/40/R18 and there's no rub.... I do drive a B6 but still that tires big and even my friends wife's B5 has stock S4 rims with 325/30/18s? and its lowered and no rub either!

.Mad Hatter.
11-05-2010, 04:03 AM
I would 100% rub with that setup, lol. Is your car lowered?

wpkaudi
11-05-2010, 06:00 AM
Looks like a wheel trade for my RFs is pending, and I am going up an inch.

The wheels are 18x8.5 front, and 18x9 rear. The seller thinks the offset of both is 35, but I asked him to measure.

Question is, what tire sizes do you guys suggest/what are you running? I am about 23.5" GTF with my 17x8.5s and 215/40/17s. Do you rub with your current setup, and how do you find the stagger?

I'm thinking either a 205 or 215/40 in the front, and a 215 or 225/40 in the rear.

Shot of the car as is on the above mentioned setup. I have trimmed my summer fender liners and my fenders are slightly trimmed, but i DO NOT at all want to rub, and ideally I would like to not have to touch the coils.

http://farm2.static.flickr.com/1209/5117937165_3d488d0cd5_b.jpg

Pics would be great, thanks guys.

PS- hint on the new wheels=
http://c1.ac-images.myspacecdn.com/images01/46/m_15fb63824430402f57b9a8fffe4bb458.jpg

[>_<]

ok... I am 24 1/4 to the top of my fenders. Slight tuck. 225/40 is what is on my 18" reps. I believe 8 wide. Don't know the offset. I had to roll my fenders. I got the fender real hot, if not hot enough the paint just cracks and chips. I got it hot enough that the metal was soft. Then just tapped the horizontal inner part of the fender with a rubber mallet until flat against inner fender. Now I can lock to lock no rub. Aggressive driving no rub. Slow sharp bumpy turn sometimes rub. Don't know if I need to cut more liner or if its fender. For the most part no stress.

wpkaudi
11-05-2010, 06:03 AM
I have 18's that came on the car that are 18x8.5 all around not sure on the off set but theres 245/40/R18 and there's no rub.... I do drive a B6 but still that tires big and even my friends wife's B5 has stock S4 rims with 325/30/18s? and its lowered and no rub either!

Yah I keep reading about people on 235 plus with wider than 8" rims and scratch my head. Maybe need to pull me fenders to idk.

.Mad Hatter.
11-05-2010, 06:05 AM
I have rolled fenders before and would really prefer to avoid it all together if possible.

I am sort of leaning toward a 205/40 front and a 215/40 rear...or 215/40 all around.

wpkaudi
11-05-2010, 06:07 AM
I have rolled fenders before and would really prefer to avoid it all together if possible.

I am sort of leaning toward a 205/40 front and a 215/40 rear...or 215/40 all around.

are they hammered flat? I think those sizes are a bit anemic.

somebody5788
11-05-2010, 06:09 AM
I have 18's that came on the car that are 18x8.5 all around not sure on the off set but theres 245/40/R18 and there's no rub.... I do drive a B6 but still that tires big and even my friends wife's B5 has stock S4 rims with 325/30/18s? and its lowered and no rub either!

B6's have a lot more room for tires. I doubt its 325 but thats probably a typo? 235/40/18 can fit with extremely limited rubbing depending how low you go. a 235/30/18 would be REALLY short.... like < 1.5" of tire.

.Mad Hatter.
11-05-2010, 06:09 AM
keep in mind the car is a full inch lower than where yours is...

my current fenders have been trimmed and the liners have been trimmed as well right at the top of the arch. they would be hard to get flat because now that i have trimmed them there is less material to work with in the way of rolling of flattening. not to mention that the fenders were just shaved and painted 4 months ago...if i ruined them i would be pissed.

wpkaudi
11-05-2010, 06:10 AM
are they hammered flat? I think those sizes are a bit anemic.

lol yah well your car. I think i would have to have the fenders pulled in the rear. I would have to see a front shot of the car. Idk maybe the stance will still be good.

wpkaudi
11-05-2010, 06:22 AM
keep in mind the car is a full inch lower than where yours is...

my current fenders have been trimmed and the liners have been trimmed as well right at the top of the arch. they would be hard to get flat because now that i have trimmed them there is less material to work with in the way of rolling of flattening. not to mention that the fenders were just shaved and painted 4 months ago...if i ruined them i would be pissed.

if you look at the wheel thread most are 225 something on our cars. If you get the fender hot enough the metal is so soft. Your rims are wider than mine. My rears just clear with no rubbing. Staggering is not really good for awd.....

wpkaudi
11-05-2010, 06:26 AM
B6's have a lot more room for tires. I doubt its 325 but thats probably a typo? 235/40/18 can fit with extremely limited rubbing depending how low you go. a 235/30/18 would be REALLY short.... like < 1.5" of tire.

my tape measure says 24 1/4, it sits low idk how he is almost an inch lower. cops squat down now to talk to me at the window.

wpkaudi
11-05-2010, 06:28 AM
Looks like a wheel trade for my RFs is pending, and I am going up an inch.

The wheels are 18x8.5 front, and 18x9 rear. The seller thinks the offset of both is 35, but I asked him to measure.

Question is, what tire sizes do you guys suggest/what are you running? I am about 23.5" GTF with my 17x8.5s and 215/40/17s. Do you rub with your current setup, and how do you find the stagger?

I'm thinking either a 205 or 215/40 in the front, and a 215 or 225/40 in the rear.

Shot of the car as is on the above mentioned setup. I have trimmed my summer fender liners and my fenders are slightly trimmed, but i DO NOT at all want to rub, and ideally I would like to not have to touch the coils.

http://farm2.static.flickr.com/1209/5117937165_3d488d0cd5_b.jpg

Pics would be great, thanks guys.

PS- hint on the new wheels=
http://c1.ac-images.myspacecdn.com/images01/46/m_15fb63824430402f57b9a8fffe4bb458.jpg

[>_<]

ooooh ooooh I got it. The rims are an inch bigger so they are going to ride higher inside your fenders so just raise the car up a little. oh uhm yah search button 225/?? good luck lol

EErie B6
11-05-2010, 06:29 AM
if you look at the wheel thread most are 225 something on our cars. If you get the fender hot enough the metal is so soft. Your rims are wider than mine. My rears just clear with no rubbing. Staggering is not really good for awd.....


^staggering does not hurt AWD at all. you just need to keep your overall diameter the same (or close) front to back

wpkaudi
11-05-2010, 06:50 AM
^staggering does not hurt AWD at all. you just need to keep your overall diameter the same (or close) front to back

ok. staggering "WILL" effect transfer case and differential speeds. So the rear wheels move at a different rpm as front. Also these cars are prone to understeer and staggering will amplify that effect. Any hoot just my 2 cents. Maybe It won't hurt but its not great.

wpkaudi
11-05-2010, 06:54 AM
^staggering does not hurt AWD at all. you just need to keep your overall diameter the same (or close) front to back

staggering causes different rpms to transfer case and differentials. Also causes understeer on a car already prone to understeer. Those are fact. Maybe won't hurt but may not be great on the drivetrain in the long run on an older car.

biketsai
11-05-2010, 07:06 AM
I run 18x8.5 all around with 235-40. It fits perfect in the front, touches the plastic liner every now and then when entering driveways. It barely squeezes the same tire in the back with that control arm. That 9" rear might be long enough to stretch a 235 out to make it not as tall, but in the end it comes down to offset. Mine is 35

Hope that helps. I'm also about 24.5 gtf

danphines
11-05-2010, 07:21 AM
I run BBS RC's 18x8.5 ET32. Tires are 235/40/18. They rub the fenders over bumpy roads. If you have rolled fenders it will be no problem.

.Mad Hatter.
11-05-2010, 07:37 AM
I run 18x8.5 all around with 235-40. It fits perfect in the front, touches the plastic liner every now and then when entering driveways. It barely squeezes the same tire in the back with that control arm. That 9" rear might be long enough to stretch a 235 out to make it not as tall, but in the end it comes down to offset. Mine is 35

Hope that helps. I'm also about 24.5 gtf

With these wheels my GTF should be something like 23.75" front and 24.25" rear, which will help me avoid scraping, lol. The rear is not an issue, I have a 17x8.5 there now and there is room to space it out probably 12-15mm to make it flush. The 9" rear would only add 6mm to the inside and I have that clearance now with my current tires. a 215/40 on an 18 is just as wide as they are on my 17s, so that should be fine.

Fender rolling is my last resort, raising the coils is my second last resort. I have no problem running a 215 or even a 205/40 but I just curious to see how it looks.


ooooh ooooh I got it. The rims are an inch bigger so they are going to ride higher inside your fenders so just raise the car up a little. oh uhm yah search button 225/?? good luck lol

The wheel is an inch bigger, so it will sit .5" further in the fender assuming the tire sizes are the same. Search button for what? I am not going to run 225s.


ok. staggering "WILL" effect transfer case and differential speeds. So the rear wheels move at a different rpm as front. Also these cars are prone to understeer and staggering will amplify that effect. Any hoot just my 2 cents. Maybe It won't hurt but its not great.

This point is moot, the stagger thing has been talked about many times and guys are running setups weith over an inch of width difference...these are only .5". Not to mention the quattro system seems to be fine within 3% difference in size (total diameter), if I run 215/40s front and rear, it will be the same, if I run 205/40s and 215/40s it's something like 1.5%...

.Mad Hatter.
11-05-2010, 07:38 AM
Why does everyone keep suggesting 225 and 235s? LOL. I have made it clear I am not interested in those sizes, they will not see the new wheels on this car.

stack
11-05-2010, 07:55 AM
i had 215/35/18
on 8.5 and 9.0 rims.
stretched and staggered. looks awesome. but my tierods failed in a month. sucks on potholes

so then i bought pirelli 235/45/18. didnt fit at all.
gave them back got kumho 225/40/18 i am lowered 2inches with H and R race.


215 on 9" rear is going to be awesome.
no sidewall play at all.
here are some pics


http://img340.imageshack.us/img340/2924/img5332wf.jpg (http://img340.imageshack.us/i/img5332wf.jpg/)
http://img213.imageshack.us/img213/4863/img5022uw.jpg (http://img213.imageshack.us/i/img5022uw.jpg/)

.Mad Hatter.
11-05-2010, 07:59 AM
finally some pictures! lol thank you. i am sort of leaning toward either 215/40 all around or 215/40 in the front and 225/40 in the rear.

stack
11-05-2010, 08:10 AM
finally some pictures! lol thank you. i am sort of leaning toward either 215/40 all around or 215/40 in the front and 225/40 in the rear.

yes 215 in front 225 in rear. but you wont see a lip that much with 225

and make sure you dont leak air.
i was driving in the parking lot took a corner fast because i thought i was at a autoX and i had 15 psi in my tire.... tire just came off.

and when you turn with stretched tires you can hear and feel the side wall on the road

Lazer Viking
11-05-2010, 08:30 AM
when i get new tires i will be going 205/40 and 215/40.. i feel its a good compromise

.Mad Hatter.
11-05-2010, 09:04 AM
Nic you have 8 front and 9 rear or 8.5 front and 9.5 rear?

bbkid43
11-05-2010, 10:05 AM
205 and 215! or 215 all the way around

wpkaudi
11-05-2010, 10:20 AM
i had 215/35/18
on 8.5 and 9.0 rims.
stretched and staggered. looks awesome. but my tierods failed in a month. sucks on potholes

so then i bought pirelli 235/45/18. didnt fit at all.
gave them back got kumho 225/40/18 i am lowered 2inches with H and R race.


215 on 9" rear is going to be awesome.
no sidewall play at all.
here are some pics


http://img340.imageshack.us/img340/2924/img5332wf.jpg (http://img340.imageshack.us/i/img5332wf.jpg/)
http://img213.imageshack.us/img213/4863/img5022uw.jpg (http://img213.imageshack.us/i/img5022uw.jpg/)

I have the same rims,tires, suspension and car as you except mine is 01. Weird that you needed spacers. Mine a practically flush and idk if my tires would clear the rear fender. Any hoot I just drove 50 miles of 25mph twisty back roads, no rubbing and my stomach still hurts. I really enjoy the setup. Lol.

EErie B6
11-05-2010, 10:24 AM
205 and 215 should give you the closest thing to an equal stretch front to rear.
9" - 8.5" = .5" = 12.7mm
215mm - 205mm = 10mm

if you run the same size (215s) front and rear, id think the front tires would end up looking a little "meatier" due to having less stretch.

.Mad Hatter.
11-05-2010, 11:37 AM
the fronts would look like mine now...which isnt too meaty at all...im still on the fence.

NEED MORE PICS!

EErie B6
11-05-2010, 11:56 AM
compared to a rear thats stretched more it will.... i didnt mean meaty in general

aledelic42
11-05-2010, 12:22 PM
without any personal experience, I'd say 205/40 f and 215/40 r. the diameters are close enough that it shouldn't be a problem with quattro and they aren't too much smaller than stock. 205/40/18 is ~.4" smaller and 215/40/18 is ~.1" smaller than stock 205/55/16 and 225/40/18 is ~.3" larger than stock. I guess the amount of stretch depends on the way the sidewalls are of the brand tire but it should be a good looking amount..

205/40 on an 8.5J
http://www.tyrestretch.com/zp-core/i.php?a=8.5_205_40_R17&i=8.5_205_40_R17_Fuzion_HRi.jpg&s=595&cw=&ch=&q=85

215/40 on a 9J
http://www.tyrestretch.com/zp-core/i.php?a=9_215_40_R17&i=9_215_40_R17_Falken_512_3.jpg&s=595&cw=&ch=&q=85

also, you should post the offsets to figure out rubbing issues

.Mad Hatter.
11-05-2010, 12:23 PM
ya, im trying to find a shot of a given tire size on all 4 corners but with .5" difference in width, lol. its either going to be 215/40 all around, a la:

http://i242.photobucket.com/albums/ff207/AuntieH/treffen4.jpg
http://i242.photobucket.com/albums/ff207/AuntieH/julycar001.jpg

or 225/40 on the rear.

Brad is at about the same height I plan to be, and those are 8.5s all around. So my fronts will look like that and I'm thinking 225/40 rear, with a difference of 1.24%...not bad.

.Mad Hatter.
11-05-2010, 12:27 PM
205s sort of scare me...not really, but having 215s on an 8.5 I think its the narrowest I would want to go.

225s on a 9, Keiths car?

http://www.tyrestretch.com/zp-core/i.php?a=9_225_40_R18&i=9_225_40_R18_Falken_452_2.jpg&s=595&cw=&ch=&q=85

Lazer Viking
11-05-2010, 12:38 PM
its a 40 series tire though, so it will have more sidewall

yes mine are 8's and 9's w/ 215/35 all around.. the rear is stretched decently.. and the front is, well not at all

i think the tires that kieth was running looked like that because of the squared off tread, nah mean ?

.Mad Hatter.
11-05-2010, 12:41 PM
yea. what do you mean about a 40 series tire though? my tires now are 40s, just on a 17. Nic any chance you have some closer shots of each wheel/tire so I can see how different the stretch is (I know theyre not the same sizes as mine, just curious)

Lazer Viking
11-05-2010, 12:42 PM
front http://www.flickr.com/photos/lazer_viking/5127376130/sizes/o/in/photostream/
rear http://www.flickr.com/photos/lazer_viking/5127374244/sizes/o/in/photostream/

.Mad Hatter.
11-05-2010, 12:50 PM
thanks dude...do you think it looks goofy? i dont really think its too bad to be honest.

Lazer Viking
11-05-2010, 01:04 PM
yea i do.. i dont particularly care for the stretch/no stretch thing

oh, and i rub like a mother******

.Mad Hatter.
11-05-2010, 01:10 PM
youre like 1.5" lower than i would be, with lower offsets, haha

Lazer Viking
11-05-2010, 01:27 PM
true

Lelix
11-05-2010, 04:34 PM
205s sort of scare me...not really, but having 215s on an 8.5 I think its the narrowest I would want to go.

225s on a 9, Keiths car?

http://www.tyrestretch.com/zp-core/i.php?a=9_225_40_R18&i=9_225_40_R18_Falken_452_2.jpg&s=595&cw=&ch=&q=85

I got 205's in the front now on a 9.5 inch wheel, it's not bad at all. Can't wait to see the DPE's!

justinp95
11-08-2010, 08:50 AM
I have 18x8.5 with 225/40r18s with no rubbing unless something is really heavy in the back. Not sure of the GTF but its pretty low.

.Mad Hatter.
11-08-2010, 10:46 AM
You can't be that low, I know that would rub if you were. Either that or you have a very high offset...what suspension are you on?