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      04-18-2008, 03:12 AM   #1
hahayan
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19" for Non M Z4 3.0si Coupe too big ?

wondering....are most people mostly use 18" on your Non M Z4 3.0i ?

are 19" for Z4 is too big ?

also wondering will a BBS CH Size is 19"x8.5 and 19"x9J for E92, fit to my 2007 Z4 3.0si coupe ?

thx thx
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      04-18-2008, 08:07 AM   #2
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19s are not too big. its just when you go a wheel size bigger than what comes oem, you may see more wheel gap than you prefer despite the fact overall diameter remains the same (thats why most people usually lower theirs cars when they go up in wheel size). but on a car like ours which come with a sports suspension, i don't think 19s would look bad at all. the only thing you need to be concerned with is offset and width.

in regards to your CHs, assuming its a 35mm/40mm offset for front and rear, it should fit fine =)
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      04-18-2008, 08:10 AM   #3
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They are certainly too big for my preference, but they will fit on the car. Its all up to what you like. If you want 19s, they will fit.
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      04-18-2008, 10:10 AM   #4
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""in regards to your CHs, assuming its a 35mm/40mm offset for front and rear, it should fit fine =)""

thx..for your information...


now, it is the stock 225/40 R18 , and 255/35 R18....

i used to drive a e46 330ci at 235/35/19, and 265/30/19 ... more stable ride.., but accereation..wise..no good..and slighty higher fuel consumption..

wondering..what size..should i go if 19 "..for my Z4 coupe
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      04-18-2008, 10:18 AM   #5
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Quote:
Originally Posted by hahayan View Post
""in regards to your CHs, assuming its a 35mm/40mm offset for front and rear, it should fit fine =)""

thx..for your information...


now, it is the stock 225/40 R18 , and 255/35 R18....

i used to drive a e46 330ci at 235/35/19, and 265/30/19 ... more stable ride.., but accereation..wise..no good..and slighty higher fuel consumption..

wondering..what size..should i go if 19 "..for my Z4 coupe
for the CH in 19s, you want to go...

front: 225/35-19
rear: 255/30-19
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      04-18-2008, 10:21 AM   #6
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If you think it is not too big on an M, then not too big for non-M. As far as the BBS CH's are concerned, that is top 3 wheel choices for me on M3's. Post picks on our car if and when you get them. I think it will look great!
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      04-18-2008, 10:38 AM   #7
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yes..i am on the tire rack to check the look of the CH .., someone offer me 19x8.5J and 19x9 .. a almost new used set...

but not sure the offset.. ,it was on the E92..

i also just check.. ,i may go for 225/35/19 and 255/30/19

which shall not add too much weight, and may not give up too much acceration..

wondering the stock 18 wheel 's weight..compare to those CH at 19"
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      04-18-2008, 12:25 PM   #8
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the bbs ch's are def my top choice. its just i refuse to buy a new set and i have yet to see a staggered setup in 18s/19s in good condition available in the classifieds.
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      04-20-2008, 10:15 PM   #9
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WONDERING ANY RUBBING ISSUE WITH LOW DOWN..OR WITHOUT LOW DOWN ..FOR THIS SET UP

for the CH in 19s, you want to go...

front: 225/35-19 X 8.5 ET 35
rear: 255/30-19 X 9.5 ET 40
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      04-20-2008, 10:40 PM   #10
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IMHO I think 18"s are perfect for the Z4, and will in all likelihood give you slightly better performance due to lighter weight and the rotation mass being closer to the center. Ride quality will be better, wheels and tires will be less expensive, and they will be less likely to get bent or curbed. I was looking at 19"s some months ago and ultimately decided against it.
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      04-21-2008, 12:04 AM   #11
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the CH at those sizes is actually weight lighter or about the same the my exisit wheel (style 202 at 18x8 ET47. 18x8.5 ET 50)

for the tire , take the PS2 as an example..information from tirerack

original sizes and weight : 225/40/18 at 21 lbs, 255/35/18 at 24 lbs

new sizes : 225/35/19 at 21lbs , 255/30/19 at 24lbs

therefore..the new combo shall weigth about the same


rotation mass is further away from the centre.., it shall affect a bit..

really do worry about the rubbing issue.if it is lower...

and cost for new tire.....
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      04-21-2008, 07:54 PM   #12
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I'm running
19 x 8.5 235/35/ Front
19 x 9.5 265/30 Rear
with 35/40 offsets
on a non M roadster
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      04-22-2008, 07:00 AM   #13
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Quote:
Originally Posted by innerconx View Post
I'm running
19 x 8.5 235/35/ Front
19 x 9.5 265/30 Rear
with 35/40 offsets
on a non M roadster

assume u are running with issue and rubbing ..., and do u lower your car ? if u lower..what do u use , just spring..or new stock wiht spring.., or coli ?

any comfort imporvement from change from RFT to the new set up ?
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      04-23-2008, 06:22 AM   #14
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I'm on stock suspension at the moment with out any rubbing issues. A 1/2" drop is semi planned for the future.
I found the ride improved alot over the Bridgestone RFT's, as well as an improvement in overall response.

Quote:
Originally Posted by hahayan View Post
assume u are running with issue and rubbing ..., and do u lower your car ? if u lower..what do u use , just spring..or new stock wiht spring.., or coli ?

any comfort imporvement from change from RFT to the new set up ?
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      04-23-2008, 11:54 AM   #15
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thx..thx//for your sharing..

my plan is

19 x 8.5 225/35/ Front
19 x 9.5 255/30 Rear
with 35/40 offsets
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      02-24-2009, 11:57 AM   #16
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Quote:
Originally Posted by hahayan View Post
thx..thx//for your sharing..

my plan is

19 x 8.5 225/35/ Front
19 x 9.5 255/30 Rear
with 35/40 offsets
i want the biggest size i can get because my main concern is the stance, however im worried because where i live theres too many holes in the roads so would this config stand against imperfections in the road? by the way i have a 2.5si but i dont know if my car have sport suspension [people say si models come with sport suspension but im not sure] thx
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      03-18-2009, 10:26 AM   #17
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Quote:
Originally Posted by dekaliber View Post
IMHO I think 18"s are perfect for the Z4, and will in all likelihood give you slightly better performance due to lighter weight and the rotation mass being closer to the center. Ride quality will be better, wheels and tires will be less expensive, and they will be less likely to get bent or curbed. I was looking at 19"s some months ago and ultimately decided against it.
Hmmm, for most of the reasons you cited the smallest diameter wheels that will fit over the brakes would be "perfect for the Z4". If 18"s are "perfect", what would be your reasons for not going with a smaller wheel?

I've always been from the school where form (looks) follow function (performance). If you put on what performs best, then that's what performance looks like. Where as giving your car that "performance look" won't automatically make it perform.

Rubberbands belong in your desk drawer, not on your car.

Last edited by UncleScottie; 03-18-2009 at 10:49 AM..
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      04-06-2009, 08:47 PM   #18
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Quote:
Originally Posted by innerconx View Post
I'm running
19 x 8.5 235/35/ Front
19 x 9.5 265/30 Rear
with 35/40 offsets
on a non M roadster
Exact same here. The offset matters a lot too.

I dont think 19's look too big. 20's sure do.
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      05-05-2009, 02:08 AM   #19
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http://www.zpost.com/forums/showthread.php?t=101814 Here are my 19s 275s in the back. 275s are awesome!
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      05-05-2009, 09:42 AM   #20
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I'm running
19 x 8.5 235/35/ Front
19 x 9.5 265/30 Rear
with 35/40 offsets
on an si coupe with sport suspension. I have rubbing going on in the front. Is there anyone that is running the same setup lowered on either the non-sport and sport suspension. They use the same lowering springs I believe.
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      05-05-2009, 11:35 AM   #21
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i have

19x8.5 235/35 front
19.9.5 265/30 rear

with 40/45 offsets

Im lowered on eibachs and i don't rub at all.
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