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      01-10-2012, 06:19 PM   #1
Eddy@ApexRaceParts
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Thumbs up APEX 18" ARC-8 Wheel Group Buy (Round #5 & #6)

APEX ARC-8 Wheel Group Buy (Round #5 & #6)

This Group Buy is now CLOSED



Due to hundreds of requests from members, we are hosting more Group Buys for the ARC-8 wheels
Customers have been inquiring about this specific round since October 2011
Other sizes will be available in upcoming Group Buys throughout the year
This Group Buy is listed on multiple forums: M3Forums, Bimmerforums, E46Fanatics, ZPost, E90Post & M3Post
The more members that sign up, the lower the price will be for everyone


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Please note the size restrictions for Round #5 and #6
There is no minimum member requirement to receive the 1st tier discount!
Discounts increase as additional members sign up for each size


Group Buy #5 Discounts and Sizes
Wheels can be purchased in any combination (square or staggered) from the below list. No other combinations available

Sizes Available:
18x 9.5" ET35 - 18.85lbs - Retail $314 each
18x10.0" ET25 - 19.95lbs - Retail $324 each
18x10.5" ET27 - 20.45lbs - Retail $344 each


1 -10 Buyers = Retail Price + FREE Shipping*
11-20 Buyers = XXX OFF SET & FREE Shipping*
21-30 Buyers = XXX OFF SET & FREE Shipping*
31-40 Buyers = XXX OFF SET & FREE Shipping*
41-45 Buyers = XXX OFF SET & FREE Shipping*
46 + Buyers = XXX OFF SET & FREE Shipping*


MAX DISCOUNT REACHED!

Official PAID member list:
1. Sanju R.
2. Darren K.
3. Aaron M.
4. Evan B.
5. Kevin L.
6. William T.
7. Alex B.
8. Patrick S.
9. Nicholas R.
10. Mike C.
11. Paul H.
12. Benjamin O.
13. John A.
14. Vincent M.
15. Philip O.
16. Christian C.
17. Andrew W.
18. Arash K.
19. Jin Y.
20. Kalson C.
21. Richard S.
22. James C.
23. Simon H.
24. Chris C.
25. Andrei L.
26. Alexander G.
27. Christopher H.
28. Leslie D.
29. Carlos F.
30. Wes W.
31. Matthew C.
32. Ivan S.
33. Michael R.
34. Patty C.
35. Gary B.
36. Eric K.
37. Eric T.
38+39. John C.
40. Scott S.
41. Dmitri G.
42. Salvador B.
43. Mark C.
44. Michael S.
45. Ken L.
46. James R.
47. Sean T.
48. Ray P.
49. Ethan C.
50. Greg O.
51. John M.
52. Ryan M.
53. Ryan B.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Group Buy #6 Discount and Sizes
Must select a size from the "front" list, and a size from the "rear" list to create a staggered setup. No square setups of the same size. No sizes from the same category.

Front Sizes Available:
18x8.5" ET38 - 18.45lbs - Retail $289 each
18x9.0" ET42 - 18.65lbs - Retail $299 each
18x9.5" ET22 - 19.10lbs - Retail $314 each

Rear Sizes Available:
18x9.5" ET35 - 18.85lbs - Retail $314 each
18x10.0" ET25 - 19.95lbs - Retail $324 each
18x10.5" ET27 - 20.45lbs - Retail $344 each


1 -10 Buyers = Retail Price + FREE Shipping*
11-19 Buyers = XXX OFF SET & FREE Shipping*
20-29 Buyers = XXX OFF SET & FREE Shipping*
30-34 Buyers = XXX OFF SET & FREE Shipping*
35-39 Buyers = XXX OFF SET & FREE Shipping*
40 + Buyers = XXX OFF SET & FREE Shipping*


Official PAID member list:
1. John S.
2. Tim T.
3. Shane B.
4. Kenneth B.
5. James W.
6. Matthew S.
7. Andreas M.
8. Vladimir F
9. Anton G.
10. Ryan H.
11. Blair W.
12. Scott B.
13. Hsiao-Wei
14. Michael R.
15. Peter F.
16. Thotsakhan X.
17. Gerald T.
18. Matt G.
19. Francisco P.
20. Martin M.
21. Martin M.
22. Martin M.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Group Buy Details:

Official Open Date = January 24th
Official Close Date = February 2nd
Product Ship Date = February 13th


Free Shipping*
Free Shipping is available to members in the 48 mainland states
Alaska, Hawaii, and International members will receive a $75 credit off the actual cost of shipping
non-mainland/international members: please contact us prior to ordering for a shipping quote
We'll either send you an invoice, or a code to adjust your order

Local Pickup Discount:
Local customers who pick up their set will receive a $35 discount on their order.

When do these ship?:

CURRENT ETA: February 13th
This is a Pre-order Group Buy. Wheels do not ship the day after making payment like a traditional order
All orders should ship by February 13th, many will ship before the 13th
Some of these wheels are currently in production and scheduled to arrive at our facility the first week of Feb
We will ship those out within 3 business days of container arrival
Customs/Port delays can add an extra 1 week delay, but its rare
We cannot guarantee an exact ETA date. Our estimates have historically been conservative and within +/- one week of our ETA date
We will keep everyone up to date of even minor changes if they occur via this thread

Finish Availability
Finish availability will be offered on a first-come-first-serve basis
Members will now have the option to select between 3 choices at checkout regarding their finish choice

#1 Only accept the original finish choice
If it's out of stock, the order will be automatically cancelled at the close of the Group Buy

#2 Select an alternative finish choice
If the first choice is no longer available, the order will be adjusted to the secondary finish choice
If the secondary choice is also unavailable, the order will automatically be cancelled
If for any reason you don't care what finish you get, please note that in the comment field at checkout
We will determine adjustments at the close of the group buy based on one of two methods
If the max tier is reached, then any finish adjustments needed would be based solely on order of payment received
If the max tier is not reached, then orders will be adjusted in a way to maximize the number of participants, thus reaching the highest tier possible for the group as a whole
In this second scenario, priority will be allocated to members ordering staggered setups of a low availability finish, in order to create the most sets possible

#3 The option to wait until the first finish choice is back in stock
If there is enough inventory, wheels would ship right away to these customers
If it is out of stock, then the order will be back-ordered
We have another huge batch of wheels that is almost complete, and they will be arriving in March
Members who select this option will lock in their discount pricing and are guaranteed to receive their first finish choice
This is ideal for those who can wait if needed, and are unwilling pick an alternative finish
In previous Group Buys, all members would wait 4-6 weeks after the close date of the Group Buy to receive their wheels, so this format is not new
We are looking at the same exact time line for the next large shipment arrival, and we'll have a much more accurate ETA date in a few weeks, so there will be no surprises

How do I join? Payments and Sign-up info
This Group Buy is now CLOSED
Absolutely no late sign-ups will be accepted after midnight February 2nd Pacific time


Discount Tiers
The price you pay at sign up is based on how many members are currently signed up
At the close of the Group Buy, everyone's order/payment will be adjusted to the final discount tier reached
Your card or PayPal account will be authorized for the going rate, and then charged for the final price reached (the lowest price)
At the end, everyone pays the same price
There is zero advantage in signing up at the last minute
Early sign-ups promote others to sign-up, so don't sabotage your own discount

Refunds
There are NO refunds on Group Buy orders. Group Buys are special order, which is why payment is taken in advance
Only replacement of defective, or mis-shipped products are available
Members cannot change colors or sizes after receipt for Group Buy orders
If you would like a traditional 30 Day return policy then we recommend purchasing at the retail price, and not via the Group Buy

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Wheel Details:

Manufacturing process:
All APEX wheels are flow-formed resulting in a light weight, track and street worthy wheel
Flow-forming significantly reduces weight in the barrel by rolling the barrel out into it's final shape using large wheels/disks applying high pressure
This step is the same step that monoblock forged wheels go through to shape their barrels
By doing this, the flow-formed wheel's barrel has the same density and strength as the barrel of a fully forged wheel
This significantly reduces rotational mass at the furthest point from the center, which is the most important weight savings area on a wheel.

Strength:
These wheels are fully JWL/VIA certified. Strength testing was done by the VIA in Japan
Don't be fooled by competitors that claim to be certified, but cannot provide registration numbers
There are vendors on this forum selling wheels that are not certified, yet they claim they are. Scary stuff!
CLICK HERE to see all VIA registration numbers

Misc.
Comes with carbon-look APEX center caps
Accepts OEM Roundel center caps
Does not come with valve stems
Installs using your factory lugs or a stud conversion
Accepts all wheel spacers including 5mm while still remaining hub-centric
TPMS compatible

Satin Black


Hyper Black


Anthracite


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Last edited by Eddy@ApexRaceParts; 02-03-2012 at 01:57 PM.
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      01-10-2012, 07:39 PM   #2
kennyfrc
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Group buy #6

18X9F ET42

18X10R ET25

Hyperblack Finish
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      01-10-2012, 10:34 PM   #3
a_riddler
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Group #6
18x9.5 et22 (F)
18x9.5 et35 (R)
Hyperblack
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      01-10-2012, 10:52 PM   #4
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Group #6
18X9
18X10
Satin Black
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      01-10-2012, 11:02 PM   #5
johanness
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Garage List
Group buy #6

I'm in for a set of HyperSilver (maybe HyperBlack):

F: 18x9.5 et35 - 245/40/18
R: 18x10 et25 - 275/35/18

Question:

1) your narrowest CONCAVE wheel is still 9.5?
2) the above will fit with approx how much neg camber? (planning on shim kit max -2.5ish)

Last edited by johanness; 01-11-2012 at 11:25 PM.
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      01-11-2012, 09:48 AM   #6
SmartBastard
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Group Buy #6
Fronts 18x8.5" ET38 - 18.45lbs - Retail $289 each
Rears 18x9.5" ET22 - 19.10lbs - Retail $314 each (you have them listed as fronts for some reason)
Anthracite

Please send me a shipping quote for:
Slovakia, 81102 Bratislava
and/or
Austria, 1040 Vienna

Thanks, was waiting for a group buy for a while now

Last edited by SmartBastard; 01-11-2012 at 11:24 AM.
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      01-11-2012, 12:40 PM   #7
Beedub
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whats the ideal z4m sizes for no rub in the APEX??? want to jump on this while the GB is on.
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      01-11-2012, 12:47 PM   #8
BaldTyres
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Quote:
Originally Posted by Beedub View Post
whats the ideal z4m sizes for no rub in the APEX??? want to jump on this while the GB is on.
The 18x9 for front and 18x10 for rear is probably the most popular, since those won't rub and don't require spacers or negative camber.
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      01-11-2012, 01:22 PM   #9
cliffhopper
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GB #6

18x8.5 et 38
18x9.5 et 22
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      01-11-2012, 04:20 PM   #10
SmartBastard
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Quote:
Originally Posted by Beedub View Post
whats the ideal z4m sizes for no rub in the APEX??? want to jump on this while the GB is on.
I would say 18x8.5 et 38 and 18x9.5 et 22. You probably want 245 front and 275 rear tires to have no rubbing and 99% of manufactures would suggest 8.5 for 245 and 9.5 for 275.

Just my 2 cents.
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      01-11-2012, 07:21 PM   #11
kosh2k
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Group buy #6

18X9F ET42

18X10R ET25

Satin Black Finish
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      01-11-2012, 10:06 PM   #12
Eddy@ApexRaceParts
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Quote:
Originally Posted by SmartBastard View Post
Group Buy #6
Fronts 18x8.5" ET38 - 18.45lbs - Retail $289 each
Rears 18x9.5" ET22 - 19.10lbs - Retail $314 each (you have them listed as fronts for some reason)
Quote:
Originally Posted by cliffhopper
GB #6

18x8.5 et 38
18x9.5 et 22
Quote:
Originally Posted by Smart Bastard
I would say 18x8.5 et 38 and 18x9.5 et 22. You probably want 245 front and 275 rear tires to have no rubbing and 99% of manufactures would suggest 8.5 for 245 and 9.5 for 275.
18x8.5" ET38 and 18x9.5" ET22 is not an option in this Group Buy. There is no mistake in the listed combinations available. The 18x9.5" ET22 wheel is a front wheel for the E9X M3. It can be used as a rear wheel on some cars, but there is not enough inventory to make that possible. For Z4M owners who are interested in participating in Group Buy, and were interested in the 9.5" rear wheel, they will have to go with either the 18x10" ET25 wheel or the 18x9.5" ET35 rear wheel. Both sizes have been used by members of this forum.

To clarify: For Group Buy #6, you can only pick two wheels from the "front" wheel column, and 2 wheels from the "rear" wheel column. No square setups or other options are available. Group Buy #5 can be square or staggered from the 3 sizes listed, which is less applicable to most Z4M owners.

updated feeler list

Round #5
1. 99GREENM3- 18x9.5" ET35- Hyper Silver - Bimmerforums
2. Ramp1- 18x9.5" ET35- Hyper Silver- M3Forum.net
3. ///M3AN ONE- 18x10" ET25- Satin Black- M3Forum.net
4. M Nectar- 18x9.5" ET35- unspecified- M3Forum.net
5. tlarocque- 18x9.5" ET35- Satin Black- M3Forum.net
6. Beetroot- 18x9.5" ET35- Hyper Black- M3Forum.net
7. jibbonacci- 18x9.5" ET35- unspecified- M3Forum.net
8. AXDB- 18x9.5" ET35- Anthracite- M3Forum.net
9. stash1- 18x9.5" ET35- Hyper Silver- M3Forum.net
10. MasterC17- 18x9.5" ET35- Hyper Silver- E46Fanatics.com
11. conedrac- 18x9.5/18x10- Hyper Black - M3Forum.net

Round #6
1. PowerM3- 18x8.5" ET38- 18x9.5"- Hyper Black- M3Forum.net
2. Kennyfrc- 18x9" ET42- 18x10" ET25- Hyper Black- Zpost.com
3. a_riddler- 18x9.5" ET22- 18x9.5" ET35- Hyper Black- Zpost.com
4. baldTyres- 18x9" ET42- 18x10" ET25- Satin Black- Zpost.com
5. johanness- 18x9.5"ET35- 18x10" ET25- Hyper Silver- Zpost.com
6. SmartBastard- 18x8.5" ET38- 18x9.5"- Anthracite- Zpost.com - need to select different rear wheel
7. Cliffhopper- 18x8.5" ET38- 18x9.5"- unspecified- Zpost.com - need to select different rear wheel
8. Imperial Sloth- 18x8.5" ET38- 18x9.5" ET35- unspecified- E90Post.com
9. Kenshin223- 18x9.5" ET22- 18x10.5" ET27- Hyper Silver -Bimmerforums.com
10. kosh2k- 18x9" ET42- 18x10" ET25- Satin Black- Zpost.com



This list will constantly be updated, and it is not a commitment to buy as listed. It's just used as a general feeler. You will select your final size and color choice at checkout.
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      01-11-2012, 11:56 PM   #13
RedDotRacer
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Quote:
Originally Posted by a_riddler View Post
Group #6
18x9.5 et22 (F)
18x9.5 et35 (R)
Hyperblack
Will this work on a z4mc stock setup with no rubbing?To me this would be best for having the concave look on both front and rear.
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      01-12-2012, 03:54 AM   #14
SmartBastard
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Quote:
Originally Posted by paintpro21 View Post
18x8.5" ET38 and 18x9.5" ET22 is not an option in this Group Buy. There is no mistake in the listed combinations available. The 18x9.5" ET22 wheel is a front wheel for the E9X M3. It can be used as a rear wheel on some cars, but there is not enough inventory to make that possible. For Z4M owners who are interested in participating in Group Buy, and were interested in the 9.5" rear wheel, they will have to go with either the 18x10" ET25 wheel or the 18x9.5" ET35 rear wheel. Both sizes have been used by members of this forum.

To clarify: For Group Buy #6, you can only pick two wheels from the "front" wheel column, and 2 wheels from the "rear" wheel column. No square setups or other options are available. Group Buy #5 can be square or staggered from the 3 sizes listed, which is less applicable to most Z4M owners.
Thank you for your answer, kinda shame that we can't get the 9.5" ET22 for rear but I guess there's price to pay for a group buy. Please change my rears to
18x10.0" ET25 - 19.95lbs - Retail $324 each
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      01-12-2012, 07:48 AM   #15
Beedub
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Quote:
Originally Posted by BaldTyres View Post
The 18x9 for front and 18x10 for rear is probably the most popular, since those won't rub and don't require spacers or negative camber.

baldtyresid really like to jump on these sizes for the z4m.... are you sure these wont rub?? what tyre sizes are you thinking of running?? im am slightly concerned as i have a BBK, BUT im guessing the extra width will give me that space without having a physically lower offset if you get me...

also OP im in the UK??? how much willing shipping run me?? and will i be able to get a discount on the actual wheels alittle further to offset some of the shipping costs, as im guessing you wont ship internation for free, or am i wrong!! drop me a pm if you prefur.

edit; just seen this thread http://www.zpost.com/forums/showthread.php?t=543845 i guess this wont work for me.. i agree we need the 8.5 and 9.5 options for a track driven car.
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Last edited by Beedub; 01-12-2012 at 08:03 AM.
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      01-12-2012, 08:04 AM   #16
Beedub
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OP once we can get the rear in 9.5 with mid twentys offset, please drop me a PM so i can buy a set from you.
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      01-12-2012, 08:33 AM   #17
SmartBastard
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Thumbs up

Quote:
Originally Posted by Beedub View Post
also OP im in the UK??? how much willing shipping run me?? and will i be able to get a discount on the actual wheels alittle further to offset some of the shipping costs, as im guessing you wont ship internation for free, or am i wrong!! drop me a pm if you prefur.

edit; just seen this thread http://www.zpost.com/forums/showthread.php?t=543845 i guess this wont work for me.. i agree we need the 8.5 and 9.5 options for a track driven car.

OP once we can get the rear in 9.5 with mid twentys offset, please drop me a PM so i can buy a set from you.
It was rubbing with the 18x10" because he had lowered the car, should be okay if you are stock. However I would also be more happier about the 9.5" ET22 in rear just because it's 1.1lbs lighter and fits better.

"International members will receive a $75 credit off the actual cost of shipping"

Last edited by SmartBastard; 01-12-2012 at 08:43 AM.
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      01-12-2012, 08:42 AM   #18
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Exclamation

Quote:
Originally Posted by a_riddler View Post
Group #6
18x9.5 et22 (F)
18x9.5 et35 (R)
Hyperblack
Quote:
Originally Posted by RedDotRacer View Post
Will this work on a z4mc stock setup with no rubbing?To me this would be best for having the concave look on both front and rear.
Nope, that setup will not work with a stock Z4M. The front is waaaay to wide. Like already said the 18x9.5 et22 would be ideal for Z4M rear but not front. Anything above 9" in front is no brainer.
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      01-12-2012, 09:24 AM   #19
BaldTyres
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Quote:
Originally Posted by Beedub View Post
baldtyresid really like to jump on these sizes for the z4m.... are you sure these wont rub?? what tyre sizes are you thinking of running?? im am slightly concerned as i have a BBK, BUT im guessing the extra width will give me that space without having a physically lower offset if you get me...

also OP im in the UK??? how much willing shipping run me?? and will i be able to get a discount on the actual wheels alittle further to offset some of the shipping costs, as im guessing you wont ship internation for free, or am i wrong!! drop me a pm if you prefur.

edit; just seen this thread http://www.zpost.com/forums/showthread.php?t=543845 i guess this wont work for me.. i agree we need the 8.5 and 9.5 options for a track driven car.

So, as that post shows, yes, you will probably experience a little rubbing if you lower your car and run it on the track.

Here's some quotes from paintpro21 about these wheels, which is the info I was going off of:

Quote:
18x8.5" et38 wheels fit up front with great ease and either 235/40/18's or 245/40/18's.

18x9.0" et42 wheels also fit up front without the need for a spacer with 245/40/18 tires summer tires.
255/35/18 tires can be run on this size wheel, but a spacer may be needed.
Negative camber and spacers may be required depending on the 255 tire run as r-compounds and extreme summer tires can run wide.

18x9.5" et35 & et22 two offsets available, both work well, but the new et22 offset is the best fit.
They can be run with either 265/35/18 or 275/35/18 street tires or r-compounds.
The 9.5" et35 wheel can also be used up front with 245/35/18's or 255/35/18's with added negative camber.

18x10" et25 fit the rear with 275/35/18's with ease on stock and lowered cars.
R-compounds may have slight rubbing on the inner rear fender liner material.
This is a foam sound deadening material that can easily be trimmed or ignored.
Staggered Setup:
Quote:
Front:
18x8.5" - 235/40/18
18x8.5" - 245/40/18
18x8.5" - 255/35/18
18x9" - 245/40/18 - Popular fitment
18x9" - 255/35/18 - spacer may be needed depending on the tire type used
18x9" - 265/35/18 - spacer needed, thickness depends on tire type used
18x9.5" - 245/40/18 - Spacer and negative camber needed
18x9.5" -255/35/18 - Spacer and negative camber needed
18x9.5" -265/35/18 - Spacer and negative camber needed

Rear:
18x9.5" - 265/35/18 - Popular fitment
18x9.5" - 275/35/18
18x10" - 275/35/18 - Popular fitment
18x10.5 - 275/35/18 - aggressive fitment
Square Setup:
Quote:
18x9" Front & Rear with 245/40/18 - Spacer used in the rear
18x9" Front & Rear with 255/35/18 - Spacer used in the rear - Front spacer may be needed depending on tire type used
18x9" Front & Rear with 265/35/18 - Spacer used in the rear - Front spacer needed, spacer thickness depends on tire type used
18x9.5" Front & Rear with 255/35/18 - Front spacer and negative camber needed
18x9.5" Front & Rear with 265/35/18 - Front spacer and negative camber needed
Anyways, go with what you feel comfortable with and what your specific goals are for the car.
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      01-12-2012, 10:14 AM   #20
Beedub
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thanks guys, questions answered...
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      01-12-2012, 12:09 PM   #21
a_riddler
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I run -2.5 camber in the front. Not a stock setup. Going to run the 18x9.5 with 265 square r-compound tires for autoX. Yeah!
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      01-13-2012, 08:22 PM   #22
Eddy@ApexRaceParts
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Quote:
Originally Posted by Beedub View Post
whats the ideal z4m sizes for no rub in the APEX??? want to jump on this while the GB is on.
18x8.5" ET38 is the easiest front fitment as it's the most conservative. Few BMW models can fit an 18x9" wheel up front that is direct fitment, but the Z4M is one of them. 18x9" ET42 will fit up front with a 245/40/18. For that reason, we recommend the 9" fronts as it's an ideal fitment.

In the rear 18x9.5" ET35, 18x9.5" ET22 and 18x10" ET25 fit. There are pictures on this forum all 3 wheel sizes mounted on the rear of the car.

18x10" ET25 is ideal for the rear as it can fit with a 275/35/18, but you could also mount a 265/35/18 or 265/40/18 back there. The slight stretch on the 265's would match that of the 245's on the 9's aesthetically, and that would improve the rear fender clearance. The stock rear tire size is tall, so a 275/35 or 265/40 works well with that, and the 10" wheels provide the proper sidewall support needed for those widths.

[QUOTERedDotRacer]Group #6
18x9.5 et22 (F)
18x9.5 et35 (R)
Hyperblack

Will this work on a z4mc stock setup with no rubbing?To me this would be best for having the concave look on both front and rear.[/quote]

That combination would be mounted the opposite way (ET35 front and ET22 rear) as the perfect spacer free square setup. But 18x9.5" ET35 will not fit up front on a stock Z4M. Negative camber will be needed.

Here's an 18x9.5" ET35 square setup (I'm not sure if rear spacers were used, it does not appear so). This car is using 265/35/18 Michelin Pilot cups all around. This is the ideal track setup for a modified suspension as it is the same setup that most E46 M3 guys use. And the Z4m and E46 M3 are very similar. By running ET35 front and rear, you can rotate, which significantly saves on tire life.







Quote:
Originally Posted by Beedub
baldtyresid really like to jump on these sizes for the z4m.... are you sure these wont rub?? what tyre sizes are you thinking of running?? im am slightly concerned as i have a BBK, BUT im guessing the extra width will give me that space without having a physically lower offset if you get me...

also OP im in the UK??? how much willing shipping run me?? and will i be able to get a discount on the actual wheels alittle further to offset some of the shipping costs, as im guessing you wont ship internation for free, or am i wrong!! drop me a pm if you prefur.

edit; just seen this thread http://www.zpost.com/forums/showthread.php?t=543845 i guess this wont work for me.. i agree we need the 8.5 and 9.5 options for a track driven car.
The 18x9's will clear your BBK better than the 18x8.5's would. If you have a BBK installed on your car, then you should be going with conservative wheels. You should be running a wheel/tire package that is aggressive as you can go without issue. If you squeeze the same tire sizes onto narrower wheels, you are actually narrowing the contact patch due to tire ballooning, which also results in sloppier transitional response. 245's and 255's belong on a 9" rim for performance applications. What the manufacturer does is not a good reference source.

Because of your rear fitment concern, for your specific application I would run the following:

18x9" ET42 with 245/40/18
18x10" ET25 with 265/40/18 or 265/35/18 rear

If it was my car, I would run 275/35/18's

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

Unofficial Round #5 Feeler List:
1. 99GREENM3- 18x9.5" ET35- Hyper Silver - Bimmerforums
2. Ramp1- 18x9.5" ET35- Hyper Silver- M3Forum.net
3. ///M3AN ONE- 18x10" ET25- Satin Black- M3Forum.net
4. M Nectar- 18x9.5" ET35- unspecified- M3Forum.net
5. tlarocque- 18x9.5" ET35- Satin Black- M3Forum.net
6. Beetroot- 18x9.5" ET35- Hyper Black- M3Forum.net
7. jibbonacci- 18x9.5" ET35- unspecified- M3Forum.net
8. AXDB- 18x9.5" ET35- Anthracite- M3Forum.net
9. stash1- 18x9.5" ET35- Hyper Silver- M3Forum.net
10. MasterC17- 18x9.5" ET35- Hyper Silver- E46Fanatics.com
11. conedrac- 18x9.5/18x10- Hyper Black - M3Forum.net
12. kenshin223- 18x10.5" ET27- unspecified- Bimmerforums
13. bjo- 18x9.5" ET35- unspecified- M3Forum.net
14. fastfreddie- 18x10" ET25- Hyper Black- M3Forum.net
15. zaharias- 18x9.5" ET35- Hyper Black- E46Fanatics.com
16. checkmate- 18x10" ET25- Hyper Black- M3Post.com
17. E90Montreal- 18x10" ET25- Satin Black- M3Post.com
18. wwilson7- 18x10" ET25- Satin Black- M3Post.com

Unofficial Round #6Feeler List:
1. PowerM3- 18x8.5" ET38- 18x9.5"- Hyper Black- M3Forum.net
2. Kennyfrc- 18x9" ET42- 18x10" ET25- Hyper Black- Zpost.com
3. a_riddler- 18x9.5" ET22- 18x9.5" ET35- Hyper Black- Zpost.com
4. baldTyres- 18x9" ET42- 18x10" ET25- Satin Black- Zpost.com
5. johanness- 18x9.5"ET35- 18x10" ET25- Hyper Silver- Zpost.com
6. SmartBastard- 18x8.5" ET38- 18x10" ET25- Anthracite- Zpost.com
7. Cliffhopper- 18x8.5" ET38- 18x9.5"- unspecified- Zpost.com - need to select different rear wheel
8. Imperial Sloth- 18x8.5" ET38- 18x9.5" ET35- unspecified- E90Post.com
9. kosh2k- 18x9" ET42- 18x10" ET25- Satin Black- Zpost.com
10. M3only- 18x8.5" ET38- 18x9.5" ET35 unspecified- M3Forum.net
11. digivation- 18x9.5" ET22- 18x10.5" ET27- Satin Black- M3Forum.net
12. zaharias- 18x8.5" ET38- 18x9.5" ET35- Hyper Black- E46fanatics.com
13. Darkduke- 18x9.5" ET22- 18x10.5" ET27- Hyper Black- M3Post.com
14. e90fun- 18x8.5" ET38- 18x9.5" ET35- Hyper Silver- E90Post.com
15. Texas F1- 18x9.5" ET22- 18x10.5" ET27- Satin Black- 1Addicts.com
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