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      10-18-2012, 05:24 PM   #1
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► APEX | ARC-8 Light Weight Track Wheels



APEX ARC-8 Wheels

We are proud to continue offering our timeless ARC-8 wheel. This new wheel addresses the concerns of more and more racers and track day enthusiasts: long term durability, fitment, and performance. With the increase of faster and heavier cars being used in racing, HPDEs, and spirited driving, the ARC-8 was designed and engineered to handle extreme abuse on track and street, offer a wide range of direct fitments, while still producing a lightweight wheel.

Visit our website to order

The Good Stuff




1. They Fit Everything
The ARC-8's wide range of widths, diameters, offsets and face profiles result in 26 unique BMW fitments ranging from 8.5" to 10.5" wide. Each wheel combines these features to meet the different brake caliper, strut, and fender clearance needs of each BMW model.

2. Factory Support
Like all our APEX wheels, The ARC-8 supports all OEM hardware like OEM Roundel center caps, wheel lugs, valve stems, and TPMS sensors. No centering rings are needed either, as all of our 5x120 BMW wheels use a 72.56mm center bore.

3. Brake Clearance
ARC-8 wheels properly clear all OEM brake calipers. Our wheels are targeted at the serious performance-minded owner. The spokes of the flatter faced ARC-8 were designed to clear big brake kits, making it a better choice for BBK equipped cars. The concave version of the wheel is the best option for cars with factory brake calipers.

4. Concavity
The ARC-8 wheel is available in two unique face profiles. The shallower face provides increased caliper clearance on narrow applications, while the deeper concave face reduces weight and creates a stunningly aggressive appearance on low offset and wide width applications. These two face profiles are available in all 17", 18" and 19" diameters.

Designed for the Performance Enthusiast

Light-weight
Flow-forming allows for a significant reduction in rotational mass by reducing barrel weight. This manufacturing technique allows our wheels to be almost as light as a traditional forged wheel, but without the significant increase in price.

Strength
Track duty requires a wheel that can handle the punishment of high lateral G’s, hitting berms, and every once in a while, a small off track excursion. Spoke and barrel design are a major factor in wheel strength. The flow-forming technique uses high pressure disks/rollers to roll the wheel’s barrel into its final shape. This gives the barrel the same strength properties as a forged wheel, since monoblock wheels go through a similar step to form their barrels. We design our spoke dimensions to help evenly distribute loads from the barrel to the center of the wheel. The lack of a front lip, and spokes directly connecting to the edge of the wheel, also add increased strength to the outer lip of the wheel.

Chassis-Specific Fitments
Stretched rubber, narrow tires, and fender rubbing are not elements to look for in a competitive wheel/tire setup. All of our wheels were designed with offsets that allow for proper fitment of extreme summer, and r-compound tires without the need for spacers or fender rolling. This means keeping the tire under the fender, and away from suspension components. Track oriented wheel widths are also important as they provide proper sidewall support under hard cornering. Too much rubber for a wheel results in excessive sidewall deflection, which translates into sloppy and delayed turning response.

Multiple Fitment Options
Most BMWs come with a staggered setup from the factory. Some choose to keep their car this way, while others like to switch out for an easy-to-rotate, square/neutral setup. This is generally based on driver’s preference and consideration of tire costs. Most BMW chassis benefit from being able to fit both square and staggered setups with relative ease. 9.5” or 10”-wide square setups are great for budget minded enthusiasts who want to extend their tires life by rotating between events, in addition to preferring the feel of a square setup. Square setups are popular on all models for track use due to the significant increase in front grip and turn-in response. Some owners comment that due to the extra power of their cars, a square setup will lean towards oversteer. For those who prefer more rubber in the rear, a staggered setup is the way to go. Wheels up to 10.5" wide are available for rear fitment. These can be combined with 9” or 9.5” fronts for a bolt-on spacer-free staggered setup.

Open-Hub Center
Race wheels can't just be light, they need to function in a high performance environment. Unlike the narrow lug recesses of most other wheels, the ARC-8 wheel boasts a completely wide-open design that easily fits over-sized race lugs and beefy impact sockets. This allows for quick and easy wheel changes at the track, and as a bonus prevents chips and scratches from tools for those just running these wheels on the street.


The APEX Standard



1. FEA Optimization
Various design features were implemented to ensure that the ARC-8 wheel design was as light and durable as possible. We began with a strong one-piece design featuring an open hub center and reliefs in the mounting pad to remove weight between lug holes. The design was then run through Finite Element Analysis (FEA) to further optimize the spoke and barrel design. The result is a light weight wheel with extra strength in all the right places, while keeping weight to a minimum.

2. Always Flow Formed
All APEX wheels feature Flow-Formed construction tha utilizes rotary forging to produce a strong and lightweight barrel. The ARC-8 is no exception.

3. True JWL & VIA Certification
Strength needs to be certified. Our wheels were not simply FEA tested in a computer simulation, or in-house tested to an unregulated standard. We conduct real-world crush-testing and all of our wheels conform to Japan’s JWL standard, as well as being 3rd-party tested by the VIA. All of our wheels carry a 690KG load rating.


Available Finishes


Note: Not all sizes are available in all finishes.

Face Profiles



Sizes, Weights, and Pricing


17" Sizes
18" Sizes
19" Sizes

Questions about tires, fenders, brakes, spacers, or suspension clearances?
Click here to get a personalized fitment recommendation from one of our experts.



On-Car Photos



Shown above: E46 M3 with 18x9.5 ET35 and 18x10.5 ET27 with 245/40/18 and 275/35/18 tires.


Shown above: E90 M3 with 17x10 ET25 with 275/40/17 tires all around.


Shown above: E92 M3 with 18x10.5 ET27 with 285/30/18 tires all around.

Check out our extensive collection of photos on our Flickr page. See more ARC-8 photos >>>

Tire Mounting and Balancing Service




Popular street and track tires are now available when you order APEX wheels. Add tires with your wheel order and get free tire mounting and balancing by our trusted enthusiast technicians. We use high-end, touchless equipment and inspect every wheel and tire combo thoroughly before they leave our warehouse. With our competitive tire pricing bundled with the savings of free mounting and balancing and convenience, it’s the ultimate wheel & tire package.

*Note: Tires will only ship mounted to the wheels in your order, and can not be sold separately. Tires and wheels must be purchased in the same transaction. Tire-only orders will be cancelled and refunded.

Available Tire Brands:

Ordering and Contact Information
  • Hours: Monday - Friday, 9AM to 6PM PST
  • Shipping: All orders are shipped directly from us via UPS. Local pickup also available at our Livermore, CA Warehouse. (Map It)

Last edited by ApexRaceParts; 09-29-2017 at 07:17 PM.
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      10-29-2013, 12:42 AM   #2
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Anyone have a pic of these powder coated in white on an mc? I'm thinking about it..
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      10-29-2013, 10:07 AM   #3
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z4m fitment can you check the AP bbk on the 17" rim in 9" width with et30 please..
heres the template...

http://www.apracing.com/Drawings/P16230.pdf
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      10-29-2013, 05:03 PM   #4
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Quote:
Originally Posted by RedDotRacer View Post
Anyone have a pic of these powder coated in white on an mc? I'm thinking about it..
We have not seen that yet, you would be the first!

Quote:
Originally Posted by Beedub View Post
z4m fitment can you check the AP bbk on the 17" rim in 9" width with et30 please..
heres the template...

http://www.apracing.com/Drawings/P16230.pdf
Not a problem, we will test it and will report our findings for you!
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      10-30-2013, 04:08 PM   #5
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thankyou david.... if this can clear i will order :-) payday in 3 days!!
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      11-09-2013, 02:57 PM   #6
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Quote:
Originally Posted by David@ApexRaceParts View Post
Satin Black ARC-8s on this Z4M Roadster:



We have many sizes finishes of the ARC-8's in Z fitment in stock right now!

I really like how concave these wheels are. I have kw v3's on the highest ride height possible without camber plates. Would this setup fit on my car without any rubbing? I believe the car in the photo is running 18x9.5 et35 and 18x10 et 25 with -2.5 camber without camber plates. My car is driven daily.

Thanks
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      11-11-2013, 08:54 PM   #7
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Quote:
Originally Posted by Bandlu View Post
I really like how concave these wheels are. I have kw v3's on the highest ride height possible without camber plates. Would this setup fit on my car without any rubbing? I believe the car in the photo is running 18x9.5 et35 and 18x10 et 25 with -2.5 camber without camber plates. My car is driven daily.

Thanks
With the KW Variants/ ST Coilovers, using the 18x9.5" ET35 ARC-8 with a 255/35/18 tire, you would hit either the spring perch or the bottom of the spring itself with the V shaped springs, so you will need to add a small 5mm spacer, or perhaps even larger depending on your ride height, to push the tire out away from the spring perch or spring. With the added spacer, you will need to dial in additional negative camber for the wheels and tires to clear the fenders properly, probably more than -3 degrees. In order to fix this issue with the 18x9.5" ET35 wheel clearance, you would want to switch to a linear spring. Because of their shape, it is recommended to be used with camber plates. You may be able to source upper top hat that would work with the OEM upper mount.

Some people go with a stretched tire of a 245/40/18 on the front, but we do not believe this would be a good solution as it would not provide the proper wheel protection due to the tire stretch. The best solution is still to change the KW V-shaped springs to the 6" linear race springs for proper fitment. The KW spring perch accepts a 60mm spring, thus you should look for a 6" 60mm spring from Swift, Hyperco, Eibach, or H&R. This will allow you to remove your V shaped spring and raise the lower spring perch higher to avoid the wheels and tires interfering.
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      11-13-2013, 01:55 AM   #8
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Quote:
Originally Posted by David@ApexRaceParts View Post
With the KW Variants/ ST Coilovers, using the 18x9.5" ET35 ARC-8 with a 255/35/18 tire, you would hit either the spring perch or the bottom of the spring itself with the V shaped springs, so you will need to add a small 5mm spacer, or perhaps even larger depending on your ride height, to push the tire out away from the spring perch or spring. With the added spacer, you will need to dial in additional negative camber for the wheels and tires to clear the fenders properly, probably more than -3 degrees. In order to fix this issue with the 18x9.5" ET35 wheel clearance, you would want to switch to a linear spring. Because of their shape, it is recommended to be used with camber plates. You may be able to source upper top hat that would work with the OEM upper mount.

Some people go with a stretched tire of a 245/40/18 on the front, but we do not believe this would be a good solution as it would not provide the proper wheel protection due to the tire stretch. The best solution is still to change the KW V-shaped springs to the 6" linear race springs for proper fitment. The KW spring perch accepts a 60mm spring, thus you should look for a 6" 60mm spring from Swift, Hyperco, Eibach, or H&R. This will allow you to remove your V shaped spring and raise the lower spring perch higher to avoid the wheels and tires interfering.
Thanks for that David

I'm not really interested in changing my springs. Would the 18x8.5 et 38 and 18x9.5 et22 fit with my standard v3s and without need for camber plates? How much camber would I need? Would they still look as concave? What tyres would you normally run on these rims?

Thanks

Kerstien
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      11-13-2013, 06:53 PM   #9
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Quote:
Originally Posted by Bandlu View Post
Thanks for that David

I'm not really interested in changing my springs. Would the 18x8.5 et 38 and 18x9.5 et22 fit with my standard v3s and without need for camber plates? How much camber would I need? Would they still look as concave? What tyres would you normally run on these rims?

Thanks

Kerstien
Kerstein, the 18x8.5" ET38 and 18x9.5" ET22 will indeed work with your car with the KW V3's without the need of switching to a linear race spring or camber plates, as it would be compatible with the OEM alignment specifications. However, the 18x8.5" ET38 is a flat faced wheel, so you'd have a staggered look with a concave rear wheel. The street tire sizes that we usually recommend are 235/40/18 and 265/35/18. Some people have gotten away with 245/35/18 and 275/35/18 street tire sizes, but extreme performance summer tires, such as Hankook RS3's and Dunlop Direzza Star Specs, would require a fender roll in the rear to avoid rubbing, and some added negative camber in the front depending on your ride height.
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      12-26-2013, 03:43 AM   #10
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Quote:
Originally Posted by David@ApexRaceParts View Post
With the KW Variants/ ST Coilovers, using the 18x9.5" ET35 ARC-8 with a 255/35/18 tire, you would hit either the spring perch or the bottom of the spring itself with the V shaped springs, so you will need to add a small 5mm spacer, or perhaps even larger depending on your ride height, to push the tire out away from the spring perch or spring. With the added spacer, you will need to dial in additional negative camber for the wheels and tires to clear the fenders properly, probably more than -3 degrees. In order to fix this issue with the 18x9.5" ET35 wheel clearance, you would want to switch to a linear spring. Because of their shape, it is recommended to be used with camber plates. You may be able to source upper top hat that would work with the OEM upper mount.

Some people go with a stretched tire of a 245/40/18 on the front, but we do not believe this would be a good solution as it would not provide the proper wheel protection due to the tire stretch. The best solution is still to change the KW V-shaped springs to the 6" linear race springs for proper fitment. The KW spring perch accepts a 60mm spring, thus you should look for a 6" 60mm spring from Swift, Hyperco, Eibach, or H&R. This will allow you to remove your V shaped spring and raise the lower spring perch higher to avoid the wheels and tires interfering.
Awesome post david. I'm interested in running a similar setup as below. My understanding is that this example is running 18x9.5 et35 and 18.10 et25 with 275/35 square tires. I have the same spec rims and am shopping for some competition tires for track use.

Problem is, I have kw v3 which have the progressive spring. I'm dialed in at around -3.5 degrees front camber. I don't rub at all with 19x8.5 et32 with 245/35 tire. Do you know how my car would respond to a 275/35 front on 18x9.5 et35? I am not opposed to using spacers.

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      12-27-2013, 06:04 PM   #11
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Quote:
Originally Posted by zubydafa View Post
Awesome post david. I'm interested in running a similar setup as below. My understanding is that this example is running 18x9.5 et35 and 18.10 et25 with 275/35 square tires. I have the same spec rims and am shopping for some competition tires for track use.

Problem is, I have kw v3 which have the progressive spring. I'm dialed in at around -3.5 degrees front camber. I don't rub at all with 19x8.5 et32 with 245/35 tire. Do you know how my car would respond to a 275/35 front on 18x9.5 et35? I am not opposed to using spacers.

275/35/18 is a pretty wide tire for an 18x9.5" wheel in the front of a Z4. We have experienced clearance issues with the KW suspension with the 18x9.5" ET35 and a 255/35/18 tire, which is why we recommend a 5mm spacer for that setup. Since you have the V-shaped progressive springs with your V3's and you plan on running a 275 tire, you may need a 12mm spacer or larger to clear the spring perch. This may require additional camber as well to clear the fender since you will be pushing the wheels further out past the fender than you would with a 5mm spacer.

This fitment will also depend on the model and brand of the tire you plan on running as some tires run wider than others. You may need to play with spacer sizes and camber settings to find the ideal setup for you. Please let us know if you have any other fitment questions and we'd be happy to assist you.
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      12-28-2013, 01:01 AM   #12
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Hey Dave, any pics of an alpine white m coupe with concave all around in satin black and hyper silver? I'm undecided on the two colors.
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      01-02-2014, 09:22 PM   #13
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Hey Dave, any pics of an alpine white m coupe with concave all around in satin black and hyper silver? I'm undecided on the two colors.
I will take a look for you and send over a PM!

Last edited by ApexRaceParts; 05-06-2014 at 05:16 PM.
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      01-04-2014, 04:27 AM   #14
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Sounds good. I'll wait for your pm. The black looks good.
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      04-24-2014, 04:32 PM   #15
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Hello David, I have both a Z4 and Z4MC, could you please elaborate which one of the wheels you have below are flat-faced or concave? Thank you!!!

17x8.5" ET20 - 16.50lbs - $259
17x8.5" ET40 - 17.20lbs - $249 - Z4 Non-M Fitment
17x9.0" ET30 - 16.50lbs - $264 - Z4M Fitment
17x9.0" ET42 - 17.20lbs - $259 - Z4 Non-M and Z4M Fitment
17x9.5" ET35 - 16.95lbs - $269 - Z4M Fitment
17x10" ET25 - 18.45lbs - $284 - Z4M Fitment
17x10.5" ET27 - 18.95lbs - $299
18x8.5" ET38 - 18.45lbs - $289 - Z4 Non-M and Z4M Fitment
18x8.5" ET45 - 18.20lbs - $289
18x9.0" ET42 - 18.65lbs - $299 - Z4 Non-M and Z4M Fitment
18x9.5" ET62 - 18.20lbs - $314
18x9.5" ET35 - 18.85lbs - $314 - Z4M Fitment
18x9.5" ET22 - 19.20lbs - $314 - Z4M Fitment
18x10" ET25 - 19.95lbs - $324 - Z4M Fitment
18x10.5" ET27 - 20.45lbs - $344
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      04-24-2014, 07:47 PM   #16
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Quote:
Originally Posted by donoman View Post
Hello David, I have both a Z4 and Z4MC, could you please elaborate which one of the wheels you have below are flat-faced or concave? Thank you!!!

Concave - 17x8.5" ET20 - 16.50lbs - $259
Flat Faced - 17x8.5" ET40 - 17.20lbs - $249 - Z4 Non-M Fitment
Concave - 17x9.0" ET30 - 16.50lbs - $264 - Z4M Fitment
Flat Faced - 17x9.0" ET42 - 17.20lbs - $259 - Z4 Non-M and Z4M Fitment
Concave - 17x9.5" ET35 - 16.95lbs - $269 - Z4M Fitment
Concave - 17x10" ET25 - 18.45lbs - $284 - Z4M Fitment
Concave - 17x10.5" ET27 - 18.95lbs - $299
Flat Faced - 18x8.5" ET38 - 18.45lbs - $289 - Z4 Non-M and Z4M Fitment
Flat Faced - 18x8.5" ET45 - 18.20lbs - $289
Flat Faced - 18x9.0" ET42 - 18.65lbs - $299 - Z4 Non-M and Z4M Fitment
Flat Faced - 18x9.5" ET62 - 18.20lbs - $314
Concave - 18x9.5" ET35 - 18.85lbs - $314 - Z4M Fitment
Concave - 18x9.5" ET22 - 19.20lbs - $314 - Z4M Fitment
Concave - 18x10" ET25 - 19.95lbs - $324 - Z4M Fitment
Concave - 18x10.5" ET27 - 20.45lbs - $344
Absolutely, I've notated all the Flat Faced and Concave wheels as you have requested above.
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      04-24-2014, 09:02 PM   #17
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Thank you... So, no concave front fitments for non-M Z4 even in 17"?
Also, when you say they will "fit" below, are you assuming stock suspension? Neither of my cars have any heavy camber plates (yet) because I want to keep them very streetable... Thank you for your response and time.


Flat Faced - 17x8.5" ET40 - 17.20lbs - $249 - Z4 Non-M Fitment
Flat Faced - 17x9.0" ET42 - 17.20lbs - $259 - Z4 Non-M and Z4M Fitment

Flat Faced - 18x8.5" ET38 - 18.45lbs - $289 - Z4 Non-M and Z4M Fitment
Flat Faced - 18x8.5" ET45 - 18.20lbs - $289
Flat Faced - 18x9.0" ET42 - 18.65lbs - $299 - Z4 Non-M and Z4M Fitment
Flat Faced - 18x9.5" ET62 - 18.20lbs - $314

Concave - 17x8.5" ET20 - 16.50lbs - $259
Concave - 17x9.0" ET30 - 16.50lbs - $264 - Z4M Fitment
Concave - 17x9.5" ET35 - 16.95lbs - $269 - Z4M Fitment
Concave - 17x10" ET25 - 18.45lbs - $284 - Z4M Fitment
Concave - 17x10.5" ET27 - 18.95lbs - $299

Concave - 18x9.5" ET35 - 18.85lbs - $314 - Z4M Fitment
Concave - 18x9.5" ET22 - 19.20lbs - $314 - Z4M Fitment
Concave - 18x10" ET25 - 19.95lbs - $324 - Z4M Fitment
Concave - 18x10.5" ET27 - 20.45lbs - $344
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      04-25-2014, 01:43 PM   #18
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Quote:
Originally Posted by donoman View Post
Thank you... So, no concave front fitments for non-M Z4 even in 17"?
Also, when you say they will "fit" below, are you assuming stock suspension? Neither of my cars have any heavy camber plates (yet) because I want to keep them very streetable... Thank you for your response and time.


Flat Faced - 17x8.5" ET40 - 17.20lbs - $249 - Z4 Non-M Fitment
Flat Faced - 17x9.0" ET42 - 17.20lbs - $259 - Z4 Non-M and Z4M Fitment

Flat Faced - 18x8.5" ET38 - 18.45lbs - $289 - Z4 Non-M and Z4M Fitment
Flat Faced - 18x8.5" ET45 - 18.20lbs - $289
Flat Faced - 18x9.0" ET42 - 18.65lbs - $299 - Z4 Non-M and Z4M Fitment
Flat Faced - 18x9.5" ET62 - 18.20lbs - $314

Concave - 17x8.5" ET20 - 16.50lbs - $259
Concave - 17x9.0" ET30 - 16.50lbs - $264 - Z4M Fitment
Concave - 17x9.5" ET35 - 16.95lbs - $269 - Z4M Fitment
Concave - 17x10" ET25 - 18.45lbs - $284 - Z4M Fitment
Concave - 17x10.5" ET27 - 18.95lbs - $299

Concave - 18x9.5" ET35 - 18.85lbs - $314 - Z4M Fitment
Concave - 18x9.5" ET22 - 19.20lbs - $314 - Z4M Fitment
Concave - 18x10" ET25 - 19.95lbs - $324 - Z4M Fitment
Concave - 18x10.5" ET27 - 20.45lbs - $344
That is correct, there isn't any direct fitments available for the Z4 non-M with the concave wheels. These recommended fitments are indeed for meant cars with OEM or close to OEM suspension. There are more aggressive fitments available, but those would require suspension modifications with camber plates.
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      04-29-2014, 06:56 PM   #19
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Here's an example of a track setup for a Z4M, squared 18x9.5" ET35 Hyper Black ARC-8s with 265/35/18:



Feel free to contact us directly if you have any questions.
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      04-30-2014, 02:06 AM   #20
donoman
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Quote:
Originally Posted by David@ApexRaceParts View Post
Here's an example of a track setup for a Z4M, squared 18x9.5" ET35 Hyper Black ARC-8s with 265/35/18:



Feel free to contact us directly if you have any questions.
This fitment looks good! Will it work on a Z4MC with stock suspension?
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      04-30-2014, 06:41 PM   #21
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Quote:
Originally Posted by donoman View Post
This fitment looks good! Will it work on a Z4MC with stock suspension?
Unfortunately, this fitment would require camber plates to fit on the front of the car without rubbing onto the fender. The OEM suspension would not be compatible without camber plates.
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      05-05-2014, 08:54 PM   #22
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Quote:
Originally Posted by ApexRaceParts View Post
ARC-8's are in stock for your Z4M and Z4 in multiple staggered and square fitments!



Please call, email, or pm us with any questions you may have.
Are those Hyper Black?
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