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01-07-2011, 02:01 AM | #1 | |
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APEX ARC-8 Product Details: E9X M3 Specific Track wheels
APEX ARC-8 Product Details and Specifications:
Light Weight Wheels for the E90 and E92 M3 Use this thread to discuss any fitment questions regarding the ARC-8 wheels and the E9X M3 application. With the product line up continually expanding, we will keep this first post updated with added sizes, and specification details. Specifications: 18x9.5” ET35 (18.85lbs) 18x9.5” ET22 (19.10lbs) 18x10.0” ET25 (19.95lbs) 18x10.5” ET27 (20.45bls) Available late April 2012 17x8.5" ET20 (16.55lbs) 17x10.0" ET25 (18.1lbs~) 17x10.5" (18.95lbs) All wheel are produced with a BMW specific center bore. No centering rings used. The M3 fitment does not require spacers. Wheels accept TPMS sensors, OEM Lugs, and OEM center caps Details: APEX ARC-8 wheels were designed to meet the specification needs of HPDE, race, and autocross drivers, while exceeding the requirements for every day street use. This makes them the perfect cost effective, dual duty wheel. Meeting the Performance Enthusiast’s requirements: Light-weight: Flow-forming allows for a significant reduction in rotational mass by reducing barrel weight. This manufacturing technique allows the ARC-8 wheel 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. The ARC-8's mesh design helps 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. Although a front lip can reduce weight, it can also make the wheel much more prone to bending, and this was an important factor when developing the wheel. Once a design is selected, it needs to be tested and certified for strength. The ARC-8 wheels were not just FEA tested in a computer simulation, or in house tested to an unregulated standard. They follow Japans JWL standard, and are 3rd party tested there by the VIA in Japan. All 18" ARC-8 wheels have a 690KG load rating. Proper tire fitment: Stretched rubber, narrow tires, and fender rubbing are not elements to look for in a competitive wheel/tire setup. The ARC-8 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 fitments: Most BMW’s come with a staggered setup. 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 in addition to costs. The E9X M3 benefits from being able to fit both square and staggered setups with relative ease. 9.5” or 10” 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 3 series models for track use due to the significant increase in front grip and turn in response. Some E9X M3 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. 10” and 10.5” wheels are available for rear fitment. These can be combined with 9.5” or 10” fronts for a bolt-on spacer free staggered setup. BBK clearance: Many owners install Big Brake kits on their cars. Having an 18” wheel that can clear large calipers is a must. Due to the low offset nature of the E9X M3, there are no clearance issues with the concave spokes of the ARC-8 wheel. Barrel clearance was increased during the design phase to accommodate StopTech’s 380mm kit. The only kit that poses an issue at this time is the 380mm Brembo setup. Meeting the needs of Daily/Street use: Aesthetic design: Although the ARC-8 put function over form when meeting the above requirements, there is no denying that concave mesh wheels look at home on a BMW. Paint finishes: All the wheel have a multi-coat painted finish including a full clear coat except for the Satin finish which does not have a clear (that would have made it gloss black). To give owners more options the wheels are offered in 4 different finishes. Hyper Silver, Hyper Black, Anthracite, and Satin Black. Not everyone wants their track day wheels to be grey. Abuse of street use: The world is full of pot holes and random things to run over. APEX wheels have an excellent history of handling abuse. To date we’ve only had one wheel with a minor bend and another with a hair line crack on the inner barrel lip. Both these wheels came from the same dedicated race car, and the bent wheel is still out there racing today. Multiple fitments: Due to the more conservative nature of street use, the ARC-8 wheel is also available in sizes that can fit more street oriented rubber, at offsets that are an easier fit. Wider more aggressive wheels can be used by those who like a more flush/filled out look. The choice is yours. Certification: The race track has no wheel strength requirements, but the street does. Sadly the USA has very lenient/minimal regulations of wheel strength, unlike like Japan and Germany. APEX wheels are independently tested by the Vehicle Inspection Association of Japan (VIA) to the JWL standard. Wheels tested to the JWL standard require all wheels on the road to meet specific load rating requirements based on the bolt pattern, and dimensions of the wheel, the application/vehicle model has nothing to do with it. In comparison, wheels tested to the SAE standard in the USA can pick their own load rating, which can be as low as they want. This defeats the purpose of the test, as a wheel manufacturer can choose to underrate their wheels in order to reduce wheel weight. Wheels claiming JWL testing, but no 3rd party verification are prone to certifying untested/unproven wheels. VIA certification can not be done in house. It requires sending wheels/tires to japan for crush testing. Sadly a large number of vendors claim their wheels are VIA, JWL and even TUV certified, when in fact they were never tested by those organizations at all, and in some cases don't even meet the standard requirements of those tests. For this reason the certificate numbers for the ARC-8 wheels have been listed below. Self regulate the market, and ask all vendors to back up their claims. If they were tested, then they'll have the registration numbers. 18x9.5” ET35 : VIA15-0461 18x9.5” ET22 : VIA15-0461 18x10” ET25 : VIA15-0462 18x10.5” ET27 : VIA15-1388 17X8.5" ET20 : VIA-17-0259 17X10" ET25 : VIA-17-0262 17X10.5 ET27 : VIA-17-0263 Quote:
Wheel/Tire size recommendations Square Setup 18x9.5" Front & Rear with 275/35/18 18x10" Front & Rear with 275/35/18 - Preferred setup 18x10" Front & Rear with 285/30/18 Staggered Setups 18x9.5" Front 265/35/18 - 18x10/10.5" Rear 275/35/18 18x9.5" Front 265/35/18 - 18x10/10.5" Rear 285/35/18 or 285/30/18 18x9.5" Front 275/35/18 - 18x10/10.5" Rear 285/35/18 18x9.5" Front 265/35/18 - 18x10.5" Rear 295/30/18 or 295/35/18 18x9.5" Front 275/35/18 - 18x10.5" Rear 295/35/18 18x10" Front 275/35/18 - 18x10/10.5" Rear 285/35/18 Rear 18x10" Front 275/35/18 - 18x10.5" Rear 295/35/18 – Preferred setup Photo Threads for ARC-8 wheels: White E92 M3 with Hyper Silver http://www.m3post.com/forums/showthread.php?t=374157 SilverStone E92 M3 with Satin Black http://www.m3post.com/forums/showthr...ighlight=arc-8 Jerez Black E90 M3 with Satin Black http://www.m3post.com/forums/showthr...ighlight=arc-8 VS Motors E46 M3 with Satin Black http://www.m3post.com/forums/showthr...ighlight=arc-8 Silver E92 M3 with Satin Black and 275 R-comps http://www.m3post.com/forums/showpos...4&postcount=23 White E92 M3 with Satin Black http://www.m3post.com/forums/showthr...highlight=apex and http://www.m3post.com/forums/showthr...highlight=apex Blue E90 M3 with Satin Black http://www.m3post.com/forums/showpos...3&postcount=24 and http://www.m3post.com/forums/showpos...1&postcount=39 APEX Official Wheel Gallery http://www.m3post.com/forums/showthr...ighlight=arc-8 **UPDATES TO COME**
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Wheels /// Accessories /// Vehicle-Specific Fitment Guides /// Careers /// Project ML-10 Survey Last edited by Eddy@ApexWheels; 03-02-2012 at 01:38 PM.. |
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01-07-2011, 07:28 PM | #3 | |
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Going too wide with a tire on a narrow wheel pulls the sides up effectively making the tread narrower. The sidewall doesn't have the support it needs so it's sloppy when changing directions, and the taller OD of the tire negatively effects gearing. Extra rubber doesn't guarantee a better setup. Toyo measured their 305/35/18 on an 11" wheel. The R888 runs really wide. For some other 3 series fitments 275 NT-01's would fit but the R88 would not. I would venture to guess that the 305 NT-01 would be an easier fit on the 10.5" wheel, but rubbing is still very much a possibly. It's not really possible to go from a 265 street tire to a 305 r-compound without some kind of compromise.
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01-08-2011, 12:39 PM | #4 |
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The 10.5's just might be the answer to get my car balanced properly for the track.With a 10" square setup,it is too loose once the tires warm up to really attack.I will have to see what tires are available to myself locally that will work well.I am thinking a 275- 295 or a 285 -295 setup.Time to start some research.
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01-08-2011, 01:16 PM | #5 | |
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Since you already have the 10" 275 setup, the better choice would be to figure out what 285, 295 tire you could run out back.
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01-08-2011, 01:23 PM | #6 | |
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01-08-2011, 01:26 PM | #7 | |
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01-10-2011, 03:26 PM | #10 |
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Really? Just when I had decided to go square with these at 10"... What tires are you using? Track temps, session lengths, etc?
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01-10-2011, 03:58 PM | #11 | |
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Most everyone I know tracks their car with a square setup (e30 to e90). Even a 275 is a lot of rear tire, especially if it's an r-compound. The one E90 m3 that competed in the 25 hours of thunderhill ran a square setup. And two other BMW's that ran our APEX wheels in that even were on 10" square setups as well. Staggered setups on this car will not have the oversteer feeling of a square setup, but you will not be able to rotate your tires, which can be costly for some.
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01-10-2011, 04:09 PM | #12 | |
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I will probally run both a 10" and 10.5" rear depending on which track I will be running and If I am competing in Time Attak's.My tire selection is totally up in tha air at this point but I thinh a larger rear footprint is a good idea for my agressive driving style. |
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01-14-2011, 01:05 PM | #13 |
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I have a couple questions:
1) Whats the warranty on these wheels, particularly the paint finish. I have had a couple wheels with paint issue within a year of buying. 2) For a street setup (more than likely staggered) what do you recommend? If you are running the 10+ wheel sizes (front or back) are there issues with a modest drop? For instance the 10 front/10.5 rear plus lowering springs?
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01-14-2011, 07:56 PM | #14 | |
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to date only one wheel was returned for a paint related issue. It was sent back immediately after receipt due to a very minor paint mark most likely caused by shipping packaging. That wasn't even a warranty replacement as that was taken care of in the first 2 days of receipt. No other wheels have ever had a paint issue to date, and they see all sorts of abuse. 2) fitment on a lowered vehicle will depend entirely on the tire size you want to run and what type of tire it is. For a dedicated street setup, I'd get the 9.5" setup for the front and run a 265. The 10's are really more advantages for the track, as they share the same concavity as the 9.5's (no aesthetic advantage to a 10" front over the 9.5" front). On the back it will again depend on the tire size/type.
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01-15-2011, 08:53 AM | #15 | |
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Thanks for the reply, does the 10.5 have an advantage in concavity or look over the 9.5/10?
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01-15-2011, 12:12 PM | #16 |
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9.5/10/10.5 have the same concavity
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01-15-2011, 12:45 PM | #17 |
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Ok so would I be better off going 9.5 F / 10.5 F for traction in the back or 9.5 F / 10 F for the weight savings on Tire and Wheel? Sorry I dont usually have this many options haha.
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01-15-2011, 12:47 PM | #18 |
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I'm running a square APEX ARC-8 10" wheel and 275/35 18 set up and I love it. The car feels perfectly balanced. That said, like Gearhead999s I've been thinking of trying to get a little more rear-end grip by running a 285 or 295 on the back. Will running wider tires on the 10" rim make a measurable difference, or do I need to run the wider tires in conjunction with the wider 10.5" wheel to see a difference?
Last edited by R A W L S; 01-16-2011 at 01:59 AM.. |
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01-15-2011, 07:31 PM | #19 |
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you wrote "F" each time and never an "R". So I don't misinterpret, could you confirm that you're asking about 9.5F/10.5R vs. 9.5F/10R
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01-16-2011, 09:42 AM | #20 |
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Lol wow I should proof read my posts. Yeah that was F / R not F / F
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01-17-2011, 06:12 PM | #21 |
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I would recommend you go the 9.5/10.5 route as your car can easily handle the 10.5" rear.
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01-18-2011, 12:01 PM | #22 |
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