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M2 Technical Topics > Suspension | Brakes | Chassis > Stoptech 2-Piece Aero Rotor Kit ARK for your F87 M2

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      03-14-2017, 12:14 PM   #1
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Stoptech 2-Piece Aero Rotor Kit ARK for your F87 M2

StopTech® AeroRotor® Replacement Kits (ARK) are designed to replace your vehicle's original factory rotors, while retaining the factory brake calipers. Although the ARK is the same diameter and thickness as the factory rotors, it offers improved cooling, braking, and handling.

The directional, floating AeroRotors allow independent expansion of the rotor and hat without "coning," thanks to elongated drive pin holes. ARK components include AeroRotor friction rings with patented internal vane design, pre-assembled to billet aluminium AeroHats with directional stand-offs that optimize cooling airflow.

The patented AeroRotor vane design pushes up to 80% more air than factory rotors for better cooling and reduced fade on the track.

The aircraft-grade aluminum hats and 2-piece AeroRotors are up to 8 pounds lighter than stock rotors, allowing faster acceleration and deceleration, and improved handling.

StopTech AeroRotors are available slotted or cross-drilled. These slots or holes allow better dissipation of heat, friction material and debris, assuring that fresh pad material is in contact with the rotor every time the brakes are applied. An optional anti-corrosion, zinc finish is available for customers in cold climates, where salt and chemicals are used to melt snow and ice. The zinc coating also benefits customers who prefer no visible surface rust on the vanes and outer circumference of the rotors.

StopTech AeroRotors are 100% made in the USA.



StopTech AeroRotor Rings

The patented 2-piece AeroRotor assembly uses uniquely designed and patented AeroVanes® inside the disc to optimize airflow through the rotor. This improved directional design minimizes turbulence and flows up to 61 percent more air than any other rotor tested. The result is up to 80 percent better airflow over original equipment rotors and 10-30 percent better airflow than other directional vane racing rotors currently available. Better airflow equals better cooling, and better cooling means less fade and better overall brake system performance.
StopTech AeroRotors also feature a proprietary alloy chemistry. By adding molybdenum to the gray iron, carefully targeting a narrow range of hardness and tensile strength values, and controlling the cooling rate of the rotor after casting, StopTech produces a friction ring with added crack resistance as well as improved functionality.


Super strong Inconel® drive pin washers - as used in aircraft engines and other racing applications - are practically impervious to oxidation or corrosion even at extreme temperatures.
Street rotors use a curved drive pin washer to add tension to the hat assembly, reducing rattle. Race applications use a flat washer that allows full freedom of movement between hat and friction ring.
StopTech AeroHats feature directional stand offs to further improve airflow and cool the rotor.



Elongated drive pin slots allow separate expansion of rotor and hat to resist coning.
Tapered slots allow evacuation of debris that might otherwise accumulate with straight-cut slots.
Drive pins used to affix the hat to the rotor have a slightly out-of-round hole and are self-locking. They withstand high temperatures much better than typical lock washers and allow drive pins to move freely, yet securely, as hat and rotor expand at different rates.


Drive Pins

In certain applications where packaging is an issue - such as on the Chevrolet Corvette - StopTech uses slant-head drive pins to provide improved clearance as pads wear.


Zinc Plating

Zinc Plating, available on StopTech AeroRotors, prevents corrosion. This is particularly useful in winter climates where road salt and other environmental factors may increase the likelihood of oxidation.

Front axle only

380 x 30 mm weighing in at 23.8 lbs.

Stoptech ARK Aero Rotor Kit

81.B38.9911 slotted
81.B38.9921 drilled

For more information:

http://www.hpashop.com/Stoptech-Aero...h-Aero-F8x.htm
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Last edited by HP Autosport; 10-29-2019 at 11:50 AM..
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      04-12-2017, 11:49 PM   #2
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Are the stock F87 front rotors directional? Or are the internal vanes straight and the same p/n used on both sides?

I ask because I want to make sure BMW didn't pull an Audi here... the TTRS has directionally vaned front rotors... but they didn't spend the money to develop a proper left and right side part number. Both sides use the same part, but the vanes are only spinning the correct direction on the left side of the car.

They took this nice set of 4-pot Brembo calipers and slapped those around the garbage rotors (which look very similar to the BMW rotors visually - 2-piece appearance but actually connected together). Guys end up with brake shudder / "warping" because the right side rotor overheats/hotspots, pads leave deposits, and there you go.
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      04-13-2017, 11:08 AM   #3
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Quote:
Originally Posted by ZPrime View Post
Are the stock F87 front rotors directional? Or are the internal vanes straight and the same p/n used on both sides?

I ask because I want to make sure BMW didn't pull an Audi here... the TTRS has directionally vaned front rotors... but they didn't spend the money to develop a proper left and right side part number. Both sides use the same part, but the vanes are only spinning the correct direction on the left side of the car.

They took this nice set of 4-pot Brembo calipers and slapped those around the garbage rotors (which look very similar to the BMW rotors visually - 2-piece appearance but actually connected together). Guys end up with brake shudder / "warping" because the right side rotor overheats/hotspots, pads leave deposits, and there you go.
Yes, M2/3/4 rotors are directional.

None M BMW Performance or OEM Sport rotors aren't, even though they are slotted. We have seen that with Corvettes as well, same rotors left and right and vanes going the wrong way. :thumb down M division got it right though!
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      04-13-2017, 11:28 AM   #4
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I see these are zinc plated; will these rotors address the rust issues we have on the OEM rotors other than the zinc plating?

Are these good as an all purpose rotor; street and track?

Any chance these will be available for the rear rotors in the future?

Thank you
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      04-13-2017, 11:41 AM   #5
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Quote:
Originally Posted by M2 Blur View Post
I see these are zinc plated; will these rotors address the rust issues we have on the OEM rotors other than the zinc plating?

Are these good as an all purpose rotor; street and track?

Any chance these will be available for the rear rotors in the future?

Thank you
Zinc plating will help with rust and oxidation issues. Where do you find rust on your OEM rotors?

Yes, these are good for both street and track use. You will have much better cooling and shave off some unsprung weight.

We have spoke to Stoptech a few times and they have no plans to make the rears anytime soon.
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      04-13-2017, 12:49 PM   #6
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Quote:
Originally Posted by HP Autosport View Post
Quote:
Originally Posted by M2 Blur View Post
I see these are zinc plated; will these rotors address the rust issues we have on the OEM rotors other than the zinc plating?

Are these good as an all purpose rotor; street and track?

Any chance these will be available for the rear rotors in the future?

Thank you
Zinc plating will help with rust and oxidation issues. Where do you find rust on your OEM rotors?

Yes, these are good for both street and track use. You will have much better cooling and shave off some unsprung weight.

We have spoke to Stoptech a few times and they have no plans to make the rears anytime soon.
Thanks for the info.

Rust reports are here:
http://f87.bimmerpost.com/forums/sho....php?t=1362623
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      04-13-2017, 03:16 PM   #7
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Quote:
Originally Posted by M2 Blur View Post
Thanks for the info.

Rust reports are here:
http://f87.bimmerpost.com/forums/sho....php?t=1362623
That rust is the hub, not the rotor itself.
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