big-brake-kits

StopTech 81.B39.9931 - Slotted and Zinc Plated Aero-Rotor Kit Front

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This part fits

  1. 2016 BMW 335i GT xDrive
  2. 2015 BMW 435i xDrive
  3. 2015 BMW 435i Gran Coupe
  4. 2015 BMW 435i
  5. 2015 BMW 435i xDrive Gran Coupe
  6. 2015 BMW ActiveHybrid 3
  7. 2015 BMW 335i xDrive
  8. 2015 BMW 335i GT xDrive
  9. 2015 BMW 335i
  10. 2014 BMW ActiveHybrid 3
  11. 2014 BMW 335i GT xDrive
  12. 2014 BMW 335i xDrive
  13. 2014 BMW 435i
  14. 2014 BMW 435i xDrive
  15. 2014 BMW 335i
  16. 2013 BMW ActiveHybrid 3
  17. 2013 BMW 335i xDrive Sedan
  18. 2013 BMW 335i xDrive Sedan
  19. 2013 BMW 335i Sedan
  20. 2013 BMW 328i xDrive Sedan
  21. 2013 BMW 335i Sedan
  22. 2012 BMW 335i Sedan
  23. show all...
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About this product

Part #: 81.B39.9931

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 aluminum AeroHats with directional stand-offs that optimize cooling airflow. The patented AeroRotor vane design pushes up to 80 percent 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 percent made in the USA.

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See what our community says about stoptech products

Tyler Kuenstler

214

Tyler Kuenstler
2013 Mazda 3
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What made you choose this particular product?
Performance
What were you trying to accomplish by adding this product?
Cooler brake temps, better late braking capabilities, and less brake fade
Was it easy install? Any installation tips that will help others?
Easy install
Once you’ve had a chance to use the product, did it meet your expectations?
Great brake package. Would highly recommend
View on Tyler's build
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What made you choose this particular product?
Price and Performance
What were you trying to accomplish by adding this product?
Braking performance and handling
Was it easy install? Any installation tips that will help others?
DIY.
Once you’ve had a chance to use the product, did it meet your expectations?
Absolutely!
Any additional comments?
None to report
View on Jason's build
Andrew de Vries

560

Andrew de Vries
1989 Ford Mustang
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Slotted, quality
Was it easy install? Any installation tips that will help others?
Yes
Once you’ve had a chance to use the product, did it meet your expectations?
Fantastic
View on Andrew's build
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What made you choose this particular product?
I wanted an upgrade from stock without going crazy. These seemed like the best balance of performance and economy.
What were you trying to accomplish by adding this product?
Add more stopping power and replace worn factory parts.
Was it easy install? Any installation tips that will help others?
I had it professionally installed. I don't trust myself with brake work.
Once you’ve had a chance to use the product, did it meet your expectations?
So far they're incredibly effective and still quiet.
View on Sean's build
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Looking at Plain vs Slotted vs Drilled vs Drilled and slotted I chose Slotted. They're the most effective choice in braking. They're also vented.
What were you trying to accomplish by adding this product?
Improved braking and cooling of the rotors.
View on Joey's build
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