big-brake-kits

StopTech - Drilled Aero-Rotor Kit Front (81.B39.9921)

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This part fits

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

Part #: 81.B39.9921

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.

More Details

PositionFront
StyleDrilled

See what our community says about stoptech products

Nicholas Lapane

522

Nicholas Lapane
2006 Acura TL
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What made you choose this particular product?
Used them before and they makes good products
Is this your first time buying from this brand? Did you consider other brands?
no
Was it easy to install? Any installation tips that will help others?
simple brake job
View on Nicholas'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?
Stoptech is a reputable brand.
Is this your first time buying from this brand? Did you consider other brands?
Yes its my first time.
View on Kyle'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?
They are supposed to be good, we'll find out if they are.
Is this your first time buying from this brand? Did you consider other brands?
Yes
View on Julian'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?
Price, no dust or noise.
Is this your first time buying from this brand? Did you consider other brands?
First time, I did consider Hawk
View on Troy'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?
the price and the performance
Is this your first time buying from this brand? Did you consider other brands?
no second time, i liked how they didn't dust as much and had good pedal feel
Was it easy to install? Any installation tips that will help others?
yes very, took a few hours
Once you've had a chance to use the product, did it meet your expectations?
yes, they stop and last a long time
View on Gabe's build
California prop 65 warningWARNING: Cancer and Reproductive Harm www.p65warnings.cs.gov

*Some manufacturer restrictions apply.

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Matt Farah

Smoking Tire / The Drive

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Thank you for all the help, really. You guys are awesome. This is all great info and I really appreciate everything you have done to help me with my build.

James M.

Ford Focus ST

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Your customer service is wonderful. Thank you for taking care of this. My review will express all. Thank you!

Wallace R

Chevrolet Silverado 1500