Gates 37021P | Alternator Decoupler Pulley

Part Number
DriveAlign Overrunning Decoupler Pulley

Fits: 04-06 BMW 325i, 04-06 BMW 330i, 04-07 BMW 525i, 04-07 BMW 530i, 04-09 BMW Z4, 06 BMW 330xi, 06-07 BMW 525xi, 06-07 BMW 530xi, 07-13 BMW 328i, 07-08 BMW 328xi, 07-10 BMW X3, 07-10 BMW X5, 08-13 BMW 128i, 08-10 BMW 528i, 08 BMW 528xi, 09-13 BMW 328i xDrive, 09-10 BMW 528i xDrive, 11 BMW 323i
Special Price $70.55 Regular Price $83.00
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DriveAlign Overrunning Alternator Decoupler Pulley (ADP)

Gates DriveAlign Alternator Decoupler Pulleys allow the alternator to "free-wheel" or "overrun" every time the engine decelerates and provide vibration isolation within the accessory belt drive system. This results in smoother engine performance, efficiency and increased belt and component life. The line consists of overrunning alternator decoupler pulleys and one-way clutches (not interchangeable).


  • Exact OE replacement
  • Patented design unmatched by any other supplier
  • Chosen by OEM to reduce noise, vibration and harshness and improve fuel economy


Bore Diameter:14.5
Contact Surface:V-Ribbed Grooved
Contents:Pulley, Dust Cap
Description:One-Way Clutch Decoupler Pulley
Groove Quantity:6
Installation Tools Requirements:91024-1
OE Comparison Rating:OE Exact
Outside Diameter:49


  • ACDelco: 37021P
  • BMW: 12317516103
  • BMW: 12317552353
  • BMW: 12317560483
  • Carquest: 37021P
  • Goodyear: 49722
  • Lester: 7920-2094
  • Litens: 930007A
  • NAPA Belts/Hose: 37021P
  • Tendeco: 930007


  • 2004-2005 BMW 325i
  • 2004-2009 BMW Z4
  • 2006 BMW 330xi        Note: W/Bosch Alt.
  • 2006-2007 BMW 525i        Note: W/Bosch Alt.
  • 2006-2007 BMW 525xi        Note: W/Bosch Alt.
  • 2007 BMW 328xi        Note: W/Bosch Alt.
  • 2007-2010 BMW X3
  • 2008-2013 BMW 128i
  • 2008-2013 BMW 328i
  • 2008 BMW 328xi
  • 2009-2013 BMW 328i xDrive
  • 2009-2010 BMW 528i xDrive
  • 2011 BMW 323i
  • 2004-2006 BMW 330i        Note: W/Bosch Alt.
  • 2004-2005 BMW 525i
  • 2004-2007 BMW 530i        Note: W/Bosch Alt.
  • 2006 BMW 325i        Note: W/Bosch Alt.
  • 2006-2007 BMW 530xi        Note: W/Bosch Alt.
  • 2007 BMW 328i        Note: W/Bosch Alt.
  • 2007-2010 BMW X5
  • 2008-2010 BMW 528i
  • 2008 BMW 528xi

Customer Questions
What types of automotive products does Gates offer?
Gates offers a wide range of automotive products, including belts, hoses, tensioners, and more.
I'm looking for a replacement belt for my vehicle. Can you help me understand the different options available from Gates and recommend the best one for my specific make and model?
Yes, Gates offers a range of replacement belts for various applications. To find the best one for your specific make and model, it is recommended to consult the Gates website or reach out to their customer support.
Are there any specific maintenance for Gates products?
Yes, there are specific maintenance and installation guidelines to follow when using Gates products to ensure optimal performance and longevity.
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