Dayco 5070730 | Serpentine Belt

Part Number
Serpentine Belt

Fits: 07-12 BMW 335i, 07-08 BMW 335xi, 08-13 BMW 135i, 08 IC Corporation CE Commercial, 08-09 IC Corporation CE Integrated, 09-12 BMW 335i xDrive, 11 BMW 1 Series M, 11-13 BMW 335is, 13-15 BMW X1

Special Price $40.79 Regular Price $47.99
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Estimated Ship Date: 1 Business Day or Less
Designed for high mileage multiple-accessory drivesthe Dayco® “W” profile belt (patent pending) is the most innovative advancement in multi-rib belt design in over 25 years. Developed through extensive laboratory and actual road mileage testing, this unique rib profile has been specifically Dayco® engineered to conform to high mileage, worn or misaligned drives without a sacrifice in quiet, long-lasting performance. The "W" profile cut into the tip of each rib makes the tip more flexible and eliminates belt chirp when the belt enters a worn or misalligned pulley. Constructed with Aramid reinforced EPDM compounds, the Dayco® “W” profile belt delivers more than OE required delivers the solution to troublesome drive problems. Dayco® Poly-Rib® Belts meet or exceed SAE J1459 and SAE J2432 specifications.

BRAND: Dayco




Cross SectionK-Section
Effective Length1854.97
Effective Length73.03
MaterialEPDM, Aramid Reinforced
Maximum Operating Temperature212
Maximum Operating Temperature100
Minimum Operating Temperature-45
Minimum Operating Temperature-42.7
Outside Circumference73.59
Outside Circumference1869.19
Rib DepthStandard
Rib ProfileStraight Rib
StandardsSAE J1459, SAE J2432
Top Width.96

73 1/2 In. Belt O.C.



  • Goodyear: 4070730
  • Gates: K070730
  • Goodyear: 4070732
  • BMW:
  • CARQUEST: K070730
  • ACDelco: 7K730
  • NAPA: 25-070730
  • BMW:
  • Duralast: 730K7
  • BMW:
  • Driveworks: 730K7


  • 2008-2009 IC Corporation CE Integrated - Position: Main Drive
  • 2008-2008 IC Corporation CE Commercial - Position: Main Drive
  • 2007-2008 BMW 335xi - Position: Main Drive
  • 2011-2013 BMW 335is - Position: Main Drive
  • 2013-2015 BMW X1 - Position: Main Drive
  • 2009-2012 BMW 335i xDrive - Position: Main Drive
  • 2008-2013 BMW 135i - Position: Main Drive
  • 2007-2012 BMW 335i - Position: Main Drive
  • 2011-2011 BMW 1 Series M - Position: Main Drive
Customer Questions
Can a serpentine belt cause smoke?
Yes, a serpentine belt can cause smoke. A serpentine belt is an essential component of a vehicle's engine system. It drives various accessories such as the alternator, power steering pump, water pump, and air conditioning compressor. If the serpentine belt becomes worn, damaged, or misaligned, it can cause friction and generate smoke.
Why is my serpentine belt squealing?
The serpentine belt can squeal due to various reasons, including tension issues, worn-out belt, or a problem with the belt's pulleys.
Is my serpentine belt too tight?
If your serpentine belt is causing issues like excessive noise or accelerated wear on the pulleys, it may indicate that the belt is too tight.
Why did my serpentine belt come off?
Serpentine belts can come off due to factors such as belt wear, improper tension, misaligned pulleys, or a faulty tensioner.
Please, mind that only logged in users can submit questions

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