Roadmax 6K721AP Serpentine Belt

Roadmax 6K721AP Serpentine Belt Overview

The Roadmax 6K721AP is an automotive V-ribbed belt built for drivers who want a practical replacement belt without stepping up to a premium performance line. Made with EPDM and polyester cord reinforcement, it is sized for 6-rib accessory drive applications and measures 72.07 inches effective length with a 72.632-inch outside circumference.

Roadmax positions this standard belt line as a value-focused option for everyday service work. The 6K721AP is a direct-fit style serpentine belt for a range of vehicles, including Porsche 718 Boxster, Porsche 718 Cayman, BMW Z4, Ford Taurus, and Mercury Sable applications listed below.

Key Features

• Part number: 6K721AP
• Automotive V-ribbed belt, standard construction
• EPDM belt material for common accessory drive service
• Polyester cord material for reinforcement
• 6-rib design for compatible serpentine drive systems
• Top width: 20 mm (.807 in.)
• Effective length: 1831 mm (72.07 in.)
• Outside circumference: 1845 mm (72.632 in.)

Product Details

This Roadmax serpentine belt is designed around the K cross-section and standard V-ribbed profile used in many accessory drive belt systems. It cross-references common OE and aftermarket numbers such as Gates K060721 and Dayco 5060720 for the same application. If you are servicing a Porsche 718 Boxster or Porsche 718 Cayman, or replacing a belt on a BMW Z4, Ford Contour, or Mercury Mystique, the 6K721AP provides a straightforward replacement option with the correct rib count and length specification.

Roadmax’s Automotive V-Ribbed Belt (Standard) line is aimed at budget-conscious maintenance where a quality replacement is needed and premium belt performance is not required. The EPDM construction and polyester reinforcement support routine accessory drive operation in properly matched applications.

Vehicle Fitment

• Fits 2024 Porsche 718 Boxster, N/A
• Fits 2017-2021 Porsche 718 Boxster, N/A
• Fits 2024 Porsche 718 Cayman, N/A
• Fits 2017-2020 Porsche 718 Cayman, N/A
• Fits 2017 Porsche 911, N/A
• Fits 2006-2011 BMW Z4, N/A
• Fits 2004-2006 Suzuki Verona, N/A
• Fits 1998-2000 Ford Contour, N/A
• Fits 1998-2000 Mercury Mystique, N/A
• Fits 1999 Mercury Cougar, N/A
• Fits 1996-1999 Oldsmobile LSS, Supercharger
• Fits 1996-1999 Pontiac Bonneville, Supercharger
• Fits 1996-1998 Buick Park Avenue, Supercharger
• Fits 1996-1998 Buick Riviera, Supercharger
• Fits 1996 Oldsmobile 88, Supercharger
• Fits 1992-1994 Ford Ranger, N/A
• Fits 1994 Mazda B2300, N/A
• Fits 1989-1992 Ford Taurus, Water Pump, Air Conditioning and Power Steering
• Fits 1989-1992 Mercury Sable, Water Pump, Air Conditioning and Power Steering

Common Replacement Uses

• Replacing a worn or cracked serpentine belt
• Correcting belt noise caused by glazing or age-related wear
• Restoring accessory drive operation on alternator, A/C, or power steering systems
• Servicing supercharger belt applications listed in the fitment data
• Addressing belt length mismatch after prior incorrect part selection

Installation Notes

Verify the rib count, effective length, and outside circumference before installation. Confirm the vehicle application and accessory drive routing against the fitment listing, especially on Porsche 718 Boxster, Porsche 718 Cayman, BMW Z4, and Ford Taurus applications where configuration details matter. Inspect pulleys, tensioners, and idlers for wear before installing the new belt, and replace any damaged components that could shorten belt life.

For vehicles listed with configuration notes such as supercharger, W/A.C., W/O A.C., or water pump, air conditioning and power steering, match the exact engine and accessory setup before ordering or installing the belt.

Quality Assurance

This Roadmax belt uses EPDM construction with polyester cord reinforcement and is part of the brand’s standard automotive V-ribbed belt line. It is built as a practical replacement option for confirmed applications where a standard-duty serpentine belt is appropriate.