Roadmax 6K660AP Serpentine Belt

Roadmax 6K660AP Serpentine Belt Overview

The Roadmax 6K660AP is an automotive V-ribbed belt built for drivers who want a practical replacement belt with dependable construction. Made from EPDM with a polyester cord, it is sized as a 6-rib serpentine belt for accessory drive applications on select Lexus, Buick, Chevrolet, Audi, and Pontiac vehicles.

Roadmax’s standard belt line focuses on value-oriented replacement parts for everyday service work. The 6K660AP follows that approach with a conventional OE-style design for vehicles that need a direct-fit accessory drive belt without stepping up to a premium performance belt.

Key Features

• Part number: 6K660AP
• Automotive V-ribbed belt, standard type
• EPDM construction for modern accessory drive service
• Polyester cord material for belt stability
• 6-rib design
• Top width: 20 mm (.807 in.)
• Effective length: 1681 mm (66.19 in.)
• Outside circumference: 1696 mm (66.757 in.)
• Cross section designation: K

Detailed Description

The Roadmax 6K660AP serpentine belt is designed for accessory drive systems that route power to engine-driven components such as the alternator, power steering pump, and air conditioning compressor, depending on vehicle configuration. Its EPDM belt material is suited to routine underhood service, while the polyester cord helps maintain belt shape and tension consistency. This part cross-references Gates K060660 and Dayco 5060660 for the same application.

Use the 6K660AP when servicing select Lexus IS300, RC300, GS300, GS200t, IS200t, and RC200t models, as well as Buick Cascada, Chevrolet Astra, Audi 90, Audi 90 Quattro, and Pontiac Fiero applications listed below. The fitment data also includes 2022 Lexus IS300 and 2018-2020 Lexus IS300, making this belt relevant for multiple model years across the confirmed vehicle list.

Vehicle Fitment

• Fits 2022 Lexus IS300, N/A
• Fits 2018-2020 Lexus IS300, N/A
• Fits 2018-2020 Lexus RC300, N/A
• Fits 2016-2019 Buick Cascada, N/A
• Fits 2018-2019 Lexus GS300, N/A
• Fits 2016-2017 Lexus GS200t, N/A
• Fits 2016-2017 Lexus IS200t, N/A
• Fits 2016-2017 Lexus RC200t, N/A
• Fits 2004-2006 Chevrolet Astra, Accessory Drive
• Fits 2001-2003 Chevrolet Astra, N/A
• Fits 1993 Audi 90, N/A, W/O A.C.
• Fits 1993 Audi 90 Quattro, N/A, W/O A.C.
• Fits 1987-1988 Pontiac Fiero, N/A, W/A.C.

What This Belt Helps Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or rib wear on the existing serpentine belt
• Loss of belt grip that can affect accessory operation
• Service replacement for scheduled belt maintenance
• Fitment needs on confirmed Lexus IS300 and RC300 applications

Installation Notes and Tips

Verify belt routing against the vehicle’s accessory drive diagram before installation. Confirm the effective length and rib count match the original belt specification, especially on Lexus IS300, RC300, and Buick Cascada applications where engine and accessory layouts can vary by configuration. Inspect pulleys, tensioners, and idlers for wear before installing the new belt so the replacement can run smoothly.

Quality Assurance

Roadmax positions the Automotive V-Ribbed Belt (Standard) line as a quality-focused, budget-conscious replacement option. The 6K660AP uses EPDM and polyester cord construction to meet the needs of routine accessory drive service without moving into a premium belt category.