Roadmax 4K450AP Serpentine Belt

Roadmax 4K450AP Serpentine Belt Overview

The Roadmax 4K450AP is a standard automotive V-ribbed belt built for accessory drive service where dependable operation matters more than premium-duty performance. Made with EPDM and polyester cord reinforcement, it is sized for specific alternator, power steering, air conditioning, air pump, and water pump applications across a wide range of vehicles.

Roadmax’s Automotive V-Ribbed Belt (Standard) line is aimed at budget-conscious repairs that still call for a quality replacement belt. The 4K450AP follows the common 4-rib K-section layout and is dimensioned for direct replacement use in select Mercedes-Benz, Honda Accord, Toyota 4Runner, Toyota Pickup, and older domestic applications.

Key Features

• EPDM construction for modern accessory drive belt service
• Polyester cord reinforcement for stable belt strength
• 4-rib, K-section design
• Top width: 14 mm (.56 in.)
• Effective length: 1147 mm (45.14 in.)
• Outside circumference: 1160 mm (45.625 in.)
• Standard V-ribbed belt design for everyday replacement needs

Detailed Description

Roadmax 4K450AP is a serpentine belt engineered to match the dimensions and rib profile used in a variety of accessory drive systems. Its EPDM belt material is suited to the heat and wear demands of engine-bay operation, while the polyester cord helps maintain belt stability under load. This part number is also referenced in the market as a replacement for applications calling for K040450 or 4PK1145-style sizing.

Fits 2018-2021 Mercedes-Benz S560, Alternator. Fits 2018-2020 Mercedes-Benz Maybach S560, Alternator. Fits 2020 Mercedes-Benz Maybach S650, Alternator. Fits 2018-2019 Mercedes-Benz G550, Alternator. Fits 2019 Mercedes-Benz S560L, Alternator. Fits 2018 Mercedes-Benz G550 4x4, Alternator. Fits 1995-1997 Honda Accord, Power Steering. Fits 1988-1991 Toyota 4Runner, Air Conditioning and Air Pump. Fits 1988-1991 Toyota Pickup, Air Conditioning and Air Pump.

This part cross-references Gates (e.g., K040450) and Bando (e.g., 4PK1145) for the same application.

Common Problems This Belt Can Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or visible wear on the belt ribs
• Loss of alternator drive performance
• Reduced power steering belt function on listed Honda Accord applications
• Accessory drive issues affecting air conditioning, air pump, or water pump operation on listed vehicles

Installation Notes and Tips

Verify belt length, rib count, and cross-section before installation. Confirm the routing path against the vehicle’s belt diagram and inspect pulleys, tensioners, and idlers for wear before fitting the new belt. For Mercedes-Benz S560, Maybach S560, Maybach S650, G550, and G550 4x4 applications, confirm the alternator-drive configuration and active suspension notes listed in the fitment data.

Quality Assurance

Roadmax positions the Automotive V-Ribbed Belt (Standard) line as a practical replacement option for customers who want quality construction without stepping up to a premium belt tier. The 4K450AP uses EPDM and polyester cord materials to support consistent accessory drive service in the listed applications.