Roadmax 4K355AP Serpentine Belt

Roadmax 4K355AP Serpentine Belt Overview

The Roadmax 4K355AP is a standard automotive V-ribbed belt built for accessory drive service where dependable operation matters more than premium-performance features. Made with EPDM and polyester cord reinforcement, it is a practical choice for vehicles that need stable belt tracking and consistent drive performance.

Compatible With Mercedes-Benz G550, C63 AMG, E63 AMG, G63 AMG, GLC63 AMG, S560, AMG GT, and other listed applications, this belt also cross-references Gates K040355 for the same application.

Key Features

• Part number: 4K355AP
• Brand line: Roadmax Automotive V-Ribbed Belt (Standard)
• EPDM construction for everyday accessory drive service
• Polyester cord material for belt stability
• 4-rib design for serpentine drive applications
• Top width: 14 mm (.56 in.)
• Effective length: 903 mm (35.56 in.)
• Outside circumference: 918 mm (36.125 in.)
• Cross section designation: K

Product Details

Roadmax positions this belt line for budget-conscious buyers who want a quality replacement without stepping up to a premium belt specification. The 4K355AP uses EPDM rubber and polyester reinforcement to support accessory drive operation in a wide range of import and domestic applications. It is a standard V-ribbed belt for alternator, power steering, air conditioning, and water pump drive layouts where the listed fitment matches the vehicle configuration.

Fits 2020-2022 Mercedes-Benz G550, Alternator; fits 2016-2017 Mercedes-Benz G550, Alternator; fits 2016-2021 Mercedes-Benz C63 AMG, Alternator; fits 2015-2021 Mercedes-Benz C63 AMG S, Alternator; fits 2020-2021 Mercedes-Benz E63 AMG, Alternator; fits 2018-2021 Mercedes-Benz E63 AMG S, Alternator; fits 2019-2021 Mercedes-Benz G63 AMG, Alternator; fits 2020-2021 Mercedes-Benz GLC63 AMG, Alternator; fits 2018 Mercedes-Benz GLC63 AMG, Alternator; fits 2020-2021 Mercedes-Benz GLC63 AMG S, Alternator; fits 2018 Mercedes-Benz GLC63 AMG S, Alternator; fits 2018-2021 Mercedes-Benz S560, Alternator; fits 2018-2021 Mercedes-Benz S63 AMG, Alternator; fits 2018-2020 Mercedes-Benz Maybach S560, Alternator; fits 2020 Mercedes-Benz Maybach S650, Alternator; fits 2018-2019 Mercedes-Benz AMG GT, Alternator; fits 2019 Mercedes-Benz AMG GT 63, Alternator; fits 2019 Mercedes-Benz AMG GT 63 S, Alternator; fits 2018-2019 Mercedes-Benz AMG GT C, Alternator; fits 2018-2019 Mercedes-Benz AMG GT R, Alternator; fits 2018-2019 Mercedes-Benz AMG GT S, Alternator.

Common Issues This Belt Can Address

• Cracked or glazed accessory drive belt surfaces
• Squealing from a worn serpentine belt
• Loss of alternator drive performance
• Uneven belt tracking on the accessory drive system
• Replacement needs for power steering, air conditioning, or water pump belt service on listed vehicles

Installation Notes and Tips

Verify belt length, rib count, and engine accessory routing before installation. Confirm the vehicle’s exact configuration, since some listed Mercedes-Benz applications include notes such as W/O Active Suspension or W/O A.C. Use the vehicle’s belt routing diagram and inspect pulleys, tensioners, and idlers for wear before installing the new belt. For fitment searches, this part number is commonly referenced as 4K355AP and Roadmax 4K355AP.

Quality Assurance

Roadmax markets this standard belt line as a value-focused replacement option for customers who want dependable quality without premium-belt performance pricing. The EPDM construction and polyester cord reinforcement support consistent service in the applications listed above.