2026 WESTERN STAR 57X

57X — WESTERN STAR X-SERIES ON-HIGHWAY TRUCK Born from the driver’s need for increased efficiency, safety, and comfort. Purpose-built to redefine what a highway truck should be.Introducing the 57X, the newest member of the Western Star X-Series family and the most advanced and driver-focused highway truck we’ve ever built.Built on a history of toughness and equipped with technology, comfort, safety and efficiency that rewards you every time you get behind the wheel and when you check your bottom line.CABTHE MOST DRIVER-FOCUSED TRUCK ON THE ROADMaking life easier for those who drive our trucks is always high on the priority list, so we’ve taken cab life a serious leap forward. It begins with our new digital dash display: bright, clear, customizable and intuitive. Then there’s the driver’s lounge in back. Equally as customizable, it’s easily spec’d out with optional features including a flat-screen TV, refrigerator, dinette, a full-size Murphy-style bed and more.EFFICIENCY(AERODYNAMICS AND POWERTRAIN)ADVANCED AERODYNAMICS AND GREATER FUEL EFFICIENCYWe’ve pushed the laws of aerodynamics to the max and these advancements, coupled with the latest powertrain technologies, have come together seamlessly to deliver the most fuel-efficient highway truck we’ve ever made.DIGITAL DASHCREATED TO MAKE DRIVING EASIERA 12" A-panel display and 10" B-panel display provides access to all the data and entertainment you need, without your hands ever leaving the wheel.CONNECTIVITYMORE DATA MEANS MORE UPTIMEOur X-Series trucks represent a big advancement in productivity for Western Star trucks thanks to Detroit Connect®. Detroit Connect translates the performance data of any type of truck into real-time information you can use to make decisions that can help you keep those trucks on the road and earning.CHASSISENGINEERED TO PERFORMThe 57X rides on a durable Daimler corporate chassis, backed by millions of miles of proven performance.DOORSENGINEERED FOR THE LONG HAULSteel-reinforced aluminum with internally mounted hinges for greater durability and no sagging.MIRRORSFORM AND FUNCTION WORKING TOGETHEROur C-Bar Mirror System was created for maximum stability and aerodynamics to help your drivers and your bottom line.SPECIFICATIONSDIMENSIONS• BBC: 128.5"• WB: Up to 361"• BA: 54.5"AERODYNAMICS• 12" daycab and 24" sleeper side extenders with black flexible ends• 72" and 60" mid-roof aero roof fairing• Daycab aero roof fairing or adjustable aerodynamic deflector• Chassis side fairings with black flexible skirts• Optimized drive wheel fairings• Flow below mold-in color wheel coversENGINES• Detroit® DD13® 370-525 HP, 1250-1850 lb-ft• Detroit® DD15® 425-505 HP, 1550-1850 lb-ft• Detroit® DD16® 500-600 HP, 1850-2050 lb-ftWestern Star provides a wide range of new vehicle engines compliant with EPA, CARB emissions, GHG, and OBD requirements.TRANSMISSIONS• Detroit® DT12® On-Highway Series• Eaton Fuller Manual 10-speed or 18-speedFRAME• 7.0MM X 88.0MM X 279.0MM STEEL FRAME (0.28"X3.46"X10.98") 120 KSI• 8.0MM X 88.0MM X 281.0MM STEEL FRAME (0.31"X3.46"X11.06") 120 KSI• 11.0MM X 85.0MM X 287.0MM STEEL FRAME (0.43X3.35X11.30 INCH) 120 KSIPOWER TAKE-OFFS (PTOS)• Intuitive and simple to use PTO control system that makes programming easy• Optional Factory installed transmission PTO’s availableAXLESFRONT• Detroit® 12,000-14,700 lbs• Meritor 12,000-13,300 lbs• Hendrickson STEERTEK NXT 12,000-13,300 lbsREAR• Detroit® single 21,000-23,000 lbs• Detroit® tandem 40,000-46,000 lbs• Meritor single 21,000-23,000 lbs• Meritor tandem 40,000-46,000 lbs• Dana tandem 46,000 lbsSUSPENSIONSFRONT• Taperleaf 12,500-14,600 lbs• AirLiner® 12,500-13,300 lbs• Hendrickson AIRTEK 12,500-13,300 lbsREAR• AirLiner® single 21,000-23,000 lbs• AirLiner® tandem 40,000- 46,000 lbsBRAKES• Drum Brakes• Air Disc Brakes• WABCO® Anti-lock Braking System (ABS) and optional Hill Start Aid and Traction ControlTANKSFUEL• Aluminum 25" cylindrical, plain or polished• LH/RH 60-150 gallon (227-568 liter)• LH and RH split fuel/hydraulic tank options availableDEF• 13- and 23-gallon (49- and 87-liter)REWARD YOURSELF WITH A BOLD STATEMENTThe X-Series has expanded again, this time elevating the concept of what a premium on-highway truck should be. Introducing the 57X, the most advanced and most driver focused on-highway truck we’ve ever built. Built on a history of toughness and filled with the technology, comfort and efficiency that rewards you every time you get behind the wheel and every time you check your bottom line. PREMIUM FEATURES• LED projector beam headlights • Integrated daytime running, marker, park and signal lamps• Two-piece aerodynamic painted bumper with integrated air ducts• Impact-resistant, aerodynamic lightweight molded resin hood with locking hood strut• One-piece windshield with optional TufGlass impact resistant windshield• Stainless steel visor with LED marker light• Optimized drive wheel fairings and Flow Below wheel covers• Large 31.5” x 22” sleeper windows• 24-inch side extenders with black flexible ends• Chassis side fairings with black flexible skirts• Spacious integrated X-Series sleepers• Best-in-class HVAC with cab and sleeper outlets• Optional idle-free battery operated dual HVAC system• Optional Premium and Extreme Climate insulationSpecifications are subject to change without prior notice. Similar models may be shown in addition to the featured model. Equipment may be shown with options.