Published specifications49X
vocational, heavy-spec, construction and severe-service work
Bumper to back of cab (BBC)121.5 in3,086 mm
2021 factory brochure
Open reference sheetTHE TRUCK REFERENCE DESK
Western Star
tractor specifications.
Explore Western Star model families, published dimensions and powertrain references. Follow each figure back to its source and the configuration it describes.
Browse 4 model familiesSTART WITH THE BADGE
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MODEL INDEX
Western Star reference sheets
4 of 4 model families
Published specifications
Published specifications57X
premium aerodynamic highway and long-haul work
DD13 Gen 5 power370–525 hp276–391 kW
DD13 Gen 5 torque1,250–1,850 lb-ft1,695–2,508 N·m
2022 factory brochure
Open reference sheet
Published specifications4900
Separate the SF, SB and extended-hood EX layouts before comparing dimensions or powertrain options.
Bumper to back of cab (BBC)123 in3,124 mm
Bumper to front axle (BA)33 in838 mm
2016 factory brochure
Open reference sheet
Published specifications5700XE
Explore the 126 BBC 5700XE with its dated Detroit powertrain and sleeper catalogue.
Bumper to back of cab (BBC)126 in3,200 mm
WheelbaseUp to 250 inUp to 6,350 mm
2016 factory brochure
Open reference sheetA model badge is the beginning.
A tractor’s wheelbase, tare weight, axle ratings and fifth-wheel position depend on its build. Published figures here describe a stated reference configuration. Individual-truck dimensions still need the VIN-linked build record and, where relevant, physical measurement.
Compare semi trucks by model and configuration Measure tractor dimensions Understand tractor-only weightA GROWING KNOWLEDGE BASE
Current families first. More history next.
This collection covers 7 manufacturers and 4 model families. Further editions will add generation-specific sheets, archived brochures, cab and chassis variants, and additional manufacturers as evidence is reviewed.
View the tractor model index