49X has its own cab reference
The brochure places 49X alongside the shorter 47X. The 121.5 in figure belongs to 49X; the neighboring model’s shorter figures do not.
Western Star X-Series factory brochure · 2021 · dealer-hosted ↗
THE TRACTOR REFERENCE DESK
Western Star
49X family
Western Star's current vocational platform.
01 / FIND YOUR REFERENCE
Choose a reference edition
Start with the model configuration, then choose a publication and explore its documented equipment.
Catalogue reference
Selecting equipment records your research choice. It does not calculate dimensions, establish an available combination or rate a truck.
About this edition & its evidence
Western Star X-Series factory brochure · 2021 · dealer-hosted. Dated 2021 brochure. Its 121.5 in BBC belongs to the 49X; the adjacent 110.8 and 111.6 in values describe the 47X. Later Power Hood equipment needs its own reference.
Western Star X-Series factory brochure · 2021 · dealer-hosted ↗
DIMENSION GUIDE / A–H
Precision visual reference
Select a measurement to highlight its endpoints and see what the chosen publication confirms.
Western Star 49X · 49X conventional · 2021 factory brochure · 1 published / 7 to verify
Published value Needs verificationSchematic · not to scale
A / SIDE VIEW
Bumper to back of cab (BBC)
Front bumper to the back of the driving cab. Excludes an additional sleeper; it is not overall tractor length.
121.5 in3,086 mm
Published for this reference; confirm the individual build.
Original illustrative views; not to scale, a certified drawing or a selected-build rendering. Endpoints explain the measurements. Published values come from the cited reference, never from the image.
Selected reference: Western Star X-Series factory brochure · 2021 · dealer-hosted. Published values remain tied to this edition.
View the complete dimension table ↓02 / THE MEASUREMENTS
Published dimensions
49X conventional · 2021 factory brochure
| Measurement | Reference value | Scope / how to verify |
|---|---|---|
| Bumper to back of cab (BBC) | 121.5 in3,086 mm | Published in the selected manufacturer reference.Western Star X-Series factory brochure · 2021 · dealer-hosted ↗ |
7 dimensions still to verify · build record / measurement
| Measurement | Reference value | Scope / how to verify |
|---|---|---|
| Wheelbase | Not verified | Build record / measurement required. |
| Overall tractor length | Not verified | Build record / measurement required. |
| Overall height | Not verified | Build record / measurement required. |
| Cab / body exterior width | Not verified | Build record / measurement required. |
| Width across mirrors | Not verified | Build record / measurement required. |
| Fifth-wheel height | Not verified | Build record / measurement required. |
| Bumper to front axle (BA) | Not verified | Build record / measurement required. |
Planning to transport the truck?
Measure fixed exterior width and mirror width separately, plus overall length, the highest accessory, fifth-wheel height and actual transport weight. Interior bunk width is not exterior width.
03 / UNDER THE SKIN
Powertrain & chassis
Detroit / Cummins options · confirm dated engine rating. 2021 X-Series conventional. Read engine, gearbox and axle ratings together.
Numerical powertrain ratings need a dated configuration-specific source. Detroit DD13/DD15/DD16, DT12 vocational and other options depend on exact application.
Documented cab options
- Day cab
- 36 in Low Roof
- 48 in Mid Roof
- 60 in Mid Roof
- 72 in Mid Roof
- 72 in Stratosphere High Roof
Documented transmissions
- Detroit DT12-V
- Detroit DT12-VX
Dated 2021 brochure. Its 121.5 in BBC belongs to the 49X; the adjacent 110.8 and 111.6 in values describe the 47X. Later Power Hood equipment needs its own reference.
04 / MODELS, YEARS & CHANGES
One badge.
Different reference points.
Publication dates and launch milestones do not establish continuous model-year ranges. Match the VIN, production date and equipment era.
Power Hood needs a separate reference
The current product page describes a set-forward Power Hood with larger cooling packaging for DD15 and DD16 applications.
Western Star 49X · product reference reviewed September 2026 ↗Inspection and build evidence
Inspect severe-duty wear, frame/body interfaces, steering, cooling and corrosion.
- factory build
- engine/transmission IDs
- axle/frame ratings
- body-builder record
- PTO/electrical documentation
05 / PUTTING IT TO WORK
Match the trailer to the whole truck.
Axle position, hood, frame, suspension and body integration are primary decisions.
HIGHWAYTRAILERS.CA
Flatbed
Start with deck length, load placement, axle distribution and cab-to-trailer clearance.
Read the guide HIGHWAYTRAILERS.CAStep deck
Compare deck height, gooseneck geometry and the loaded combination’s height.
Read the guide HIGHWAYTRAILERS.CARGN / equipment hauling
Check neck compatibility, fifth-wheel loading, wet-kit requirements and the complete axle layout.
Read the guide HIGHWAYTRAILERS.CAHow trailer capacity works
Review the tractor, coupling, trailer, tyres and load as one combination.
Read the guidePulling a trailer
Confirm build-specific combination, axle, tyre and coupling ratings, kingpin and service connections, clearance and actual axle weights. GVW is the loaded truck; GCW is the loaded combination. Neither is trailer payload.
Moving the tractor as cargo
Give the carrier measured length, exterior and mirror widths, height, ground clearance and transport weight. Assess deck access, breakover, loaded height and securement together.
Deck height & loaded height ↗There is no single “49X towing capacity”.
The model badge, artwork and catalogue option selectors cannot rate an individual combination. Obtain the actual build limits and scale weights.
06 / FOLLOW THE EVIDENCE
Sources & open questions
Reviewed September 7, 2026. Manufacturer figures remain tied to their stated reference; converted equivalents are rounded; original source units are retained. Application and inspection notes are editorial guidance.
Reference-specific evidence needed
- Obtain Power Hood BBC, front overhang and cab-specific chassis drawings.
- Obtain build-specific overall length, exterior and mirror widths, overall height, fifth-wheel height and actual weights.