Southern Trailer Works Showroom
2026 Big Dog Mastiff
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Description
2026 Big Dog Mastiff
Built to impress with premium parts, but without the premium price. You won’t sacrifice performance with the limited-production Mastiff.
Embrace Superiority
Production-grade reliability, hand-craftsmanship, and precision engineering create a truly incredible on-road experience. The Mastiff delivers the refined power and comfort riders expect from Big Dog Motorcycles.
A Provocative Ride
With its long and lean, minimalistic styling, the Mastiff has the highest power-to-weight ratio in the Big Dog lineup. Feel the adrenaline when nimble handling meets unchained power.
Make It Personal
Customize your Mastiff to fit your unique riding style. Choose from a large selection of graphics and striking accessories to enhance your journey.
Info
Industry
Powersports
Make
Big Dog
Model
Mastiff
Trim
Base
Year
2026
MSRP
39995
Category
Motorcycle
Subcategory
Cruiser
Specs
Engine Type
S&S SuperSidewinder, Overhead Valve, 45-Degree, V-Twin
Engine Disp to Wgt
124 cu in (2,032 cu cm)
Bore x Stroke
4-1/8 x 4-5/7 in
Ignition/Starter
S&S VFI (Fuel Injected) | S&S Superstock (Carbureted)
Transmission
6-Speed, Right-Side-Drive
Drive Train
Primary Drive Chain: Chain | Final Drive: Belt
Front Caliper
Performance Machine, 4-piston, Differential Bore
Rear Caliper
Performance Machine, 4-Piston, Standard Bore
Rear Tire
300/35VR18
Front Tire
120/70-21, 120/60R-23
Electrical System
Charging System: 32 Amp
Battery
Sealed AGM, 310 CCA
GVWR
1130 lbs
Oil Capacity
3 qt
Oil Type
20W-50
Frame
Rake: 39° | Tubing: Heavy Duty, 1-1/2 in O.D. | Backbone Stretch (Over Stock): 6 in | Downtubes Stretch (Over Stock): 0 in
Suspension (Front)
Telescopic, 41mm
Seat Height
24.25 in
Ground Clearance
4.5 in
Wheelbase
77.5 in
Length
Overall: 106 in
