Fatboy SE
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Fatboy SE

Part No.  
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Fatboy SE
Technical Specifications

If having fun for the sake of having fun sounds appealing to you, "going fat" will change the way you ride forever. The security and control that the wheel system, found on our Fatboy SE, provides is unparalleled. You get dramatically more traction, grip, and floatation than with traditional mountain tires, all without sacrificing much to climbing efficiency.

The end result is easy to explain—you have way more fun. And to make sure of it, we built the Fatboy with a durable, no-nonsense list of components that are low-maintenance and eager to perform season after season.

  • The frame features an M5 alloy construction that provides the ideal blend of efficiency and durability, while the geometry creates a roomy top tube and short chainstays for easy climbing and confident descending.
  • Our alloy fork with air-formed legs is lightweight and pairs up perfectly with the fat wheel system to soak up trail chatter and bumps.
  • The Shimano 10-speed groupset features a wide gear range that delivers climbing and descending efficiency in spades. On top of this, the one-by setup is notorious for being next to impossible to drop a chain with, plus it provides a significant weight savings in comparison to a standard two-by setup.

Technical Specifications

CHAIN KMC X10, 10-speed w/ reusable Missing Link™
CRANKSET Stout Pro, direct-mount
SHIFT LEVERS Shimano Deore, 10-speed
CASSETTE SunRace, 10-speed, 11-42t
REAR DERAILLEUR Shimano Deore, Shadow Plus, GS cage, 10-speed
FORK Specialized Alloy, 47mm offset, tapered steerer, 150mm axle
SADDLE Body Geometry Henge Sport, 143mm
SEAT BINDER Alloy, bolt-type, 34.9mm
SEATPOST Alloy, 12mm offset, 2-bolt clamp, 30.9mm
HANDLEBARS Stout Riser, double-butted alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 750mm width, 31.8mm
STEM Stout 3D-forged alloy, 31.8mm, 6-degree rise
GRIPS Specialized MTB Grip, lock-on
FRONT HUB Stout Pro 150, sealed cartridge bearings, 6-bolt disc, 15x150mm, 32h
REAR HUB Stout Pro 197, sealed cartridge bearings, 6-bolt disc, 12x197mm, 32h
INNER TUBES Presta, 40mm valve
SPOKES Stainless, 14g
RIMS Stout XC 80, 26", alloy, 76mm internal width, disc-specific
FRONT TIRE Ground Control Fat, 60 TPI, wire bead, 26x4.6"
REAR TIRE Ground Control Fat, 60 TPI, wire bead, 24x4.6"
FRONT BRAKE Tektro Aries, mechanical disc, 203/180mm
REAR BRAKE Tektro Aries, mechanical disc, 180/160mm
PEDALS Specialized Dirt
FRAME Specialized M5 Aluminum, fully butted w/ Smooth Welds, tapered head tube and seat tube, forged post-mount 160mm disc dropouts, internal routing, forged bottom bracket shell, 197x12mm rear thru-axle


Geometry Chart

Fatboy - Geometry

  S M L XL
Bike Standover Height, Actual 765mm 786mm 813mm 847mm
Crank Length 170MM 175MM 175MM 175MM
Stem Length 60MM 60MM 70MM 70MM
Seatpost Length 350MM 350MM 400MM 400MM
Saddle Width 143mm 143mm 143mm 143mm
Handlebar Width 750MM 750MM 750MM 750MM
Reach 395mm 420mm 437mm 458mm
Top Tube Length, Horizontal 579mm 604mm 626mm 651mm
Stack 602mm 602mm 617mm 632mm
Wheelbase 1088mm 1113mm 1135mm 1161mm
Chainstay Length 455mm 455mm 455mm 455mm
Front Center 640mm 665mm 687mm 713mm
BB Drop 60mm 60mm 60mm 60mm
BB Height 316mm 316mm 316mm 316mm
Seat Tube Angle 73mm 73mm 73mm 73mm
Head Tube Angle 71° 71° 71° 71°
Seat Tube Length 394mm 434mm 470mm 520mm
Head Tube Length 94mm 94mm 110mm 125mm
Fork Rake/Offset 47mm 47mm 47mm 47mm
Fork Length, Full 496mm 496mm 496mm 496mm
Trail 83mm 83mm 83mm 83mm