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 here 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 M4 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 SRAM 11-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/ Missing Link™
CRANKSET Stout direct mount, PF30, 28t
CASSETTE Sunrace, 10-speed, 11-42t
REAR DERAILLEUR SRAM GX, Type 2.1, long cage, 10-speed
FORK Specialized, alloy, air-formed legs, tapered alloy steerer, 135mm hub spacing, open quick-release dropouts
FRONT HUB Stout 135, loose ball bearings, 10x135 QR, 32h
REAR HUB Stout 190, sealed cartridge bearings, 10x190mm QR, 32h
INNER TUBES Standard, Presta valve
SPOKES Stainless, 14g
RIMS Stout XC 80, 26", 76mm internal width, 32h, tubeless ready
FRONT TIRE Ground Control Fat, 60 TPI, wire bead, 26x4.6"
REAR TIRE Ground Control Fat, 60 TPI, wire bead, 24x4.6"
SADDLE Body Geometry Henge Comp, hollow Cr-Mo rails, 143mm
SEATPOST Alloy, 12mm offset, 2-bolt clamp, 30.9mm
STEM Ahead 3D-forged alloy, 31.8mm clamp, 6-degree rise
HANDLEBARS Double-butted alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 750mm width, 31.8mm
GRIPS Specialized MTB Grip, lock-on
FRONT BRAKE Tektro Aries, mechanical disc, organic pad, 203/180mm rotor
REAR BRAKE Tektro Aries, mechanical disc, organic pad, 180/160mm rotor
PEDALS Specialized Platform, Cr-Mo, 9/16" spindle
SEAT BINDER Alloy, 31.8mm
FRAME Specialized M4 Aluminum, fully butted tubing w/Smooth Welds, tapered head tube, post mount disc dropouts, 190mm rear hub spacing, replaceable alloy derailleur hanger


Geometry Chart

Fatboy - Geometry

  S M L XL
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 576mm 603mm 625mm 650mm
Stack 590mm 600mm 614mm 628mm
Wheelbase 1083mm 1111mm 1133mm 1159mm
Chainstay Length 455mm 455mm 455mm 455mm
Front Center 634mm 663mm 685mm 711mm
BB Drop 60mm 60mm 60mm 60mm
BB Height 316mm 316mm 316mm 316mm
Seat Tube Angle 73° 73° 73° 73°
Head Tube Angle 70.5° 70.5° 70.5° 70.5°
Seat Tube Length 394mm 445mm 483mm 533mm
Head Tube Length 110mm 120mm 135mm 150mm
Bike Standover Height 754mm 786mm 812mm 840mm
Fork Rake/Offset 46mm 46mm 46mm 46mm
Fork Length, Full 467mm 467mm 467mm 467mm
Trail 84mm 84mm 84mm 84mm