Fatboy Pro
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Fatboy Pro

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Fatboy Pro
Technical Specifications
All the fun of a fat bike with the performance of a Specialized. The Fatboy Pro combines a lightweight frame, RockShox Bluto fork, and 4.6" Ground Control tires to create a geometry similar to Specialized 29er geometry for nimble handling in the most extreme conditions.
  • Fat 26" disc, alloy single wall rims are designed to handle even the worst terrain
  • Specialized Ground Control Fat 26x4.6" tires roll over anything
  • Race Face Next SL crankset w/ 100mm spindle is built for power no matter the terrain
  • Shimano XT, hydraulic disc brakes w/ Ice Tech pads and rotors for max stopping power
  • SRAM X0, 11-speed derailleur w/ carbon cage for reliable and precise shifting
  • Fully butted M4 Premium Aluminum frame w/ up to 5-inch tire clearance is lightweight and stiff
  • RockShox Bluto RL Solo Air spring shock w/ TurnKey damping for traction in all conditions

Technical Specifications

CHAIN KMC X11L, 11-speed, reusable Missing Link
CRANKSET Race Face Next SL, PF30 BB, 100mm spindle, 30T, spiderless
SHIFT LEVERS SRAM X01,11-speed, trigger
CASSETTE SRAM X1, 11-speed, 11-42
REAR DERAILLEUR SRAM X01, 11-speed, carbon cage
FORK RockShox Bluto RL, Solo Air spring, TurnKey damping, tapered alloy steerer, external rebound adj., 32mm alloy stanchions w/ mag lowers, disc mount, QR 15mm thru-axle for 150mm hub spacing
FRONT HUB Specialized Hi Lo disc, sealed cartridge bearings, 15mm thru-axle, 150mm wide, 32h
REAR HUB Specialized Hi Lo disc, alloy, sealed cartridge bearings, XD driver body, 190mm wide, QR, 32h
INNER TUBES Standard, presta valve
SPOKES Stainless, 2.0/1.8/2.0mm
RIMS Specialized Fatboy SL, alloy disc, single wall, 90mm wide, sleeve joint, hookless design, 32h
FRONT TIRE Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6""
REAR TIRE Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6""
SADDLE Body Geometry mountain, hollow Cr-Mo rails, 143mm
SEATPOST Command Post BlackLite, alien head design, single bolt head, w/ remote adjust lever, 30.9mm, S: 100mm travel, M/L/XL: 125mm
STEM Specialized, 3D forged alloy, 4-bolt, 6-degree rise, anti-corrosion hardware
HANDLEBARS Specialized, mini rise, 7050 alloy, 8-backsweep, 6-upsweep, 10mm rise, 31.8mm
GRIPS Specialized Body Geometry XC Contour, Kraton w/ gel, lock-on, closed end
FRONT BRAKE Shimano XT, hydraulic disc, Ice Tech resin pads w/ fins, Ice Tech rotor
BRAKE LEVERS Shimano XT, hydraulic, w/ reach adjust
REAR BRAKE Shimano XT, hydraulic disc, Ice Tech resin pads w/ fins, Ice Tech rotor
PEDALS Specialized Bennies, 6061 alloy body, sealed cartridge, 4.5mm removable pins
HEADSET 1-1/8"" upper, 1-1/2"" lower, integrated Campy style, sealed cartridge bearings, split crown race, 3.8mm cone spacer
SEAT BINDER Command Post, single bolt, 34.9mm
FRAME Specialized M4 Premium Aluminum, fully butted w/ smooth welds, tapered headtube, 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
Handle-Bar Width 750mm 750mm 750mm 750mm
Seat Tube Angle (Effective) 73° 73° 73° 73°
Reach 395mm 420mm 437mm 458mm
Stack 590mm 600mm 615mm 629mm
Bottom Bracket Drop 60mm 60mm 60mm 60mm
Chainstay Length 455mm 455mm 455mm 455mm
Head Tube Angle 70.5° 70.5° 70.5° 70.5°
Head Tube Length 110mm 120mm 135mm 150mm
Top Tube Length (Horizontal) 576mm 603mm 625mm 650mm
Seat Tube Length, Center to Top 394mm 445mm 483mm 533mm
Standover Height 757mm 793mm 820mm 849mm
Wheel Base 1083mm 1105mm 1128mm 1154mm
Seat Tube Angle (Actual) 73° 73° 73° 73°
Bottom Bracket Height 315mm 315mm 315mm 315mm
Seat-Post Length 350mm 350mm 400mm 400mm