Fatboy Frameset
Part No.  

Fatboy Frameset

Part No.  
Fatboy Frameset
Technical Specifications
All the fun of a fat bike with the performance of a Specialized. The Fatboy frameset is a lightweight yet agile M4 Premium Aluminum frame coupled with the new Specialized FACT carbon fork with plenty of clearance for fat tires. Ready to build up to your spec.
  • Specialized FACT carbon fork w/ 5-inch tire clearance for stiff handling
  • Fully butted M4 Premium Aluminum frame w/ up to 5-inch tire clearance is lightweight and stiff

Technical Specifications

FORK Specialized FACT carbon, full monocoque, tapered steerer, 135mm hub spacing
BOTTOM BRACKET e.thirteen, PF30, included w/ crankset
CRANKSET Custom e.thirteen, TRS+, PF30, 100mm spindle, w/ BB
CHAINRINGS Praxis, 36/22, alloy
HEADSET 1-1/8"" upper, 1-1/2"" lower, Campy style, integrated sealed cartridge bearings, split crown race, 3.8mm cone spacer
SEAT BINDER Alloy, 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