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2015 Fatboy SL

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The smartest fat bike build you can buy. By combining our lightweight M4 alloy Fatboy…

Product Details

The smartest fat bike build you can buy. By combining our lightweight M4 alloy Fatboy frame with carbon where it really counts, we've delivered a bike that shaves considerable weight off the competition at a price that makes this accessible.

Fully butted M4 Premium Aluminum frame is lightweight and stiff
Specialized FACT carbon fork w/ 5-inch tire clearance for stiff handling
Specialized Ground Control 4.6-inch tires roll over anything
Race Face Next SL carbon crankset with SRAM XX1 1x11 components provides an incredibly light and efficient drivetrain
HED Big Deal Carbon rims for super light and stiff wheels that are tubeless compatible

Technical Specifications

FRAMESET

FRAME

Specialized M4 Premium Aluminum, fully butted w/ smooth welds, tapered headtube, post-mount disc dropouts, 190mm rear hub spacing, replaceable alloy derailleur hanger

HEADSET

1-1/8"" upper, 1-1/2"" lower, Campy style, integrated sealed cartridge bearings

SEAT BINDER

Alloy, 31.6mm

SUSPENSION

FORK

Specialized FACT carbon, full monocoque, tapered steerer, 135mm hub spacing, open QR dropouts

WHEELS

RIMS

HED Big Deal, carbon, single wall, tubeless, 85mm wide, 32h

FRONT HUB

Specialized Stout XC 135, Hi Lo disc, alloy, sealed cartridge bearings, QR, 32h

REAR HUB

Specialized Stout XC 190, Hi Lo disc, alloy, sealed cartridge bearings, QR, 32h

SPOKES

Stainless, butted, 2.0/1.8/2.0mm, black

FRONT TIRE

Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6""

REAR TIRE

Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6""

INNER TUBES

Standard, presta valve

DRIVETRAIN

REAR DERAILLEUR

SRAM XX1, 11-speed, carbon cage

SHIFT LEVERS

SRAM XX1, 11-speed, trigger

CASSETTE

SRAM XX1, 11-speed, 10-42

CHAIN

KMC X11L, 11-speed, w/ reusable MissingLink

CRANKSET

Race Face Next SL, PF30 BB, 100mm spindle, 30T, spiderless

COCKPIT

STEM

Specialized Stout XC, 3D forged alloy, 4-bolt, 6-degree rise, anti-corriosion hardware

HANDLEBARS

Specialized flat, carbon, 8-degree backsweep, 31.8mm

GRIPS

Specialized Sip Grip, light lock-on, half-waffle, S/M: regular thickness, Others: XL

SADDLE

Body Geometry Phenom Expert, hollow Ti rails, 143mm

SEATPOST

S-Works FACT carbon, 20mm offset, 27.2mm

BRAKES

FRONT BRAKE

Magura MT8, hydraulic disc, Hi Friction pad, carbon master cylinder, alloy caliper, Storm SL rotor

REAR BRAKE

Magura MT8, hydraulic disc, Hi Friction pad, carbon master cylinder, alloy caliper, Storm SL rotor

BRAKE LEVERS

Magura MT8, carbon lever

ACCESSORIES

PEDALS

Alloy, 1 pc. body, 9/16"", w/ reflectors

* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.

Geometry

	S	M	L	XL
Top Tube Length (Horizontal)	576mm	603mm	625mm	650mm
Seat-Post Length	350mm	350mm	400mm	400mm
Seat Tube Angle (Effective)	73°	73°	73°	73°
Seat Tube Angle (Actual)	73°	73°	73°	73°
Handle-Bar Width	750mm	750mm	750mm	750mm
Seat Tube Length, Center to Top	394mm	445mm	483mm	533mm
Bottom Bracket Drop	60mm	60mm	60mm	60mm
Bottom Bracket Height	315mm	315mm	315mm	315mm
Wheel Base	1083mm	1105mm	1128mm	1154mm
Standover Height	757mm	793mm	820mm	849mm
Stack	590mm	600mm	615mm	629mm
Reach	395mm	420mm	437mm	458mm
Head Tube Length	110mm	120mm	135mm	150mm
Head Tube Angle	70.5°	70.5°	70.5°	70.5°
Chainstay Length	455mm	455mm	455mm	455mm
Crank Length	170mm	175mm	175mm	175mm
Stem Length	60mm	60mm	70mm	70mm