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Fatboy

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2020 Fatboy

The security and control that the Fatboy provides is unparalleled. Those fat, 27.5x3.8 tires dramatically boost your traction, grip, and floatation over the trail. We built the Fatboy with a durable list of components, like a SRAM 12-speed one-by drivetrain, that perform season after season.

A VERY FAT FLAVOR OF ADVENTURE

It boils down to a single word: adventure. The Fatboy's massive tires (27.5x3.8") float over rocks, roots, sand, snow, ice.... Let's put it this way, if it's part of mother earth, those big tires will roll right over it with a mix of comfort and traction that's unrivaled. Get out there.

• Premium, M5 alloy frame is light on the scales, yet holds up to any adventure.

• Lightweight carbon-fiber fork provides tons of compliance and absorbs chatter.

• The SRAM SX Eagle 1X drivetrain is simple, yet gives you plenty of gearing to tackle any climb.

Technical Specifications

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Frameset

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

SEAT BINDER

Alloy, bolt-type, 34.9mm

Suspension

FORK

Specialized FACT carbon, 46mm offset, tapered steerer, 150mm axle

Cockpit

SADDLE

Specialized Bridge, size specific, 143/155

SEATPOST

Specialized 2-bolt head, forged alloy, 8mm offset, micro-adjust, 30.9mm

STEM

Specialized, 3D-forged alloy, 4-bolt, 7-degree rise

HANDLEBARS

Stout Riser, double-butted alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 750mm / 780mm width, 31.8mm

GRIPS

Specialized Sip grip, half-waffle, S/M: regular thickness, L/XL: XL thickness

Brakes

FRONT BRAKE

SRAM Level T, hydraulic disc, 200/180mm

REAR BRAKE

SRAM Level T, hydraulic disc, 180/160mm

Drivetrain

REAR DERAILLEUR

SRAM SX Eagle, 12-speed

SHIFT LEVERS

SRAM SX Eagle, trigger, 12-speed

CHAIN

SRAM SX Eagle, 12-speed w/ PowerLock®

CRANKSET

SRAM X01 Eagle, DUB, 30T

CHAINRINGS

Steel, 30T

Wheels

RIMS

Stout XC 80, 27.5", alloy, 76mm internal width, disc-specific, tubeless ready

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

FRONT TIRE

Maxxis Minion FBF, 120 TPI, EXO, 27.5 x 3.8"

REAR TIRE

Maxxis Minion FBR, 120 TPI, EXO, 27.5 x 3.8"

INNER TUBES

Presta valve

Wheels & Tires

SPOKES

Stainless, 14g

Accessories

PEDALS

* 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

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SMLXL
Crank Length170mm175mm175mm175mm
Handlebar Width750mm750mm750mm750mm
Stem Length60mm60mm70mm70mm
Saddle Width155mm143mm143mm143mm
Seatpost Length350mm350mm400mm400mm
Stack602mm602mm617mm632mm
Reach395mm420mm437mm458mm
Head Tube Length94mm94mm110mm125mm
Head Tube Angle71°71°71°71°
BB Height312mm312mm312mm312mm
BB Drop60mm60mm60mm60mm
Trail83mm83mm83mm83mm
Fork Length, Full496mm496mm496mm496mm
Fork Rake/Offset47mm47mm47mm47mm
Front Center640mm665mm687mm713mm
Chainstay Length455mm455mm455mm455mm
Wheelbase1088mm1113mm1135mm1161mm
Top Tube Length, Horizontal579mm604mm626mm651mm
Bike Standover Height, Actual765mm786mm813mm847mm
Seat Tube Length394mm434mm470mm520mm
Seat Tube Angle73mm73mm73mm73mm
Geometry

Rider Reviews

  • 4
  • 6 Reviews
 

Rocky Mountain Snow Cruiser!

Bought this in January 2020, added a dropper and Maxxis Colossus 4.5 tires. By far the easiest tubeless conversion I've ever done, just remove the tube! The Stout rims utilize a neoprene nipple washer so rim tape is not needed!!! The SX derailleur is the bikes Achilles heel. The spring is weak and sometimes it's impossible to shift to the smallest cog, especially at low temperatures.


Name:
Tony A.

Helpful?

3 flats in first 400 miles

I bought this and had to fix the back tire 2 times and the front tire once. 95% of my mileage has been on the road. This amount of flats are unacceptable. I like the bike otherwise.


Name:
Ryan D.

Helpful?

Big fun in the snow

Bought it for winter riding, never got off it. Big wheels keep on turnin'. .Hope to add a dropper seatpost soon.


Name:
Sven B.

Helpful?

Brakes are junk!

The first time that I ride this bike is down a steep and rocky canyon. I am surprised at how the brakes fail to stop me. I only weigh 170 pounds also. Don't expect much from the entry level SX drivetrain either. I am told that the rims are not tubeless ready, so I have pay for another yet upgrade.


Name:
Tomt

Helpful?

Front rotor noise was almost a deal breaker.

This bike is as advertised. I like the ride, like the versatility it provides. However, when I bought the bike, the front rotor was vibrating and made a very loud and high pitched noise that increased with an increase in speed. On day 2, I took the bike back to WheelSport in Spokane and they tried several times (they had the bike for a week) to adjust this with no luck. They took the entire front assembley apart several times and re-installed, trying to fix the problem. The guys at WS agreed that this noise was not acceptable and finally just replaced the front rotor (at their cost) with a new $150 rotor. Had they not been able to do this, I would have returned the bike. I have no idea if this is a common issue or just a fluke but it was obvious and annoying from the start. Hopefully it was only an issue on my bike. I have always ridden Specialized but that is in large part because of the guys at Wheelsport, not necessarily just the bikes.


Name:
Compasssteve

Helpful?

great performance great value

I've used this bike for everything from rock gardens to river crossings to snow. it handles great ( for a fat bike). the weight of the bike is very good considering that its an aluminum frame. I was expecting a bike that would awful to push up the hills, but this bike climbs just as well as my trail bike! I was also a little skeptical about the new sram sx eagle but it performs great, only a minuscule difference in performance from the well renowned gx eagle. If you are looking to get into fat biking this is the bike for you.


Name:
Cohen T.

Helpful?