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Specialized Fatboy

Specialized Fatboy
Satin Oak Green/Spruce/Hyper Green
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The security and control that the Fatboy provides is unparalleled. Those fat tires dramatically boost your traction, grip, and flotation over the trail. We built the Fatboy with a durable list of components, like a SRAM 11-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.
- A FACT carbon fiber fork provides tons of compliance and absorbs chatter, while simultaneously keeping the overall weight of the bike down.
- The Fatboy now rolls on 27.5-inch wheels and 27.5x3.8 Maxxis tires.
- The SRAM SX Eagle one-by drivetrain keeps things simple, yet, with its massive 11x50 gear spread, gives you all the gearing to tackle the biggest climbs and all-day expeditions.
- The frame features an M5 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.

Plus-size rims and tires

Wider than standard yet narrower than fat, plus-size rims and tires hit the sweet spot in grip, stability, and speed, giving you more confidence on technical terrain. Compared to a standard tire you’ll feel grip in places you wouldn’t expect thanks to a bigger contact patch and greater rollover clearance. More air volume allows lower tire pressures which softens bumps and increases float on sand or snow. Whether you’re a novice or an expert, the benefits of plus-size tires and rims will amplify your mountain biking fun.


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
Fork Specialized FACT carbon, 46mm offset, tapered steerer, 150mm axle
Axles Front: 150 x 15mm
Rear: 197 x 12mm
Rims/Wheels Stout XC 80, 27.5", alloy, 76mm internal width, disc-specific
Hubs Front: Stout Pro 150, sealed cartridge bearings, 6-bolt disc, 32h
Rear: Stout Pro 197, sealed cartridge bearings, 6-bolt disc, 32h
Spokes Stainless, 14g
Tires Maxxis Minion FBF, 120 TPI, EXO, 27.5 x 3.8"
Crankset SRAM X1 Alloy
Chainrings 30T
Bottom Bracket SRAM DUB, BSA
Chain SRAM SX Eagle, 12-speed w/ PowerLock
Rear Derailleur SRAM SX Eagle
Cassette/Rear Cogs SRAM PG-1210 Eagle, 11-50t
Shifters SRAM SX Eagle, trigger, 12-speed
Handlebars Stout Riser, double-butted alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 750mm / 780mm width, 31.8mm
Tape/Grips Specialized Sip grip, half-waffle
Stem Specialized, 3D-forged alloy, 4-bolt, 7-degree rise
Brakes SRAM Level T, hydraulic disc
Pedals Specialized Dirt
Saddle Specialized Bridge, size specific, 143/155
Seat Post Specialized 2-bolt head, forged alloy, 8mm offset, micro-adjust, 30.9mm

* Subject to change without notice.

Part Numbers

Option UPC MPN Store SKU
Satin Oak Green/Spruce/Hyper Green / Small 888818545506 99520-7102
Satin Oak Green/Spruce/Hyper Green / Medium 888818544097 99520-7103
Satin Oak Green/Spruce/Hyper Green / Large 888818544523 99520-7104
Satin Oak Green/Spruce/Hyper Green / X-Large 888818544455 99520-7105 210000004951