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All the fun of a fat bike with the performance of a Specialized for youngsters. The Fatboy 20 combines a lightweight frame and fork with 4.0" Ground Control tires to tackle any terrain in all conditions.
- The frame features an A1 Premium Aluminum 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.
- Our A1 Premium Aluminum fork is lightweight and pairs up perfectly with the fat wheel system to soak up trail chatter and bumps.
- The SRAM X4 9-speed rear derailleur provides plenty of gears for your little ones to make it up and down almost anything, while being tough enough for abuse.
Manual Downloads
Technical Specifications
DRIVETRAIN
| BOTTOM BRACKET | Square taper, sealed cartridge bearings, 100mm shell, 164mm axle |
| CHAIN | KMC X9, 9-speed w/ reusable MissingLink™ |
| CRANKSET | Forged alloy, 32T, w/ chainguard |
| SHIFT LEVERS | SRAM X4, 9-speed, trigger |
| CASSETTE | Sunrace, 9-speed, 11-36t |
| CHAINRINGS | Alloy, 28T |
| REAR DERAILLEUR | SRAM X4, long cage |
SUSPENSION
| FORK | Specialized A1 Premium Aluminum, 1-1/8" alloy steerer |
COCKPIT
| HEADSET | 1-1/8", threadless, ZeroStack, semi-cartridge bearings |
| SADDLE | Specialized Youth, steel rails |
| SEAT BINDER | Alloy, single bolt, 31.8mm |
| SEATPOST | Alloy, single bolt, 27.2mm |
| HANDLEBARS | Specialized, double-butted 6061 alloy, 9-degree backsweep, 4-degree upsweep, 31.8mm, 720mm width |
| STEM | Specialized, 3D-forged alloy, 4-bolt, 6-degree rise, 31.8mm clamp |
| GRIPS | Specialized Body Geometry Women's XCT, lock-on |
WHEELS & TIRES
| FRONT HUB | Stout 135, loose ball bearings, 10x135 QR, 32h |
| REAR HUB | Specialized 170, Hi Hi disc, alloy, double-sealed loose ball bearings, QR, 32h |
| INNER TUBES | 20x4.0" tube, Presta valve |
| SPOKES | Stainless, 14g |
| RIMS | 24" disc, alloy construction, 68mm internal width, 32h |
| FRONT TIRE | Ground Control Fat, 60 TPI, wire bead, 20x4.0" |
| REAR TIRE | Ground Control Fat, 60 TPI, wire bead, 20x4.0" |
BRAKES
| FRONT BRAKE | Tektro Aries, mechanical disc, organic pads, 160mm rotor |
| BRAKE LEVERS | Tektro, Jr V-brake |
| REAR BRAKE | Tektro Aries, mechanical disc, organic pads, 160mm rotor |
ACCESSORIES
| PEDALS | Platform |
FRAMESET
| FRAME | Specialized A1 Premium Aluminum, fully-butted w/ smooth welds, ZeroStack head tube, 170mm rear hub spacing, replaceable alloy derailleur hanger |
* Specifications are subject to change without notice
Geometry
Fatboy - Geometry
| 11 | |
|---|---|
| Crank Length | 127.0 |
| Stem Length | 60.0 |
| Seatpost Length | 300.0 |
| Handlebar Width | 640.0 |