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So Junior wants to get rad just like Mom and Dad? Well, our Fatboy 20 has your kid's name all over it. It has all the same benefits as our 'big kid' Fatboy, only it's built on 20-inch wheels for an ultra-low standover height and kids' size. The family that eats trails together stays together.
- 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
FRAMESET
| FRAME | Fully butted Specialized A1 Premium Aluminum, ZeroStack head tube, 100mm-wide threaded bottom bracket, 170mm rear hub spacing |
| FORK | Specialized A1 Premium Aluminum, 1-1/8" alloy steerer |
| SEAT BINDER | Alloy, 31.8mm |
WHEELS
| RIMS | 20" disc, alloy construction, 68mm internal width, 32h |
| FRONT HUB | Stout 135, loose ball bearings, 10x135 QR, 32h |
| REAR HUB | Stout 170, loose ball bearings, 9-/10-speed cassette body, 10x170mm QR, 32h |
| SPOKES | Stainless, 14g |
| FRONT TIRE | Ground Control Fat, 60 TPI, wire bead, 20x4.0" |
| REAR TIRE | Ground Control Fat, 60 TPI, wire bead, 20x4.0" |
| INNER TUBES | 20x4.0" tube, Presta valve |
DRIVETRAIN
| REAR DERAILLEUR | SRAM X4, long cage, 6-/7-/8-speed |
| SHIFT LEVERS | SRAM, trigger, 9-speed |
| CASSETTE | Sunrace, 9-Speed, 11-36t |
| CHAIN | KMC X9, 9-speed w/ reusable MissingLink™ |
| CRANKSET | 9-speed, 28T chainring w/ chainguard |
| BOTTOM BRACKET | Square taper, 100x151.5mm, sealed bearings |
COCKPIT
| STEM | Alloy, 7-degree rise, 31.8mm clamp |
| HANDLEBARS | Specialized, alloy, 9-degree backsweep, 4-degree upsweep, 680mm width, 31.8mm |
| GRIPS | Specialized Body Geometry XCT, lock-on |
| SADDLE | Specialized Youth, steel rails |
| SEATPOST | Alloy, single-bolt, 27.2mm |
BRAKES
| FRONT BRAKE | Tektro Aries, mechanical disc, organic pads, 160mm rotor |
| REAR BRAKE | Tektro Aries, mechanical disc, organic pads, 160mm rotor |
ACCESSORIES
| PEDALS | Platform |
* Specifications are subject to change without notice
Geometry
Fatboy - Geometry
| 20.0 | |
|---|---|
| Reach | 319mm |
| Top Tube Length, Horizontal | 470mm |
| Stack | 464mm |
| Wheelbase | 914mm |
| Chainstay Length | 390mm |
| Front Center | 526mm |
| BB Drop | 25mm |
| BB Height | 264mm |
| Seat Tube Angle | 72° |
| Head Tube Angle | 69° |
| Seat Tube Length | 280mm |
| Head Tube Length | 120mm |
| Bike Standover Height | 583mm |
| Fork Rake/Offset | 35mm |
| Fork Length, Full | 360mm |
| Trail | 75mm |