Specialized Fatboy

Name: Specialized Fatboy
Brand: Specialized

2017 MountainFat bike Manufacturer page

Suspension: Rigid
Wheels: 26″
Drivetrain: 1 × 10 28t / 11–42t
Gear range: 382%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

14 of 20 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

M5 Aluminum, fully butted w/smooth welding, tapered head tube and seat tube, 100mm of travel, forged post mount 160mm disc drop outs, internal routing, forged bottom bracket shell, 197x12mm thru-axle rear Not identified

Suspension

1 part

Fork
- Specialized

Drivetrain

6 parts

Bottom bracket

BSA, 100mm, threaded Not identified
Cassette
- SunRace 11–42t
Chain
- SRAM PowerLock Chain Connector 10-Speed 10 speeds
Crankset
- Race Face Aeffect 28t
Rear derailleur
- SRAM X7 TYPE 2.1 10 speeds
Shifters
- SRAM X7

Brakes

1 part

Brakes
- Tektro Gemini

Wheels and tires

5 parts

Front hub
- Specialized
Rear hub

Stout XC 197, disc alloy, sealed cartridge bearings, 12x197mm thru-axle, 32h Not identified
Rims
- Specialized
Spokes

Stainless, black, 14g Not identified
Tires

Front: Ground Control Fat, Control casing, 120 TPI, Aramid folding bead, 2Bliss Ready, 26x4.6"", Rear: Ground Control Fat, Control casing, 120 TPI, Aramid folding bead, 2Bliss Ready, 26x4.6"" Not identified

Cockpit and contact points

6 parts

Grips
- Specialized
Handlebar

Stout Pro Riser, double-butted alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 750mm width, 31.8mm Not identified
Pedals
- Specialized
Saddle
- Ritchey Comp
Seatpost
- Specialized
Stem
- Specialized

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 420mm

Stack 600mm

Wheelbase 1111mm

Head angle 70.5°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 26″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	395	420	437	458
Stackmm	590	600	614	628
Top tube lengthmm	576	603	625	650
Seat tube lengthmm	394	445	483	533
Head tube lengthmm	110	120	135	150
Head tube angle	70.5°	70.5°	70.5°	70.5°
Seat tube angle	73°	73°	73°	73°
Chainstay lengthmm	455	455	455	455
Wheelbasemm	1083	1111	1133	1159
Front centermm	634	663	685	711
Bottom bracket dropmm	60	60	60	60
Bottom bracket heightmm	316	316	316	316
Standover heightmm	754	786	812	840
Fork rakemm	46	46	46	46
Trailmm	84	84	84	84
Stack/reach ratio	1.49	1.43	1.41	1.37
Suspension and parts
Crank lengthmm	170	175	175	175
Handlebar widthmm	750	750	750	750
Stem lengthmm	60	60	70	70
Seatpost lengthmm	350	350	400	400

Not published by the manufacturer: Front travel, Rear travel, Stem angle and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 28
Largest chainring: 28
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 42
Lowest gear: 17.3 in
Highest gear: 66.2 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Tire width: 4.6″
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 26″

Technical analysis

2 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

17.3 gear inches

This value is within the central range for this class.

Cohort: Mountain / Fat bike Model year: 2017
Sample: 65 bicycles with this information
Coverage: 95.5% of the class

Highest gear

66.2 gear inches

This value is within the central range for this class.

Cohort: Mountain / Fat bike Model year: 2017
Sample: 65 bicycles with this information
Coverage: 95.5% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.6 km/h
Highest gear: 25.3 km/h

Total gear range 382%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 17.3–66.2 gear inches
Class reference (p10–p90): 15.5–86.7 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Fat bike Model year: 2017
Lowest gear: 65 bicycles with this information, 95.5% of the class
Highest gear: 65 bicycles with this information, 95.5% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2017 builds
Specification	This bicycle Specialized Fatboy	Specialized Fatboy Comp Carbon	Specialized Fatboy SE
Frame
Frame material	Aluminum	Carbon	Aluminum
Fork material	Carbon	Carbon	Aluminum
Drivetrain
Front chainrings	1	Not informed	2
Smallest chainring	28	Not informed	28
Largest chainring	28	Not informed	28
Largest sprocket	42	42	36
Lowest gear	17.3 in	Not informed	20.2 in
Highest gear	66.2 in	Not informed	66.2 in
Brakes
Brake type	Hydraulic disc	Hydraulic disc	Mechanical disc
Other specifications
Bottom bracket standard	BSA	Not informed	BB30
Tire width	4.6″	4″	4.6″

Changes since 2016
Specification	2016 Specialized Fatboy	This bicycle Specialized Fatboy
Drivetrain
Largest sprocket	40	42
Lowest gear	18.2 in	17.3 in
Other specifications
Bottom bracket standard	PF30	BSA
Travel	Configuration: Rigid	Configuration: RigidFront: Additional specification: Not available: YesRear: Additional specification: Not available: Yes