Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Specialized
2018 Specialized Fatboy 20
Value Guide market data · 2018 Specialized Fatboy 20
12-month trend
8%
Direction and magnitude, not judgment
vs. category average
5%
Drops faster than category avg
Price over time - 2018 Specialized Fatboy 20
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Fatboy model years
2018 Fatboy 20 lineup
Overview
About this bike
2018 Specialized Fatboy 20 value depends on condition, original build, frame material, service history, and current buyer demand.
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
Drivetrain
- Groupset
- 2018 Specialized Fatboy 20
- 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
Brakes
- REAR BRAKE
- Tektro Aries, mechanical disc, organic pads, 160mm rotor
- FRONT BRAKE
- Tektro Aries, mechanical disc, organic pads, 160mm rotor
Cockpit
- SEAT BINDER
- Alloy, 31.8mm
- 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
Wheels & Tires
- 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
Pedals
- PEDALS
- Platform
Frame sizing
XS4'10"-5'2"
S5'2"-5'6"
M5'6"-5'10"
L5'10"-6'2"
XL6'2"-6'6"
M highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- Varies by size
- Reach
- Varies by size
- Wheelbase
- Varies by size
Industry standard. Sourced from catalog metadata.
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Wheel condition
Inspect rims, hubs, spokes, and bearing play; ask about the tire age and any prior wheel rebuilds.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.