Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Specialized
2018 Specialized Demo 8 I Alloy
Value Guide market data · 2018 Specialized Demo 8 I Alloy
12-month trend
7%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2018 Specialized Demo 8 I Alloy
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Demo model years
2025$6,603 - $7,668▼ 5% vs. 2018
2024$6,603 - $7,668▼ 5% vs. 2018
2023$6,603 - $7,668▼ 5% vs. 2018
2022$6,603 - $7,668▼ 5% vs. 2018
2021$6,510 - $7,560▼ 7% vs. 2018
2020$6,045 - $7,020▼ 13% vs. 2018
2018$6,975 - $8,100Currently viewing
2017$6,975 - $8,1000% vs. 2018
2016$8,370 - $9,720▲ 20% vs. 20182015$8,370 - $9,720▲ 20% vs. 2018
2014$7,905 - $9,180▲ 13% vs. 2018
2013$9,300 - $10,800▲ 33% vs. 2018
2012$6,138 - $7,128▼ 12% vs. 2018
2011$5,952 - $6,912▼ 15% vs. 2018
2010$5,115 - $5,940▼ 27% vs. 2018
2009$5,673 - $6,588▼ 19% vs. 2018
2008$5,859 - $6,804▼ 16% vs. 2018
2006$3,534 - $4,104▼ 49% vs. 2018
2005$4,557 - $5,292▼ 35% vs. 2018
2004$4,836 - $5,616▼ 31% vs. 20182018 Demo 8 I Alloy lineup
Overview
About this bike
2018 Specialized Demo 8 I Alloy value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Frame
- Aluminum / M5 alloy, S3 Geometry, carbon seatstay, BB30, full internal cable routing, 135mm dropouts, lipped and sealed cartridge bearing pivots, replaceable derailleur hanger, 200mm of travelBB Standard:BB30, 83mm, Press Fit
- Suspension
- Full, 200 / 200mm
- Fork
- RockShox BoXXer / RockShox BoXXer Team 27.5, coil spring, S: Extra soft spring, M: Soft spring, L: Medium spring, XL: Firm spring, 200mm of travel, Charger Damper, compression adjust, rebound adjust, alloy steerer, 48mm offset, Maxle Lite DHTravel:200mmSpring Type:Coil
- Shock
- Fox Van Performance / FOX/Specialized Van RC, rebound & compression adjust, 9.5x3.0"Travel:200mmSpring Type:Coil
Drivetrain
- Drivetrain
- 1 × 10
- Groupset
- Truvativ Descendant, GX
- Bottom Bracket
- SRAM BB30, 83mm
- Rear Derailleur
- SRAM GX, Type 2.1, short cage
- Crank
- Custom SRAM Descendant, BB30, 7050 alloy arms w/ Gamut bashguard, 165mm, Steel, 30T
- Shifters
- SRAM X7, trigger
- Cassette
- SRAM PG-1030, 10 speed, 11-36 last three cogs removed
- Chain
- SRAM PC-1031, 10-speed w/ PowerLink
Brakes
- Brakes
- SRAM Guide R Hydraulic Disc / Front: SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm rotor, Rear: SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm rotorType:SRAM Guide R Hydraulic Disc
Cockpit
- Stem
- Specialized Direct Mount DH Stem, two-piece, forged alloy, 45mm
- Handlebar
- Specialized DH, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 800mm, 31.8mm clamp
- Saddle
- Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm
- Seatpost
- Specialized, 6061 alloy, 2-bolt clamp, 0mm setback, 30.9mmType:Rigid
- Grips
- {S=regular thickness, M=regular thickness, L=XL thickness, XL=XL thickness}
Wheels & Tires
- Wheels
- 27.5″ Aluminum
- Rims
- Roval 27.5, alloy, 24mm internal width
- Spokes
- DT Swiss Industry, stainless, 3-cross, 2.0"
- Front Hub
- Specialized disc, alloy flange & disc mount, sealed cartridge bearings, 20mm thru-axle, 32h
- Rear Hub
- Specialized, sealed cartridge bearings, 12x135mm spacing, 32h
- Tires
- Front: Butcher, DH casing, 27.5 b x2.5", 60 TPI, wire bead, Rear: Butcher, DH casing, 27.5 b x2.3", 60 TPI, wire bead
Pedals
- Pedals
- Specialized Bennies, 6061 alloy body, sealed cartridge bearings, 4.5mm removable pins
Frame sizing
WheelsManufacturer sizing
StackManufacturer sizing
ReachManufacturer sizing
Stack/Reach RatioManufacturer sizing
Top Tube LengthManufacturer sizing
Seat Tube LengthManufacturer sizing
Seat Tube AngleManufacturer sizing
Head Tube LengthManufacturer sizing
Head Tube AngleManufacturer sizing
BB DropManufacturer sizing
BB HeightManufacturer sizing
Front CenterManufacturer sizing
Chainstay LengthManufacturer sizing
WheelbaseManufacturer sizing
RakeManufacturer sizing
TrailManufacturer sizing
Standover HeightManufacturer sizing
Stem LengthManufacturer sizing
Crank LengthManufacturer sizing
Handlebar WidthManufacturer sizing
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.
Inspection
Suspension service
Confirm fork lowers and rear shock service intervals; ask for the most recent service receipts.
Inspection
Frame pivots & bearings
Cycle the suspension off the bike to feel for play, grit, or noise in pivot bearings.