Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Marlin 6
Value Guide market data · 2021 Trek Marlin 6
12-month trend
10%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2021 Trek Marlin 6
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Marlin model years
2026$1,302 - $1,512▲ 17% vs. 2021
2025$1,116 - $1,2960% vs. 2021
2024$1,209 - $1,404▲ 8% vs. 2021
2023$1,209 - $1,404▲ 8% vs. 2021
2022$1,237 - $1,436▲ 11% vs. 2021
2021$1,116 - $1,296Currently viewing
2020$744 - $864▼ 33% vs. 2021
2019$735 - $853▼ 34% vs. 2021
2018$698 - $810▼ 37% vs. 2021
2017$698 - $810▼ 37% vs. 2021
2016$716 - $832▼ 36% vs. 2021
2015$660 - $767▼ 41% vs. 2021
2013$642 - $745▼ 42% vs. 2021
2012$632 - $734▼ 43% vs. 2021
2011$595 - $691▼ 47% vs. 20212021 Marlin 6 lineup
Overview
About this bike
2021 Trek Marlin 6 value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Fork
- SR Suntour XCT 30, coil spring, preload, hydraulic lockout
- Frame
- Alpha Silver Aluminum, internal routing, chainstay disc brake mount, rack and kickstand mount, 135mm QR
Drivetrain
- Groupset
- 2021 Trek Marlin 6
- Crankset
- Shimano M315
- Bottom Bracket
- VP BC73, 73mm, threaded cartridge
- Chain
- KMC Z8.3, 8 speed
- Front Derailleur
- Shimano Altus M315, 34.9mm clamp, top swing, dual pull
- Rear Derailleur
- Shimano Altus M310
- Cassette/Rear Cogs
- Shimano HG31, 11-34T, 8 speed
- Chainrings
- 36/22T
- Shifters
- Shimano Altus M315, 8 speed
Brakes
- Brakes
- Tektro HD-M276 hydraulic disc
Cockpit
- Saddle
- Bontrager Arvada, steel rails, 138mm width
- Headset
- Semi-integrated, 1-1/8-inch
- Stem
- Bontrager alloy, 31.8mm, Blendr compatible, 7 degree
- Handlebars
- Bontrager alloy, 31.8mm, 5mm rise
- Seat Post
- Bontrager alloy, 31.6mm, 12mm offset
- Tape/Grips
- Bontrager XR Endurance Comp, lock-on
Wheels & Tires
- Hubs
- Front: Formula DC-20, alloy, 6-bolt, 100mm QR<br>Rear: Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135mm QR
- Tires
- Bontrager XR2 Comp, wire bead, 30 tpi
- Spokes
- 14g, stainless
- Wheel Size
- 27.5-inch / 29-inch
Pedals
- Pedals
- VP-536 nylon platform
Accessories
- Rims/Wheels
- Bontrager Connection, double-wall, 32-hole, 20mm width, schrader valve
- Color
- Alpine Blue / Radioactive Red/Trek Black
Weight & Sizing
- Size
- X-Small / Small / Medium / Medium/Large / Large / X-Large / XX-Large
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.
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.