Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek FX 4 Disc
Value Guide market data · 2021 Trek FX 4 Disc
12-month trend
9%
Direction and magnitude, not judgment
vs. category average
6%
Drops faster than category avg
Price over time - 2021 Trek FX 4 Disc
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All FX model years
2026$2,139 - $2,484▲ 5% vs. 2021
2025$2,790 - $3,240▲ 36% vs. 2021
2024$2,604 - $3,024▲ 27% vs. 2021
2023$2,604 - $3,024▲ 27% vs. 2021
2022$2,604 - $3,024▲ 27% vs. 2021
2021$2,046 - $2,376Currently viewing
2020$2,046 - $2,3760% vs. 2021
2019$1,953 - $2,268▼ 5% vs. 2021
2018$1,860 - $2,160▼ 9% vs. 2021
2017$1,953 - $2,268▼ 5% vs. 2021
2013$409 - $475▼ 80% vs. 2021
2012$2,372 - $2,754▲ 16% vs. 2021
2011$2,492 - $2,894▲ 22% vs. 2021
2010$2,492 - $2,894▲ 22% vs. 20212021 FX 4 Disc lineup
Overview
About this bike
2021 Trek FX 4 Disc value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Frame
- Alpha Gold Aluminum, DuoTrap S compatible, internal cable routing, flat mount disc, rack & fender mounts, 135 x 5mm QR
- Fork
- FX Carbon, rack and fender mounts, flat mount disc, 405mm axle-to-crown, ThruSkew 5mm QR
Drivetrain
- Groupset
- 2021 Trek FX 4 Disc
- Crankset
- ProWheel alloy, 175mm
- Chainrings
- 42T
- Rear Derailleur
- Shimano Deore M5100, long cage, Shadow Plus
- Cassette/Rear Cogs
- Shimano Deore M5100, 11-51, 11 speed
- Shifters
- Shimano Deore M5100, 11 speed
Brakes
- Brakes
- Shimano MT201 hydraulic disc, flat mount, 160mm rotor
Cockpit
- Headset
- 1-1/8" threadless, sealed cartridge bearings
- Handlebars
- Bontrager Satellite Plus IsoZone, alloy, 31.8mm, 15mm rise
- Tape/Grips
- Bontrager Satellite IsoZone Plus, lock-on, ergonomic
- Stem
- Bontrager Elite, 31.8mm, Blendr compatible, 7 degree
- Saddle
- Bontrager H1
- Seat Post
- Bontrager alloy, 27.2mm, 12mm offset, 330mm length
Wheels & Tires
- Axles
- Front: 100 x 5mm QR<br>Rear: 135 x 5mm QR
- Hubs
- Front: Formula DC-20, alloy, 6-bolt<br>Rear: Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub
- Tires
- Bontrager H2 Comp, wire bead, 30tpi, 700x32c
Pedals
- Pedals
- Bontrager Satellite City pedal
Accessories
- Color
- Dnister Black to Radioactive Red Fade
Weight & Sizing
- Size
- Small / Medium / Large / X-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.