Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek FX Sport Carbon 4
Previous used estimate
$648 - $667
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Trek FX Sport Carbon 4
12-month projected trend
12%
Direction and magnitude, not judgment
vs. category average
4%
Drops faster than category avg
Price over time - 2021 Trek FX Sport Carbon 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All FX model years
Overview
About this bike
FX Sport 4 is a carbon fiber fitness bike for riders who want the speed of a lightweight road bike with the comfort and control of a flat handlebar. An IsoSpeed decoupler smooths out rough roads and the 1x11 drivetrain simplifies shifting without sacrificing gear range, making this high-performance bike perfect for everything from solo workouts to speedy group rides. It's right for you if... You're ready to log big miles, and you prefer the feel of a flat handlebar to the drop bars that come stock on most road bikes. You prioritize comfort and performance equally, and want the simplicity a 1x drivetrain provides. The tech you get A lightweight OCLV Carbon frame with a road-smoothing IsoSpeed decoupler, a Shimano GRX 1x11 drivetrain with a wide-range cassette, Shimano hydraulic disc brakes for all-weather stopping power, a lightweight tubeless ready wheelset, and ergonomic grips. Plus, it's easy to accessorize with fenders, lights, and more! The final word Fast, capable, comfortable. This bike has a road-smoothing carbon frame and quality parts that will hold up over serious miles, but what really sets this model apart is the simpler shifting experience the 1x11 drivetrain provides. Why you'll love it - The 1x drivetrain delivers a wide range of gearing with the simplicity of a single shifter - You get the superior ride quality of carbon without the bank-breaking price - IsoSpeed—a decoupler at the seat tube/top tube junction that absorbs fatiguing bumps from the road so you can stay stronger longer - On your left, roadie! This fitness bike is more than capable of taking on speedy group road rides - You can pair FX Sport with your smartphone and send your ride data to your favorite fitness app when you add DuoTrap S
Specifications
- Subtype
- Fitness & Hybrid
- Category
- Hybrid
- Component Fork
- FX Carbon, threadless alloy steerer, hidden fender mounts, flat mount disc, 405mm axle-to-crown, 100x12mm thru axle
- Component Hubs
- Front: Formula alloy, Center Lock disc Rear: Shimano RXC400, Center Lock, Shimano 11-speed freehub
- Component Size
- X-Small, Small, Medium, Large, X-Large
- Component Stem
- Bontrager Elite, 31.8mm, Blendr compatible
- Product Family
- FX
- Component Axles
- Front: 100 x 12mm thru axle Rear: 142 x 12mm thru axle
- Component Chain
- Shimano HG601
- Component Color
- Dark Aquatic/Carbon Smoke, Quicksilver/Carbon Smoke
- Component Frame
- 400 series OCLV carbon, IsoSpeed, internal routing, 3s chain keeper, DuoTrap S compatible, fender mounts, flat mount disc, 142x12mm thru axle
- Component Tires
- Bontrager R1 Hard-Case Lite, wire bead, 60 tpi, 700x32c
- Component Brakes
- Shimano MT201 hydraulic disc, flat mount, 160mm rotors
- Component Pedals
- Wellgo M141, resin body, alloy cage
- Component Saddle
- Bontrager H1
- Component Headset
- 1-1/8" threadless, sealed cartridge bearings
- Component Crankset
- Shimano GRX RX600
- Component Shifters
- Shimano RS700, 11 speed
- Component Seat Post
- Bontrager alloy, 27.2mm, 12mm offset, 330mm length
- Component Chainrings
- 40T
- Component Handlebars
- Bontrager Satellite Plus IsoZone
- Component Tape Grips
- Bontrager Satellite IsoZone Plus, lock-on, ergonomic
- Component Brake Levers
- Shimano MT201 hydraulic disc
- Component Bottom Bracket
- Shimano BB71, 86.5mm, PressFit
- Component Rear Derailleur
- Shimano GRX RX812, long cage, 42T max cog
- Component Cassette Rear Cogs
- Shimano SLX M7000, 11-42T, 11 speed
- Hubs
- Front: Formula alloy, Center Lock disc Rear: Shimano RXC400, Center Lock, Shimano 11-speed freehub
- Tires
- Bontrager R1 Hard-Case Lite, wire bead, 60 tpi, 700x32c
- Crankset
- Shimano GRX RX600
- Pedals
- Wellgo M141, resin body, alloy cage
- Bottom Bracket
- Shimano BB71, 86.5mm, PressFit
- Chain
- Shimano HG601
- Saddle
- Bontrager H1
- Headset
- 1-1/8" threadless, sealed cartridge bearings
- Rear Derailleur
- Shimano GRX RX812, long cage, 42T max cog
- Stem
- Bontrager Elite, 31.8mm, Blendr compatible
- Axles
- Front: 100 x 12mm thru axle Rear: 142 x 12mm thru axle
- Brake Levers
- Shimano MT201 hydraulic disc
- Brakes
- Shimano MT201 hydraulic disc, flat mount, 160mm rotors
- Chainrings
- 40T
- Fork
- FX Carbon, threadless alloy steerer, hidden fender mounts, flat mount disc, 405mm axle-to-crown, 100x12mm thru axle
- Frame
- 400 series OCLV carbon, IsoSpeed, internal routing, 3s chain keeper, DuoTrap S compatible, fender mounts, flat mount disc, 142x12mm thru axle
- Handlebars
- Bontrager Satellite Plus IsoZone
- Seat Post
- Bontrager alloy, 27.2mm, 12mm offset, 330mm length
- Shifters
- Shimano RS700, 11 speed
- Tape/Grips
- Bontrager Satellite IsoZone Plus, lock-on, ergonomic
- Color
- Quicksilver/Carbon Smoke
- Size
- X-Large
- Cassette/Rear Cogs
- Shimano SLX M7000, 11-42T, 11 speed
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.