Trek FX S 5

5.0 stars
 (3 Reviews)
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Fitness, simplified

FX offers a best-of-both-worlds combination of road bike speed and city bike versatility. It’s the perfect fitness hybrid bike, and so much more.

FX is fast, fun, comfortable, and agile enough for a multitude of uses. From fitness and commuting to errands and mellow Sunday loops, you’ll find your new favorite ride on FX.

- 400 Series OCLV Carbon frame with IsoSpeed decoupler for a smooth ride
- Road bike tech for the premium fitness experience
- Fender mounts and Blendr stem make it easy to accessorize
- DuoTrap S compatible: track your fitness, map your miles

Features & Info

Geometry chart

Trek FX S 5 geometry chart

Consumer Reviews

5.0 stars

(3 reviews)

100% of respondents would recommend this to a friend.


  • Breathability 
  • Packs Well 
  • Smooth Shifting 
  • Lightweight 
  • Warm 
  • Comfortable 


  • Changed Pedals 

Best Uses

  • Comfort 
  • Exercise 
  • City Rides Are Great 
  • Fast For Longer Rides 

Mar 06, 2018

Love this bike

Best Uses:
I waited until I put 1700 miles on the bike before reviewing. I went from a hybrid, Verve 3 to the FX S 5. I loved my Verve so had a difficult time convincing myself to spend the money on another bike. So thankful I did. The FX S 5 is exactly what I was looking for. It's lite & fast enough to keep up, comfortable and just plain fun to ride. The IsoSpeed decoupler and hand grips are amazing technology & provide a surprisingly smooth ride. Perfect for my daily 30+ mile morning rides and other longer rides. Love the hydraulic breaks too. The only cons I can think of are the peddles were small for my big feet and I didn't care for the strap (replaced peddles) and the saddle was extremely rough on the hind quarters. I got some quality cycling shorts and a gel padded seat cover and now ride comfortably. These "cons" are really of a personal nature I wouldn't expect a manufacture to design a bike just for my feet & seat preference (although they came close). I think someone coming from a road bike to a FX wouldn't have a problem with the seat. I can't do a complete review without mentioning the outstanding assistance and continued great service the folks at the Trek store in the Charleston SC West Ashley provide. They were very patient and took quite a bit of time to insure I got the bike I was ready for. I highly recommend this store.
by WRussell from Summerville, SC

Jun 11, 2017


Packs Well, Breathability, Comfortable, Stylish, Lightweight, Warm, Durable
Best Uses:
You pay for what you get this bike is definitely worth the extra bucks of investment period I just got mine three days ago and I absolutely love it
by Rocco from Indiana

Dec 15, 2016

Dang Good Bike

Fast And Easy To Ride, Smooth Shifting, Looks Great Rides Super
Changed Pedals
Best Uses:
Exercise, Fast For Longer Rides, City Rides Are Great
The FX 5 Sport is so smooth. It rides like a dream and is fast for doing longer rides will keep up with others easily. The carbon fiber frame is light in weight and looks so good with the Black Matte Paint. Love the disc brakes, it has a 20 gear setup which I really prefer. I did change out the pedals (didn't like the straps) and also put a Brooks C-17 saddle on board.
by GHow from Hollins, VA


FX Sport 400 series OCLV carbon, IsoSpeed, 3s chain keeper, DuoTrap S compatible, flat mount disc, 12mm thru axle, hidden fender mounts
FX carbon, flat mount disc, hidden fender mounts, 12mm thru axle
1-1/8-inch threadless, sealed cartridge bearings
Bontrager Tubeless Ready Disc
Front: Bontrager, 12mm thru-axle
Rear: Bontrager, 12x142mm thru-axle
Bontrager AW2 Hard-Case Lite, 700x32c, folding
Shimano Tiagra
Bottom Bracket
Press Fit BB86.5
Front Derailleur
Shimano Tiagra, braze-on
Rear Derailleur
Shimano Tiagra
Cassette/Rear Cogs
Shimano Tiagra, 11-34, 10 speed
Shimano Tiagra rapid-fire, 10 speed
Bontrager Satellite Plus IsoZone, 31.8mm, 15mm rise
Bontrager Elite, 31.8mm, 7 degree, w/computer & light mounts
Brake Levers
Tektro HD-R310, hydraulic disc
Tektro HD-R310, hydraulic disc
VP nylon body w/alloy cage, toe-clip/strap
Bontrager Montrose Comp
Seat Post
Bontrager alloy, 2-bolt head, 27.2mm, 8mm offset