Trek Farley 5

Farley 5 is the ultimate go-anywhere fat bike. Arctic tundra? Farley's game. Sandy desert singletrack? Farley's lofty tires will keep you afloat. A winter bikepacking mission through rugged terrain? Sounds like a walk in the park. Farley's geometry is more capable than ever with a slacker head tube angle for more stability and a steeper seat tube angle for pedaling efficiency and comfortable reach. Up front, its carbon fork is loaded with tons of mounts, so you'll be able to load up gear for the adventure of your dreams.

All the mounts make it easy to add accessories and customize Farley for how you want to roam
It comes with a carbon fork that has lower leg mounts for gear cages, mounts for our custom front rack, and rubber bumpers to protect the dropouts when the front wheel is removed
Its huge 4.5-inch tires will keep you floating over snow, sand, mud, and dirt
The progressive trail geometry feels more capable and confident than ever
The internally routed dropper post lets you move around on the bike and get behind the saddle on steep descents

Fat and fast

27.5″ fat tires give you the best combo of all-terrain grip, stability, flotation, and fast-rolling speed

Adventure-ready fork

Farley's new, short-offset OCLV carbon fork puts you in an optimal position over the front wheel, upping traction over sketchy terrain while allowing for a shorter stem. A custom rack mount on the crown and thoughtfully positioned triple bottle bosses (64mm spacing) on the lower legs let you gear up without sacrificing handling. Protective rubber bumpers on the bottom of the fork legs keep Farley upright and manageable when the front wheel needs to come off.

Haul of the wild

Mounts all over the frame let you carry a wide variety of gear with endless customization options. Gummy bears? Extra layers? Camping gear? Haul it all.

Keep it clean

Internal routing helps to protect Farley's components from the elements and makes it easy to mount gear

Rapid Drive 108 rear hub

With 108 points of engagement, Rapid Drive gives you nearly instant acceleration instead of a clunky lag when you step on the pedals. You get smooth, immediate power to blast out of corners and hammer through the rough stuff. And that extra pedal ratchet adds control that can make all the difference when tackling a tricky climb.

A better way to produce aluminum

Starting in 2024, we began removing high-emission aluminum from our manufacturing and replacing it with low-emission aluminum made with renewable energy. By October 2025, nearly every alloy bike we make - this one included - had made the switch, driving a major drop in our footprint.

Frame	Alpha Platinum Aluminum, tapered head tube, top tube bag mounts, strapless full frame bag mounts, downtube fender mount, lower downtube accessory mount, seat stay rear rack mounts, internal rear derailleur & dropper post routing, 100mm threaded BB, UDH, 197x12mm
Fork	Farley carbon, tapered alloy steerer, crown rack mounts, lower leg cage mounts, 150x15mm thru axle
Tire	Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x4.50''
Hub Front	Bontrager alloy, sealed bearing, 6-bolt, 15x150mm thru axle
Hub Rear	Bontrager alloy, sealed bearing, 6-bolt, Rapid Drive 108, Shimano 10 freehub, 197x12mm thru axle
Rim	SUNRingle Mulefut 80 SL, 32-hole cutout
Skewer Front	Bontrager Switch thru axle
Skewer Rear	Bontrager Switch thru axle, removable lever
Shifter	microSHIFT Advent X SL-M9605, 10 speed
Rear Derailleur	microSHIFT Advent X RD-M6205AM, 48T max cog
Crank	FSA Comet, 30T, 170mm length
Bottom Bracket	FSA BB-7100, 100mm, BSA threaded
Cassette	microSHIFT Advent X, 11-48, 10 speed
Chain	KMC X10, 10 speed
Brake	SRAM Level hydraulic disc
Brake Rotor	Avid G2 CleanSweep, 6-bolt, 160mm
Pedal	VP-536 nylon platform
Saddle	Bontrager Verse P3, steel rails
Seatpost	TranzX JD-YSP18, 100mm travel, internal routing, 31.6mm, 361mm length
Seat Collar	Bolt-on, 36.4mm
Handlebar	Bontrager alloy, 31.8mm, 15mm rise, 750mm width
Stem	Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 50mm length
Headset	FSA IS-2, 1-1/8'' top, 1.5'' bottom
Grips	Bontrager XR Trail Comp, nylon lock-on

Geometry Chart

B B Drop	6.5
B B Height	32
Chainstay Length	45
Eff Seat Tube Angle	74.0°
Eff Top Tube	56.5
Frame Reach	40
Frame Size Letter	S
Frame Stack	58.9
Head Angle	68.5°
Head Tube Length	9
Offset	4.2
Seat Tube	38
Seat Tube Angle	72.5°
Standover	73
Trail	10.7
Wheelbase	109.7
Wheel Size	27.5"

Color

SATIN BLUE SAGE TO LITHIUM GREY FADE