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The Farley 5 is the ultimate go-anywhere fat bike.
The Farley 5 is the ultimate go-anywhere fat bike.
Trek

Trek Farley 5 Fat Bike 2026 in Blue Sage to Lithium Grey Fade

£1,700.00
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Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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In the unlikely event that you are not satisfied with your purchase please feel free to return your items within 90 days of the purchase date for a full exchange or refund. Any item (excluding food, underwear or e-gift vouchers) can be returned to us for any reason within 90 days, provided that the item has not been used or fitted and is returned in its original packaging with valid proof of purchase.

It is recommended that you use a recorded delivery service or return to a store to ensure your items are received by us. We cannot assume responsibility for items that are lost in transit back to us.

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Online or in-store purchases can be returned to any of our 12 stores free of charge or can be returned by post or courier at your cost after completing the online returns form below. If you are returning an item due to a fault, we will refund your postage costs.

Bikes & Bulky items

If you wish to return a bike or bulky item to us, please keep the box it arrived in and let us know by contacting our support team via our online webchat, email or by phone (020 45063856) and we will help arrange a collection.

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If you wish to return or exchange an item, please fill out the form below following the steps inside. Returns can be processed quicker if all required information is provided.




Terms & Conditions

Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

Trek Farley 5 Fat Bike 2026 in Blue Sage to Lithium Grey Fade

Season:2026

Brand:Trek

Code:37018GRN

The Farley 5 is the ultimate go-anywhere fat bike.

Arctic tundra? Farley's game. Sandy desert singletrack? Farley's lofty tyres will keep you afloat. A winter bikepacking mission through rugged terrain? Sounds like a walk in the park. The Farley's all-new geometry is more capable than ever with a slacker head tube angle for more stability and a steeper seat tube angle for pedalling efficiency and comfortable reach. Up front, its carbon fork is loaded with a variety 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 customise 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 tyres will keep you floating over snow, sand, mud and dirt,
The new 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.

Key Features and Benefits:

  • Alpha Platinum alloy frame:Lightweight & Durable.
  • Bontrager Gnarwhal 27.5x4.5" tyres:Built for snow but excellent in mud too.
  • Dropper seatpost:For increased control on steep descents.

Full Specification:

  • Frame:Alpha Platinum Aluminium, tapered head tube, internal derailleur & dropper post routing, rack mounts, 197x12 mm adjustable horizontal sliding dropouts
  • Fork: Farley carbon, tapered alloy steerer, crown rack mounts, lower leg cage mounts, 150x15 mm thru axle
  • Number of Gears:10
  • Gear Shifters: microSHIFT Advent X SL-M9605, 10-speed
  • Chainset: FSA Comet, 30T, 170 mm length (XL 175)
  • Chainrings:28T Steel ring
  • Rear Cassette: microSHIFT Advent X, 11-48, 10-speed
  • Chain:KMC X10, 10-speed
  • Front Derailleur:N/A
  • Rear Derailleur:Shimano Deore M5120, long cage
  • Bottom Bracket: FSA BB-7100, 100mm, BSA threaded
  • Pedals:VP-536 nylon platform
  • Rims:SUNRingle Mulefut 80 SL, 32-hole cutout
  • Front Hub:Bontrager alloy, sealed bearing, 6-bolt disc, 150x15 mm thru axle
  • Rear Hub:Bontrager alloy, sealed bearing, 6-bolt, 108T Rapid Drive, Shimano 10 freehub, 197x12 mm thru axle
  • Front Tyre:Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x4.50'"
  • Rear Tyre:Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x4.50'"
  • Brakes:SRAM Level hydraulic disc, Avid G2 CleanSweep, 6-bolt, 160 mm
  • Handlebars:Bontrager alloy, 31.8mm, 15mm rise
  • Handlebar Grips:Bontrager XR Trail Comp, nylon lock-on
  • Headset:Semi-integrated, cartridge bearing, 1-1/8" top, 1.5" botto
  • Stem:Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree
  • Saddle:Bontrager Arvada, steel rails
  • Seatpost:TranzX JD-YSP18, internal routing, 31.6mm
  • Accessories:N/A
  • Weight: M - 16.20 kg / 35.72 lbs (with tubes)
Manufacturers reserve the right to change specifications without notice based on availability at the point of assembly.

Sizing Chart for Trek Farley

Frame SizeRider Height (cm)Rider Height (')Inseam (cm)Inseam (")
S155 – 1655’1″ – 5’5″74 - 7829 - 31
M165 - 1765’5″ – 5’9”79 - 8331 - 33
L177 – 1885’10” – 6’2″84 - 8933 - 35
XL188 – 1956’2” – 6’5″89 - 9135 - 36

Geometry for Trek Farley

Frame size number15.5"17.5"19.5"21.5"
Frame size letterSMLXL
Wheel size27.5"27.5"27.5"27.5"
A — Seat tube39.441.94752.1
B — Seat tube angle71.5°71.5°71.5°71.5°
Effective seat tube angle73.0°73.0°73.0°73.0°
C — Head tube length10101212
D — Head angle69.0°69.0°69.0°69.0°
E — Effective top tube56.759.463.164.4
F — Bottom bracket height32.132.132.132.1
G — Bottom bracket drop6.76.76.76.7
H — Chainstay length45.545.545.545.5
I — Offset5.15.15.15.1
J — Trail9.49.49.49.4
K — Wheelbase109.2111.9115.8117.1
L — Standover76.375.777.677.4
M — Frame reach38.34144.145.4
N — Frame stack60.160.161.961.9

Warranty Information for Trek:

Lifetime warranty on Frame sets (frame and rigid fork), main frame and full suspension swing arms for the lifetime of the original owner, and Bontrager wheels with carbon rims.

2-year warranty on Rear suspension linkage components, including bearings, rocker link and accompanying hardware and components, Bontrager wheels with alloy rims, Paint and transfers.

For full warranty policy please visit trekbikes.com

Technical Information
  • Frame
    Alpha Platinum Aluminium, tapered head tube, top tube bag mounts, strapless full frame bag mounts, downtube mudguard mount, lower downtube accessory mount, seat stay rear rack mounts, internal rear derailleur and dropper post routing, threaded BB, UDH, 197x12 mm
  • Fork
    Farley carbon, tapered alloy steerer, crown rack mounts, lower leg cage mounts, 150x15 mm thru axle
  • Max compatible fork travel
    80mm (492mm axle-to-crown)
  • Hub front
    Bontrager alloy, sealed bearing, 6-bolt disc, 150x15 mm thru axle
  • Skewer front
    Bontrager Switch thru-axle, removable lever
  • Hub rear
    Bontrager alloy, sealed bearing, 6-bolt, Rapid Drive 108, Shimano 10 freehub, 197x12 mm thru axle
  • Skewer rear
    Bontrager Switch thru-axle, removable lever
  • Rim
    SUNRingle Mulefut 80 SL, 32-hole cutout
  • Tyre
    Bontrager Gnarwhal Team Issue, Tubeless Ready, Inner Strength sidewalls, studdable, aramid bead, 120 tpi, 27.5x4.50'"'
  • Max tyre size
    27.5x4.50"
  • Shifter
    microSHIFT Advent X SL-M9605, 10-speed
  • Rear derailleur
    microSHIFT Advent X RD-M6205AM, 48T max cog
  • *Crank
    Size: S, M, L - FSA Comet, 30T, 170 mm length
    Size: XL - FSA Comet, 30T, 175 mm length
  • Bottom bracket
    FSA BB-7100, 100 mm, BSA threaded
  • Cassette
    microSHIFT Advent X, 11-48, 10-speed
  • Chain
    KMC X10, 10-speed
  • Pedal
    VP-536 nylon platform
  • Max. chainring size
    1x: 32T
  • Saddle
    Bontrager Verse P3, steel rails
  • *Seatpost
    Size: S - TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm, 361 mm length
    Size: M - TranzX JD-YSP18, 130mm travel, internal routing, 31.6 mm, 425 mm length
    Size: L, XL - TranzX JD-YSP18, 150 mm travel, internal routing, 31.6 mm, 470 mm length
  • Handlebar
    Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width
  • Grips
    Bontrager XR Trail Comp, nylon lock-on
  • *Stem
    Size: S - Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length
    Size: M - Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 60 mm length
    Size: L, XL - Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length
  • Head set
    FSA IS-2, 1-1/8" top, 1.5" bottom
  • Brake
    SRAM Level hydraulic disc
  • Brake rotor
    Avid G2 CleanSweep, 6-bolt, 160 mm
  • Brake Set
    SRAM Level hydraulic disc
  • Rotor size
    Max brake rotor sizes: 180mm front & rear
  • Weight
    M - 16.20 kg / 35.72 lbs (with tubes)
  • Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
Sizing Information
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