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Trek Marlin 4 Gen 3 is a versatile hardtail mountain bike with Shimano 8-speed, suspension fork, and hydraulic discs — ideal for trails and daily commuting.
Trek Marlin 4 Gen 3 is a versatile hardtail mountain bike with Shimano 8-speed, suspension fork, and hydraulic discs — ideal for trails and daily commuting.
Trek

Trek Marlin 4 Gen 3 Hardtail Mountain Bike 2026 in Blue Sage

£525.00
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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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Hassle free returns

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.




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 Marlin 4 Gen 3 Hardtail Mountain Bike 2026 in Blue Sage

Season:2026

Brand:Trek

Code:57361GN

Marlin 4 is a trail-worthy daily rider that's perfectly suited for everyday adventures, on and off the trail. It features a trail-savvy frame with a suspension fork, 8-speed Shimano ESSA shifting and mounts for a rack and kickstand that make it an ideal choice for trail riders or anyone looking for a comfortable, stable commuter with the ruggedness of a real mountain bike.

XS frames have a curved top tube, to ease mounting and dismounting.

Key Features & Benefits:

  • SR Suntour suspension fork:For comfort and control.
  • Hydraulic disc brakes:For reliable stopping in all conditions.
  • Shimano 8-speed gears:Wide range gearing, with the simplicity of a single shifter.

Full Specification:

  • Frame: Size: XS - Alpha Silver Aluminium, curved top tube, internal derailleur and dropper post routing, rack and kickstand mount, 135x5 mm ThruSkew Size: S , M , ML , L , XL , XXL - Alpha Silver Aluminium, internal derailleur and dropper post routing, rack and kickstand mount, 135x5 mm ThruSkew
  • Fork: Size:XS - SR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5"" wheel, 100 mm QR, 80 mm travel Size: S - SR Suntour XCE 28, coil spring, preload, 42 mm offset for 27.5"" wheel, 100 mm QR, 100 mm travel Size: M , ML , L , XL , XXL - SR Suntour XCE 28, coil spring, preload, 46 mm offset for 29"" wheel, 100 mm QR, 100 mm travel
  • Number of Gears: 8
  • Gear Shifters: Shimano M315, 8-speed
  • Chainset: Size:XS - ProWheel alloy, 32T narrow-wide steel ring, 160mm length Size:S , M , ML - ProWheel alloy, 32T narrow-wide steel ring, 170mm length Size:L , XL , XXL - ProWheel alloy, 32T narrow-wide steel ring, 175mm length
  • Chainrings: 32T
  • Rear Cassette: Shimano HG300, 11-45, 8-speed
  • Chain: KMC Z8.3, 8-speed
  • Rear Derailleur: Shimano ESSA U2000
  • Pedals: nylon platform
  • Rims: Bontrager Connection, double-wall, 32-hole, 20 mm width, Schrader valve
  • Front Hub: Formula DC-20, alloy, 6-bolt, 5x100 mm QR
  • Rear Hub: Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135x5 mm QR
  • Front Tyre: Size:XS , S - Bontrager Montrose comp, wire bead, 30 tpi, 27.5x2.40" / Size:M , ML , L , XL , XXL - Bontrager Montrose comp, wire bead, 30 tpi, 29x2.40"
  • Rear Tyre: Size:XS , S - Bontrager Montrose comp, wire bead, 30 tpi, 27.5x2.40" / Size:M , ML , L , XL , XXL - Bontrager Montrose comp, wire bead, 30 tpi, 29x2.40"
  • Brakes: Size:XS , S - Tektro HD-M276 hydraulic disc / Size:M , ML , L , XL , XXL - Tektro HD-M275 hydraulic disc
  • Handlebars: Size:XS - Bontrager alloy, 31.8 mm, 5 mm rise, 690 mm width / Size:S - Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width / Size:M , ML , L , XL , XXL - Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width
  • Handlebar Grips: Trek Line Comp, nylon lock-on
  • Headset: Semi-integrated, 1-1/8''
  • Stem: Size:XS , S - Bontrager Comp, 31.8 mm, 7-degree, 35 mm length / Size:M , ML , L - Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 50 mm length / Size:XL - Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 60 mm length / Size:XXL - Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length
  • Saddle: Bontrager Verse Short, stainless steel rails
  • Seatpost: Size:XS , S , M - Bontrager alloy, 31.6 mm, 12 mm offset, 330 mm length / Size:ML , L , XL , XXL - Bontrager alloy, 31.6 mm, 12 mm offset, 400 mm length
  • Accessories: N/A
  • Weight: M - 14.90 kg / 32.85 lbs
Manufacturers reserve the right to change specifications without notice based on availability at the point of assembly.

Sizing Chart for Trek Marlin Gen 3 Hardtail Mountain Bike

The smaller frame sizes (XXS & XS) have a curved top tube and a lower standover height that makes it easier for smaller riders to mount and dismount, so you get a bike perfectly moulded to your size. XXS comes with 26" wheel, XS and S come with 27.5" wheel.
Frame SizeRider Height (cm)Rider Height (')Inseam (cm)Inseam (")
XXS135 - 1454'5" - 4'9"64 - 6825 - 27
XS145 - 1554'9" - 5'1"69 - 7327 - 29
S155 - 1655'1" - 5'5"74 - 7829 - 31
M165 - 1765'5" - 5'9"79 - 8331 - 33
M/L173 - 1805'8" - 5'11"81 - 8632 - 34
L177 - 1885'10" - 6'2"84 - 8934 - 35
XL188 - 1956'2" - 6'5"89 - 9135 - 36
XXL195 - 2036'5" - 6'8"91 - 9736 - 38

Geometry for Trek Marlin

Frame Size Number13.514.515.517.518.519.521.523
Frame Size LetterXXSXSSMMLLXLXXL
Wheel Size26"27.5"27.5"29"29"29"29"29"
A - Seat Tube3234374243.5455054
B - Seat Tube Angle74.0°73.8°73.8°73.4°73.4°73.4°73.4°73.4°
Effective Tube Angle74.0°74.0°74.0°74.0°74.0°74.0°74.0°74.0°
C - Head Tube Length991010.51111.513.515
D - Head Angle66.5°66.5°66.5°66.5°66.5°66.5°66.5°66.5°
E - Effective Top Tube52.155.157.961.563.164.767.870.7
F - Bottom Bracket Height30.231.331.330.830.830.830.830.8
G - Bottom Bracket Drop3.84.54.566666
H - Chainstay Length43.343.343.343.843.843.843.843.8
I - Offset44.24.24.64.64.64.64.6
J - Trail10.411111111111111
K - Wheelbase106109.2112.1116.3118119.7123126.1
L - Standover6565.869.274.775.977.179.181.6
M - Frame Reach36.53941.54445.54749.552
N - Frame Stack54.456.357.260.961.461.863.765.1

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

Sizing Information
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