Marlin

The world's favorite Trek

Zipping through town, dipping your toes into the trail for the first time, or slicing through switchbacks, no matter where you roll, Marlin is a confidence-inspiring hardtail that’s ready for anything. With versatile trail geometry and Smart Wheel Sizing, this hardtail MTB is built to tackle everything. There’s a good reason it’s the world’s favorite Trek.

• Wheel Size: Smart Wheel Size
• Front Suspension: 100mm

Marlin 6 Gen 3

• Frame: Alpha Silver Aluminum
• Fork: RockShox Judy, 100mm
• Wheels: Bontrager Kovee

Marlin 6 is the perfect ride for progressing your skills on the trails. Its updated slacker frame geometry makes it easier to control on descents while the suspension fork takes the edge off bumpy trails. Integrated rack and kickstand mounts make it easy to add accessories to this versatile steed.

Will my bike have a curved top tube?

Smaller frames have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. Larger frame sizes have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Fit for every rider

Marlin comes in seven frame sizes to suit riders of any height, and Smart Wheel Size ensures you’re on the fastest wheel that fits. The smallest sizes even come with short-reach brake levers and narrower handlebars that give smaller riders better comfort and control.

High tech, high value

Marlin looks and feels great. It’s packed with features usually found only on more expensive bikes, like a stylish frame with internal shift cable and brake hose routing, which can help your cables last longer by protecting them from the elements.

Shimano CUES

Inspired by rider demand for trouble-free drivetrain longevity and performance, Shimano CUES offers a new foundation for versatility and durability across a range of both electric and standard bikes. CUES features Shimano’s new LINKGLIDE drivetrain technology for significantly increased life on wear items like chain, cassette, and chainrings.

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.

Shimano LINKGLIDE

LINKGLIDE technology has been specifically engineered for incredible durability while still delivering smooth and decisive shifting – along with a great pedalling experience. Available exclusively on Shimano CUES drivetrains.

Upgrade your pedals and love your bike more

Pedals are two of the five touchpoints that connect you with your bike, and even though this bike comes with a pair, upgrading to pedals that boost control and grip will greatly improve your ride. See the pedal guide and find the best pedals for your riding style. We recommend flat pedals for simple versatility.

Specs

Frameset

• *Frame:
  • Size: XS
  • Alpha Silver Aluminum, curved top tube, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew
  • Size: S , M , ML , L , XL
  • Alpha Silver Aluminum, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew
• *Fork:
  • Size: XS , S
  • RockShox Judy, coil spring, preload, TurnKey lockout, 42mm offset for 27.5'' wheel, 100mm QR, 100mm travel
  • Size: M , ML , L , XL
  • RockShox Judy, coil spring, preload, TurnKey lockout, 46mm offset for 29'' wheel, 100mm QR, 100mm travel

Wheels:

• Hub front: Formula DC-20, alloy, 6-bolt, 100mm
• Hub rear: Formula DC-22, alloy, 6-bolt, Shimano 8/9/10 freehub, 135x5mm
• Skewer rear: 173x5mm QR
• *Rim:
  • Size: XS , S , M , ML , L , XL
  • Bontrager Kovee, double-wall, Tubeless Ready, 28-hole, 23mm width, Presta valve
  • Size: M , ML , L , XL
  • Bontrager Kovee, double-wall, Tubeless Ready, 32-hole, 23mm width, Presta valve
• *Tire:
  • Size: XS , S
  • Maxxis IKON, tubeless ready, EXO casing, folding bead, 60tpi, 27.5x2.35''
  • Size: M , ML , L , XL
  • Maxxis Rekon Race, tubeless ready, EXO casing, folding bead, 60tpi, 29x2.35''
• Rim strip: Bontrager TLR

Drivetrain:

• Shifter: Shimano U6000, 10 speed
• Rear derailleur: Shimano CUES U6000 GS
• *Crank:
  • Size: XS , S , M , ML
  • Shimano U4000, 30T chainring, 170mm length
  • Size: L , XL
  • Shimano U4000, 30T chainring, 175mm length
• Bottom bracket: Shimano, 73mm, threaded cartridge, 122.5mm spindle
• Cassette: Shimano CUES LG300, LINKGLIDE, 11-48, 10 speed
• Chain: Shimano LG500, 9/10/11 speed
• Pedal: VP-536 nylon platform

Components:

• Saddle: Bontrager Verse Short, stainless steel rails
• *Seatpost:
  • Size: XS , S
  • TranzX JD-YSI34, 100mm travel, internal routing, 31.6mm, 350mm length
  • Size: M
  • TranzX JD-YSI34, 125mm travel, internal routing, 31.6mm, 405mm length
  • Size: ML , L , XL
  • TranzX JD-YSI34, 150mm travel, internal routing, 31.6mm, 456mm length
• *Handlebar:
  • Size: XS
  • Bontrager alloy, 31.8mm, 5mm rise, 690mm width
  • Size: S
  • Bontrager alloy, 31.8mm, 15mm rise, 720mm width
  • Size: M , ML , L , XL
  • Bontrager alloy, 31.8mm, 15mm rise, 750mm width
• Grips: Trek Line Comp, nylon lock-on
• *Stem:
  • Size: XS , S
  • Bontrager Comp, 31.8mm, 7 degree, 35mm length
  • Size: M , ML , L
  • Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 50mm length
  • Size: XL
  • Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 60mm length
• Headset: Semi-integrated, 1-1/8''
• Brake: Shimano MT200 hydraulic disc
• *Brake Rotor:
  • Size: XS , S , M , ML , L , XL
  • Shimano RT26, 6-bolt, 160mm
  • Size: M , ML , L , XL
  • Shimano RT26, 6-bolt, 180mm
• Brake Set: Shimano MT200 hydraulic disc

Weight:

• Weight: M - 15.00 kg / 33.07 lbs
• Weight limit: This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).

Sizing

How tall are you?

To measure your height, stand straight up, barefoot, with your back, heels, shoulders and head all touching a wall. While looking straight ahead, place a book or straight edge on your head and slowly push it against the wall. Your straight edge should be parallel with the floor. Mark the spot where the bottom of the book is touching the wall. The distance from the marked spot to the floor is your height.

What is your inseam?

How to measure: Stand barefoot with your back straight and against a wall. Tuck a ruler or something that extends to the floor between your legs. Using both hands, and keeping it level, pull the ruler up into your crotch as if you were sitting on the saddle. Measure the distance from the top edge of the ruler to the ground to find your inseam measurement. Your inseam is very important to your final bike size so please measure carefully.

Sizing

Geometry

All measurements provided in cm unless otherwise noted.

Geometry diagram labeling frame measurements A through N. Each label corresponds to a row in the geometry table below.