Trek Marlin 6 Gen 3

Name: Trek Marlin 6 Gen 3
Brand: Trek

2025 MountainCross-country Manufacturer page

Last known price: $999

Prices shown first for United States
Fork travel: 80 mm
Wheels: 27.5″, 29″
Drivetrain: 1 × 10 30t / 11–48t
Gear range: 436%
Weight: 14.5 kg 32.0 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

14.5"
15.5"
17.5"
18.5"
19.5"
21.5"

The manufacturer did not publish rider heights for these sizes.

Components

19 of 21 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

Frameset Marlin, Alpha Silver Aluminum, curved top tube, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew - XXS , XS : Alpha Silver Aluminum, curved top tube, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew; S , M , ML , L , XL , XXL : Alpha Silver Aluminum, internal derailleur & dropper post routing, rack and kickstand mount, 135x5mm ThruSkew Not identified

Suspension

1 part

Fork
- RockShox Judy

Drivetrain

6 parts

Bottom bracket
- FSA
Cassette
- Shimano CS-LG300-10 10 speeds
CS-LG300-10
Chain
- Shimano CN-LG500
CN-LG500
Crankset
- FSA 30t
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues SL-U6000
SL-U6000

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

7 parts

Grips
- Bontrager
Handlebar
- Bontrager
Headset

Semi-integrated, 1-1/8'' Not identified
Pedals
- VP
VP-536
Saddle
- Bontrager
Seatpost
- Bontrager
Stem
- Bontrager

Sizes and geometry

6 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 17.5"

Table

Reach 440mm

Stack 609mm

Wheelbase 1163mm

Head angle 66.5°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	390	415	440	455	470	495
Stackmm	563	572	609	614	618	637
Top tube lengthmm	551	579	615	631	647	678
Seat tube lengthmm	340	370	420	435	450	500
Head tube lengthmm	90	100	105	110	115	135
Head tube angle	66.5°	66.5°	66.5°	66.5°	66.5°	66.5°
Seat tube angle	74°	74°	74°	74°	74°	74°
Chainstay lengthmm	433	433	438	438	438	438
Wheelbasemm	1092	1121	1163	1180	1197	1230
Front centermm	663	692	732	749	765	798
Bottom bracket dropmm	45	45	60	60	60	60
Bottom bracket heightmm	310	310	314	314	314	314
Standover heightmm	658	692	747	759	771	791
Fork rakemm	42	42	46	46	46	46
Trailmm	110	110	110	110	110	110
Stack/reach ratio	1.44	1.38	1.38	1.35	1.32	1.29

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 14.5 kg

32.0 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Hardtail
Front travel: 80 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 48
Lowest gear: 18.1 in
Highest gear: 79.1 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Coil
Tire clearance: Maximum tire width: 2.4″
Tire width: 2.35″
Wheel material: Aluminum
Wheel size: 27.5″, 29″

Technical analysis

2 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

80 mm

This value is below the central range for this class.

Cohort: Mountain / Cross-country Model year: 2025
Sample: 1,507 bicycles with this information
Coverage: 87.8% of the class

Shifting

Mechanical

222 of 1,647 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2025
Sample: 1,647 bicycles with this information
Coverage: 95.9% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.9 km/h
Highest gear: 30.3 km/h

Total gear range 436%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 18.1–79.1 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds
Specification	This bicycle Trek Marlin 6 Gen 3	Trek Marlin 4 Gen 2	Trek Marlin 5 Gen 3	Trek Marlin 7 Gen 3
Frame
Bicycle weight	14.5 kg	14.6 kg	15.1 kg	15.03 kg
Drivetrain
Front chainrings	1	2	1	1
Smallest chainring	30	22	30	30
Largest chainring	30	36	30	30
Rear sprockets	10	7	9	12
Smallest sprocket	11	14	11	11
Largest sprocket	48	34	46	50
Lowest gear	18.1 in	18.8 in	18.9 in	17.4 in
Highest gear	79.1 in	74.6 in	79.1 in	79.1 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Hydraulic disc	Hydraulic disc
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost
Other specifications
Fork spring	Coil	Coil	Coil	Air
Tire clearance	Maximum tire width: 2.4″	Maximum tire width: 2.2″	Maximum tire width: 2.4″	Maximum tire width: 2.4″
Tire width	2.35″	2.2″	2.4″	2.4″