Trek Marlin 4 Gen 2

Name: Trek Marlin 4 Gen 2
Brand: Trek

2025 MountainCross-country Manufacturer page

Last known price: $599

Prices shown first for United States
Fork travel: 80 mm
Wheels: 27.5″, 29″
Drivetrain: 2 × 7 22–36t / 14–34t
Gear range: 397%
Weight: 14.6 kg 32.2 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Mechanical disc

Sizes

Size guide

13.5"
15.5"
17.5"
18.5"
19.5"
21.5"

The manufacturer did not publish rider heights for these sizes.

Components

20 of 23 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

Alpha Silver Aluminum, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5mm QR - XS , S : Alpha Silver Aluminum, curved top tube, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5mm QR; ML , M , L , XL : Alpha Silver Aluminum, internal routing, chainstay disc brake mount, rack and kickstand mount, 135x5mm QR Not identified

Suspension

1 part

Fork
- SR Suntour XCE28

Drivetrain

7 parts

Bottom bracket
- VP VP-BC73
VP-BC73
Cassette
- Shimano Tourney TZ MF-TZ500
MF-TZ500
Chain
- KMC Z7 7 speeds
Crankset
- Prowheel 36/22t
TM-CY10
Front derailleur
- Shimano Altus FD-M315 2 speeds
FD-M315
Rear derailleur
- Shimano Tourney RD-TY300 7 speeds
RD-TY300
Shifters
- Shimano ST-EF500
ST-EF500ST-EF500-2L

Brakes

2 parts

Brakes
- Tektro MD-M280
MD-M280MD-M281
Disc rotors
- Tektro

Wheels and tires

5 parts

Front hub
- Formula DC-20
DC-20
Rear hub
- Formula
DC-31
Rims
- Bontrager
Spokes

14g stainless steel, black Not identified
Tires
- Bontrager

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 418mm

Stack 602mm

Wheelbase 1100mm

Head angle 69.5°

Seat angle 73.0°

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	376	385	418	434	451	466
Stackmm	565	574	602	602	611	630
Top tube lengthmm	544	555	602	618	638	659
Seat tube lengthmm	343	368	419	444	470	521
Head tube lengthmm	90	90	90	90	100	120
Head tube angle	69.3°	69.3°	69.5°	69.5°	69.5°	69.5°
Seat tube angle	73.5°	73.5°	73°	73°	73°	73°
Chainstay lengthmm	438	438	438	438	438	438
Wheelbasemm	1049	1066	1100	1116	1137	1159
Front centermm	618	632	668	684	705	727
Bottom bracket dropmm	58	48	58	58	58	58
Bottom bracket heightmm	297	307	316	316	316	316
Standover heightmm	658	686	748	758	757	769
Fork rakemm	44	44	42	42	42	42
Trailmm	88	88	93	93	93	93
Stack/reach ratio	1.50	1.49	1.44	1.39	1.36	1.35

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: 14.6 kg

32.2 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Hardtail
Front travel: 80 mm

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 22
Largest chainring: 36
Rear sprockets: 7
Smallest sprocket: 14
Largest sprocket: 34
Lowest gear: 18.8 in
Highest gear: 74.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Coil
Tire clearance: Maximum tire width: 2.2″
Tire width: 2.2″
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: 1,508 bicycles with this information
Coverage: 87.8% of the class

Shifting

Mechanical

222 of 1,648 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2025
Sample: 1,648 bicycles with this information
Coverage: 95.9% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.2 km/h
Highest gear: 28.6 km/h

Total gear range 397%

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: 18.8–74.6 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 4 Gen 2	Trek Marlin 5 Gen 3	Trek Marlin 6 Gen 3	Trek Marlin 7 Gen 3
Frame
Bicycle weight	14.6 kg	15.1 kg	14.5 kg	15.03 kg
Drivetrain
Front chainrings	2	1	1	1
Smallest chainring	22	30	30	30
Largest chainring	36	30	30	30
Rear sprockets	7	9	10	12
Smallest sprocket	14	11	11	11
Largest sprocket	34	46	48	50
Lowest gear	18.8 in	18.9 in	18.1 in	17.4 in
Highest gear	74.6 in	79.1 in	79.1 in	79.1 in
Brakes
Brake type	Mechanical disc	Hydraulic 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: 2.2″	Maximum tire width: 2.4″	Maximum tire width: 2.4″	Maximum tire width: 2.4″
Tire width	2.2″	2.4″	2.35″	2.4″