Trek Marlin 4

Name: Trek Marlin 4
Brand: Trek

2021 MountainCross-country Manufacturer page

Fork travel: 75 mm
Wheels: 29″
Drivetrain: 3 × 7 24–42t / 14–28t
Gear range: 350%
Weight: 14.1 kg 31.1 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Mechanical disc

Sizes

Size guide

18.5"

The manufacturer did not publish rider heights for these sizes.

Components

18 of 22 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 Aluminium w/semi-integrated head tube, rack and mudguard mounts, G2 Geometry on 29ers Not identified

Suspension

1 part

Fork
- SR Suntour
M-3030

Drivetrain

7 parts

Bottom bracket

Sealed cartridge Not identified
Cassette
- Shimano MF-TZ21
MF-TZ21
Chain
- KMC
Crankset
- Shimano FC-TY301 8 speeds 42/34/24t
FC-TY301
Front derailleur
- Shimano Tourney FD-TY500
FD-TY500
Rear derailleur
- Shimano Tourney RD-TY300 7 speeds
RD-TY300
Shifters
- Shimano ST-EF500
ST-EF500

Brakes

1 part

Brakes
- Tektro MD-M280
MD-M280

Wheels and tires

5 parts

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

Size: XS, S, M, ML, L, XL, XXL, 14g, stainless; Size: M, 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
- Wellgo
Saddle
- Bontrager
Seatpost
- Bontrager
Stem
- Bontrager

Sizes and geometry

1 size Open in the geometry plotter

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

Size 18.5"

Table

Reach 434mm

Stack 602mm

Wheelbase 1116mm

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 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	434
Stackmm	602
Top tube lengthmm	618
Seat tube lengthmm	444
Head tube lengthmm	90
Head tube angle	69.5°
Seat tube angle	73°
Chainstay lengthmm	438
Wheelbasemm	1116
Front centermm	684
Bottom bracket dropmm	58
Bottom bracket heightmm	310
Standover heightmm	758
Fork rakemm	42
Trailmm	93
Stack/reach ratio	1.39

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: 14.1 kg

31.1 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Hardtail
Front travel: 75 mm

Drivetrain

Derived by Bikelake

Front chainrings: 3
Smallest chainring: 24
Largest chainring: 42
Rear sprockets: 7
Smallest sprocket: 14
Largest sprocket: 28
Lowest gear: 24.9 in
Highest gear: 87.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Coil
Tire clearance: Maximum tire width: 2.2″
Tire width: 2.2″
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

4 measures

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

Front travel

75 mm

This value is below the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,256 bicycles with this information
Coverage: 91.6% of the class

Lowest gear

24.9 gear inches

This value is above the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,101 bicycles with this information
Coverage: 80.3% of the class

Highest gear

87.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,101 bicycles with this information
Coverage: 80.3% of the class

Shifting

Mechanical

89 of 1,368 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,368 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 9.5 km/h
Highest gear: 33.3 km/h

Total gear range 350%

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: 24.9–87.0 gear inches
Class reference (p10–p90): 17.4–100.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Cross-country Model year: 2021
Lowest gear: 1101 bicycles with this information, 80.3% of the class
Highest gear: 1101 bicycles with this information, 80.3% of the class

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 2021 builds
Specification	This bicycle Trek Marlin 4	Trek Marlin 5	Trek Marlin 5 Women's	Trek Marlin 6	Trek Marlin 6 Women's	Trek Marlin 7
Frame
Intended fit	Unisex	Unisex	womens	Unisex	womens	Unisex
Bicycle weight	14.1 kg	14.44 kg	14.01 kg	14.5 kg	14.37 kg	13.77 kg
Suspension
Front travel	75 mm	100 mm	100 mm	100 mm	100 mm	100 mm
Drivetrain
Front chainrings	3	3	3	2	2	1
Smallest chainring	24	24	24	22	22	28
Largest chainring	42	42	42	36	36	28
Rear sprockets	7	7	7	8	8	10
Smallest sprocket	14	12	12	11	11	11
Largest sprocket	28	32	32	34	34	46
Lowest gear	24.9 in	21.8 in	21.8 in	18.8 in	18.8 in	17.7 in
Highest gear	87.0 in	101.5 in	101.5 in	94.9 in	94.9 in	73.8 in
Brakes
Brake type	Mechanical disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc
Other specifications
Tire width	2.2″	2″	2″	2.2″	2.2″	2.2″
Wheel size	29″	27.5″ / 29″	27.5″ / 29″	29″	29″	27.5″ / 29″
Bottom bracket standard	Not informed	BSA	BSA	BSA	BSA	BSA

Changes since 2020
Specification	2020 Trek Marlin 4	This bicycle Trek Marlin 4
Frame
Bicycle weight	14.5 kg	14.1 kg
Suspension
Front travel	100 mm	75 mm
Other specifications
Bottom bracket standard	BSA	Not informed
Tire width	2″	2.2″
Wheel size	27.5″ / 29″	29″