Trek Marlin 7 Gen 3

Name: Trek Marlin 7 Gen 3
Brand: Trek

2026 MountainCross-country Manufacturer page

Last known price: $1,399

Prices shown first for United States
Fork travel: 100 mm
Wheels: 27.5″, 29″
Drivetrain: 1 × 12 30t / 11–50t
Gear range: 455%
Weight: 14.15 kg 31.2 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

14.5" 145–156
15.5" 154–166
17.5" 164–177
18.5" 173–180
19.5" 177–189
21.5" 187–196
23" 194–203

Components

18 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 - 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

Brakes

2 parts

Brakes
- Shimano BR-MT200
BR-MT200
Disc rotors
- Shimano SM-RT26
SM-RT26

Wheels and tires

4 parts

Cockpit and contact points

7 parts

Grips
- Trek
Handlebar
- Bontrager
Headset

Semi-integrated, 1-1/8'' Not identified
Pedals

Nylon platform Not identified
Saddle
- Bontrager
Seatpost
- Tranz-X
JD-YSI34
Stem
- Bontrager

Sizes and geometry

7 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 18.5"

Table

Reach 455mm

Stack 614mm

Wheelbase 1180mm

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 Reported by the manufacturer

Complete manufacturer geometry table 7 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	390	415	440	455	470	495	520
Stackmm	563	572	609	614	618	637	651
Top tube lengthmm	551	579	615	631	647	678	707
Seat tube lengthmm	340	370	420	435	450	500	540
Head tube lengthmm	90	100	105	110	115	135	150
Head tube angle	66.5°	66.5°	66.5°	66.5°	66.5°	66.5°	66.5°
Seat tube angle	74°	74°	74°	74°	74°	74°	74°
Chainstay lengthmm	433	433	438	438	438	438	438
Wheelbasemm	1092	1121	1163	1180	1197	1230	1261
Front centermm	663	692	732	749	765	798	829
Bottom bracket dropmm	45	45	60	60	60	60	60
Bottom bracket heightmm	310	310	314	314	314	314	314
Standover heightmm	658	692	747	759	771	791	816
Fork rakemm	42	42	46	46	46	46	46
Trailmm	110	110	110	110	110	110	110
Stack/reach ratio	1.44	1.38	1.38	1.35	1.32	1.29	1.25

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: 14.15 kg

31.2 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Hardtail
Front travel: 100 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 17.4 in
Highest gear: 79.1 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire clearance: Maximum tire width: 2.4″
Tire width: 2.4″
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

100 mm

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2026
Sample: 1,209 bicycles with this information
Coverage: 90.0% of the class

Shifting

Mechanical

156 of 1,318 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2026
Sample: 1,318 bicycles with this information
Coverage: 98.2% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.7 km/h
Highest gear: 30.3 km/h

Total gear range 455%

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: 17.4–79.1 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 2026 builds
Specification	This bicycle Trek Marlin 7 Gen 3	Trek Marlin 4 Gen 3	Trek Marlin 5 Gen 3	Trek Marlin 6 Gen 3
Frame
Bicycle weight	14.15 kg	14.9 kg	15.1 kg	15 kg
Suspension
Front travel	100 mm	100 mm	80 mm	100 mm
Drivetrain
Smallest chainring	30	30	32	30
Largest chainring	30	30	32	30
Rear sprockets	12	8	9	10
Largest sprocket	50	45	46	48
Lowest gear	17.4 in	19.3 in	20.2 in	18.1 in
Highest gear	79.1 in	79.1 in	84.4 in	79.1 in
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost
Other specifications
Fork spring	Air	Coil	Coil	Coil
Wheel size	27.5″ / 29″	26″ / 27.5″ / 29″	27.5″ / 29″	27.5″ / 29″