Marin Coast Trail 20

2025 YouthMountain youth Manufacturer page

Last known price: $599

Prices shown first for United States
Suspension: Rigid
Wheels: 20″
Drivetrain: 1 × 7 34t / 11–34t
Gear range: 309%
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

7 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

Series 1 Lightweight Aluminum, Low Standover, 20” Wheels, Replaceable Derailleur Hanger, Rim Brake Not identified

Suspension

1 part

Fork

Series 1 Aluminum, Rim brake Not identified

Drivetrain

6 parts

Bottom bracket

Sealed Cartridge Bearings, Square Taper Not identified
Cassette
- SunRace 11–34t
Chain
- KMC
Crankset

Forged Alloy, 34T, 140mm, Ring Guard Not identified
Rear derailleur
- Shimano Tourney
Shifters
- microSHIFT

Brakes

2 parts

Brake levers

Kid's Specific Short Reach Alloy Lever Not identified
Brakes

Linear Pull, Alloy Not identified

Wheels and tires

5 parts

Front hub

Forged Aluminum Alloy, 28H Not identified
Rear hub

Forged Aluminum Alloy, 28H Not identified
Rims

Aluminum, CNC Brake Surface Not identified
Spokes

14g Stainless Steel Not identified
Tires
- Marin

Cockpit and contact points

7 parts

Grips

Single Density, Thin Diameter Grip Not identified
Handlebar
- Marin
Headset

Threadless Not identified
Pedals

Kids Specific Nylon Pedal Not identified
Saddle
- Marin
Seatpost

Aluminum, 27.2mm, Integrated Saddle/Post Not identified
Stem

Alloy, 40mm Not identified

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 One

Table

Reach 299mm

Stack 407mm

Wheelbase 839mm

Head angle 69.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 20″ 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
Frame
Reachmm	299
Stackmm	407
Top tube lengthmm	424
Seat tube lengthmm	280
Head tube lengthmm	100
Head tube angle	69°
Seat tube angle	73°
Chainstay lengthmm	355
Wheelbasemm	839
Front centermm	486
Bottom bracket dropmm	30
Bottom bracket heightmm	227
Standover heightmm	450
Fork rakemm	40
Stack/reach ratio	1.36
Suspension and parts
Crank lengthmm	130
Handlebar widthmm	580
Stem lengthmm	60

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

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Aluminum

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 34
Largest chainring: 34
Rear sprockets: 7
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 20.0 in
Highest gear: 61.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2″
Wheel material: Aluminum
Wheel size: 20″

Technical analysis

3 measures

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

Lowest gear

20.0 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 257 bicycles with this information
Coverage: 70.0% of the class

Highest gear

61.8 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 257 bicycles with this information
Coverage: 70.0% of the class

Shifting

Mechanical

10 of 367 bicycles with this information use electronic shifting.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 367 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.7 km/h
Highest gear: 23.7 km/h

Total gear range 309%

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: 20.0–61.8 gear inches
Class reference (p10–p90): 14.0–80.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2025
Lowest gear: 257 bicycles with this information, 70.0% of the class
Highest gear: 257 bicycles with this information, 70.0% 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 2025 builds

Differences across 2025 builds
Specification	This bicycle Marin Coast Trail 20	Marin Coast Trail 16	Marin Coast Trail 20" 1	Marin Coast Trail 20" 7	Marin Coast Trail 24
Drivetrain
Smallest chainring	34	26	34	34	36
Largest chainring	34	26	34	34	36
Rear sprockets	7	1	1	7	8
Smallest sprocket	11	20	16	11	11
Largest sprocket	34	20	16	34	34
Lowest gear	20.0 in	20.8 in	42.5 in	20.0 in	25.4 in
Highest gear	61.8 in	20.8 in	42.5 in	61.8 in	78.6 in
Cockpit
Shifting	Mechanical	No shifting	No shifting	Mechanical	Mechanical
Other specifications
Wheel size	20″	16″	20″	20″	24″