Marin Bear Valley 20

2025 YouthGeneral youth Manufacturer page

Last known price: $699

Prices shown first for United States
Suspension: Rigid
Wheels: 20″
Drivetrain: 1 × 8 30t / 11–38t
Gear range: 345%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

8 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 2 Lightweight Aluminum MTB, Low Standover, 20” Wheels, Replaceable Derailleur Hanger, Disc Brake Not identified

Suspension

1 part

Fork

Series 2 Aluminum MTB, Disc Brake Not identified

Drivetrain

6 parts

Bottom bracket

Sealed Cartridge Bearings, Square Taper Not identified
Cassette
- microSHIFT Acolyte 11–38t
Chain
- KMC
Crankset

Forged Alloy, 30T, 115mm, Ring Guard Not identified
Rear derailleur
- microSHIFT Acolyte
Shifters
- microSHIFT Acolyte

Brakes

2 parts

Brake levers

Hydraulic Kid's Specific Short Reach Alloy Lever Not identified
Brakes
- Tektro HD-J285
HD-J285

Wheels and tires

5 parts

Front hub

Forged Aluminum Alloy, 28H Not identified
Rear hub

Forged Aluminum Alloy, 28H Not identified
Rims

Aluminum, Double Wall Not identified
Spokes

14g Stainless Steel Not identified
Tires
- Kenda Booster

Cockpit and contact points

7 parts

Grips

Single Densitiy, 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, 45mm 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 317mm

Stack 401mm

Wheelbase 892mm

Head angle 67.0°

Seat angle 75.0°

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	317
Stackmm	401
Top tube lengthmm	425
Seat tube lengthmm	280
Head tube lengthmm	100
Head tube angle	67°
Seat tube angle	75°
Chainstay lengthmm	375
Wheelbasemm	892
Front centermm	519
Bottom bracket dropmm	30
Bottom bracket heightmm	240
Standover heightmm	518
Fork rakemm	40
Stack/reach ratio	1.27
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: 30
Largest chainring: 30
Rear sprockets: 8
Smallest sprocket: 11
Largest sprocket: 38
Lowest gear: 15.8 in
Highest gear: 54.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 20″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.0 km/h
Highest gear: 20.9 km/h

Total gear range 345%

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: 15.8–54.6 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

Differences across 2025 builds
Specification	This bicycle Marin Bear Valley 20	Marin Bear Valley 24
Drivetrain
Smallest sprocket	11	12
Largest sprocket	38	42
Lowest gear	15.8 in	17.1 in
Highest gear	54.6 in	60.0 in
Other specifications
Tire width	2.4″	2.25″
Wheel size	20″	24″